CN114230042A

CN114230042A - Experiment platform and experiment method for recharging surface water serving as geothermal supplementary water

Info

Publication number: CN114230042A
Application number: CN202111552078.0A
Authority: CN
Inventors: 沈健; 林建旺; 赵艳婷; 赵苏民; 高新智; 宗振海; 张森; 殷肖肖; 杨宝美
Original assignee: TIANJIN GEOTHERMAL EXPLORATION AND DEVELOPMENT DESIGNING INSTITUTE
Current assignee: TIANJIN GEOTHERMAL EXPLORATION AND DEVELOPMENT DESIGNING INSTITUTE
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-03-25

Abstract

The invention discloses an experiment platform and an experiment method for recharging surface water as geothermal make-up water. The experimental platform consists of a coagulating sedimentation process, a coagulating filtration process, a chemical precipitation filtration ammonia nitrogen removal process, a biological ammonia nitrogen removal filtration process and a hardness and salt removal process. Different processes can be combined according to different raw water qualities and recharge water quality requirements, different treatment process experiments are carried out, different process treatment effects, operation stability and treatment cost are investigated, and finally a treatment process scheme with standard water quality and low treatment cost is obtained.

Description

Experiment platform and experiment method for recharging surface water serving as geothermal supplementary water

Technical Field

The invention relates to the technical field of surface water treatment, in particular to an experiment platform and an experiment method for recharging surface water as geothermal supplementary water.

Background

Geothermal resources are green energy, but during the exploitation and use of geothermal resources, geothermal water is lost, so that geothermal water is gradually reduced, and geothermal resources are gradually exhausted. In order to prevent the depletion of geothermal resources, geothermal water needs to be supplemented underground, so that the long-term stable application and exploitation of geothermal resources can be realized. The geothermal water supplemented to the underground can meet the standard of geothermal water recharge water to ensure the sustainability of recharge.

The difference of the water quality conditions of geothermal reinjection water replenishing water sources is large, the reinjection water quality requirements of different reinjection wells are different, different processes are needed for different water quality treatments, the existing experiment platform is only provided with one to two surface water treatment processes, different treatment process experiments cannot be carried out aiming at different surface water qualities, the treatment effects, the operation stability and the treatment cost of different processes are inspected, and finally, the treatment process with the standard water quality and the low treatment cost is obtained.

Disclosure of Invention

The invention aims to provide an experimental platform for recharging surface water as geothermal supplementary water, aiming at the problem that the experimental platform in the prior art can not provide different treatment processes aiming at different water qualities.

The invention also aims to provide an experimental method for recharging the surface water as the geothermal supplementary water.

The technical scheme adopted for realizing the purpose of the invention is as follows:

the utility model provides an experiment platform that surface water handled as geothermal make-up water recharge, includes former water pitcher, adds medicine jar group, coagulation jar, gunbarrel, BAF, pans, tubular membrane, sand filtration jar, oxygen-eliminating jar, microfiltration and product water pitcher, wherein:

along the rivers direction, the selective connection coagulation tank or the BAF of raw water output pipeline of former water pitcher, be equipped with the raw water pump on the raw water output pipeline, be connected with on the pipeline between former water pitcher and the coagulation tank and add medicine jar group, the selective connection gunbarrel or the pans of coagulation tank, BAF pass through the pipeline with the pans are connected, are equipped with the pipeline of optional intercommunication between gunbarrel and the pans, the selective connection sand filtration jar or the tubular membrane of pans, the pans with be equipped with the circulation pipeline between the tubular membrane, be equipped with the circulating pump on the circulation pipeline, the pans with be equipped with the elevator pump on the pipeline between the sand filtration jar, the selective connecting pipe formula membrane or the oxygen-eliminating jar of sand filtration jar, the oxygen-eliminating jar is connected to through precision filtration the product water pitcher, the tubular membrane connect to the product water pitcher.

In the above technical scheme, the dosing tank group comprises a bactericide tank, a coagulant tank, a magnesium salt tank, an alkali liquor tank and a sulfate tank.

In above-mentioned technical scheme, still including taking off hard desalination module, along the rivers direction, it includes that security personnel filter, receives filter membrane and washing jar in proper order to take off hard desalination module, security personnel's filterable water inlet with the delivery port of producing the water pitcher is linked together, be connected with water supply pump, reducing agent jar and antisludging agent jar on producing the pipeline between water pitcher and the security personnel's filtration, security personnel filter with receive the filter membrane through the pipe connection that is equipped with the high-pressure pump, the water purification delivery port of receiving the filter membrane pass through the pipeline with wash jar intercommunication.

In the technical scheme, the device further comprises a backwashing module and a cleaning module, the water production tank is connected with the sand filter tank, the tubular membrane and the deaerating tank through backwashing pipelines respectively, a backwashing pump is arranged on the backwashing pipeline, and the cleaning tank is connected to security filtration through a cleaning pipeline.

In the technical scheme, a raw water output pipeline is connected to a water outlet of the raw water tank, a first valve, a raw water pump and a dosing tank group are sequentially arranged on the raw water output pipeline along the water flow direction, each tank of the dosing tank group is connected to the raw water output pipeline through a dosing pipeline, and a dosing pump is arranged on each tank;

a water outlet of the raw water output pipeline is connected to a water inlet of the coagulation tank through a first pipeline and is connected to a water inlet of the BAF through a second pipeline, a second valve is arranged on the first pipeline, and a third valve is arranged on the second pipeline;

a water outlet of the coagulation tank is connected with a coagulation tank output pipeline, the coagulation tank output pipeline is connected with a water inlet of the sedimentation tank through a third pipeline, and the third pipeline is provided with a fourth valve; the output pipeline of the coagulation tank is connected with the water inlet of the intermediate tank through a fourth pipeline; a fifth valve is arranged on the fourth pipeline;

a BAF output pipeline is connected to a water outlet of the BAF, the BAF output pipeline is connected with a water inlet of the intermediate tank through a seventh pipeline, and the seventh pipeline is provided with a twenty-ninth valve;

the BAF is also connected with a blast pipeline, the blast pipeline is sequentially provided with a blower and a twenty-eighth valve along the airflow direction, a gas regulating pipeline is arranged between the twenty-eighth valve and the blower, and the gas regulating pipeline is provided with a twenty-seventh valve;

the water outlet of the settling tank is communicated with the intermediate tank through a fifth pipeline, preferably, the outlet of the fifth pipeline is connected to the fourth pipeline, the joint of the fifth pipeline and the fourth pipeline is positioned between the fifth valve and the water inlet of the intermediate tank, and the fifth pipeline is provided with a sixth valve;

the water outlet of the intermediate tank is connected with the water inlet of the tubular membrane through a first branch, the water outlet of the tubular membrane is connected with the water inlet of the intermediate tank through a second branch, the first branch and the second branch form a circulation pipeline between the intermediate tank and the tubular membrane, the intermediate tank, the first branch, the tubular membrane and the second branch are connected end to form a closed loop, a twelfth valve, a circulation pump and a thirteenth valve are sequentially arranged on the first branch along the water flow direction, a nineteenth valve is arranged on the second branch, the purified water outlet of the tubular membrane is connected with the water inlet of the water production tank through a tubular membrane water outlet pipe, and a seventeenth valve is arranged on the tubular membrane water outlet pipe;

a water port of the sand filter tank is connected with a sand filter tank connecting pipeline, and the sand filter tank connecting pipeline is connected with a connecting port of the first connecting valve;

a water outlet of the intermediate tank is connected with a third port of the first connecting valve through a sixth pipeline, and an eighth valve, a lift pump and a ninth valve are sequentially arranged on the sixth pipeline along the water flow direction;

a water port of the deaerating tank is connected with a deaerating tank connecting pipeline, and the deaerating tank connecting pipeline is connected with a second connecting valve;

a first port of the first connecting valve is connected to a third port of the second connecting valve through a ninth pipeline, a tenth valve is arranged on the ninth pipeline, a second port of the first connecting valve is connected to a water inlet of the tubular membrane through an eighth pipeline, and a fourteenth valve is arranged on the eighth pipeline;

the first port of the second connecting valve is connected to the precise filtering water inlet through a precise filtering connecting pipeline and is connected with the precise filtering water tank through a tenth pipeline, and an eleventh valve is arranged on the tenth pipeline;

the water outlet of the water production tank is connected with the water inlet of the security filter through an eleventh pipeline, a thirty-first valve, a water supply pump and a thirty-second valve are sequentially arranged on the eleventh pipeline along the water flow direction, the reducing agent tank and the scale inhibitor tank are sequentially connected onto the eleventh pipeline, a connecting port is positioned between the thirty-second valve and the water inlet of the security filter, preferably, the reducing agent tank and the scale inhibitor tank are respectively connected onto the eleventh pipeline through a dosing pipeline, and the reducing agent tank and the scale inhibitor tank are both provided with dosing pumps;

the water outlet of the security filtration is connected to the water inlet of the nanofiltration membrane through a twelfth pipeline, the twelfth pipeline is sequentially provided with a high-pressure pump and a thirty-third valve along the water flow direction, the concentrated water outlet of the nanofiltration membrane is connected with a concentrated water discharge pipeline, the concentrated water discharge pipeline is sequentially provided with a thirty-fourth valve and a thirty-sixth valve along the water flow direction, the concentrated water discharge pipeline is connected with a concentrated water detection pipe, preferably, a connecting port of the concentrated water detection pipe and the concentrated water discharge pipeline is positioned between the thirty-sixth valve and the thirty-fourth valve, and the concentrated water detection pipe is used for detecting the concentrated water of the nanofiltration membrane; and the purified water outlet of the nanofiltration membrane is connected to the cleaning tank through a first connecting pipe.

In another aspect of the invention, an experimental method for recharging surface water as geothermal supplementary water is provided,

step 1, water quality determination:

and 2, selecting any one or more of the following process methods to carry out experiments:

carrying out a coagulating sedimentation process: along the water flow direction, the raw water tank, the coagulation tank, the sedimentation tank, the intermediate tank, the sand filtration tank, the deaerating tank, the precise filtration tank and the water production tank are sequentially communicated, and the coagulant tank and the bactericide tank are started;

performing a coagulation filtration process: along the water flow direction, the raw water tank, the coagulation tank, the intermediate tank, the tubular membrane and the water production tank are sequentially communicated, and the coagulant tank and the bactericide tank are started;

the process for filtering and removing ammonia nitrogen by chemical reaction comprises the following steps: along the water flow direction, the raw water tank, the coagulation tank, the intermediate tank, the tubular membrane and the water production tank are sequentially communicated, and the magnesium salt tank, the alkali liquor tank and the sulfate tank are started;

performing a biochemical ammonia nitrogen removal filtering process: along the water flow direction, the raw water tank, the BAF, the intermediate tank, the sand filter tank, the tubular membrane and the water production tank are communicated in sequence;

and 3, analyzing the components of the treated water quality, accounting the cost, and selecting a process route with better treatment effect and lower operation cost.

In the above technical scheme, the coagulating sedimentation process, the coagulating filtration process, the chemical reaction filtration ammonia nitrogen removal process and the biochemical ammonia nitrogen removal filtration process can be performed in cooperation with a de-hardening desalting process, and the de-hardening desalting process is performed by: along the water flow direction, the water production tank, the security filter, the nanofiltration membrane and the cleaning tank are sequentially communicated, a reducing agent and a scale inhibitor are configured, the reducing agent and the scale inhibitor are added into the security filter through the reducing agent tank and the scale inhibitor tank, when the liquid level of the water production tank reaches a preset height, the water supply pump and the high-pressure pump are started, the operation parameters of the nanofiltration system are adjusted, and the clean water enters the cleaning tank to be stored until the produced water meets the requirements.

In the technical scheme, when the coagulating sedimentation process is carried out, along the water flow direction, a raw water tank, a coagulation tank, a sedimentation tank, an intermediate tank, a sand filter tank, a deaerating tank, precise filtration and a water production tank are sequentially communicated, a coagulant and a bactericide are configured, the coagulant and the bactericide are added into the coagulation tank through the bactericide tank and a coagulant tank, a raw water pump is started, a dosing pump and a stirrer on the coagulation tank are simultaneously started, sedimentation is completed in the sedimentation tank, when the liquid level of the intermediate tank reaches a preset height, a lift pump is started, the sand filter tank and the deaerating tank filter and deaerate water, the water enters the precise filtration and is precisely filtered again after being deaerated, the effluent enters the water production tank for storage, then backwashing is timed according to specific water quality, the dosing amount is adjusted according to the water quality and effluent condition in the operation process until the water quality and effluent meet requirements, and the backwashing pump is started during backwashing, water in the water production tank enters the sand filter tank and the deoxidizing tank for backwashing;

when the coagulation filtration process is carried out, along the water flow direction, a raw water tank, a coagulation tank, an intermediate tank, a tubular membrane and a water production tank are sequentially communicated, surface water to be treated is filled in the raw water tank, a coagulant and a bactericide are added into the coagulation tank through a bactericide tank and a coagulant tank, a raw water pump is started, a dosing pump and a stirrer on the coagulation tank are started simultaneously, when the liquid level of the intermediate tank reaches a preset height, a circulating pump on a circulating pipeline is started, the tubular membrane is repeatedly filtered, the dosing amount and the tubular membrane operation parameters are adjusted in the operation process according to the water quality condition of effluent, the effluent enters the water production tank for storage until the water quality of the effluent meets the requirement, a backwashing pump is started during backwashing, and the water in the water production tank enters the tubular membrane for backwashing;

when the ammonia nitrogen filtering process is carried out through chemical reaction, along the water flow direction, a raw water tank, a coagulation tank, an intermediate tank, a tubular membrane and a water production tank are sequentially communicated, sulfate, magnesium salt and alkali liquor are configured, a magnesium salt tank, an alkali liquor tank and a sulfate tank are started, the sulfate, the magnesium salt and the alkali liquor are added into the coagulation tank through the magnesium salt tank, the alkali liquor tank and the sulfate tank, a raw water pump is started, a dosing pump and a stirrer on the coagulation tank are started simultaneously, a circulating pump is started when the liquid level of the intermediate tank reaches the height, the tubular membrane is repeatedly filtered, the adding amount of an ammonia nitrogen removing agent is adjusted in the operation process according to the water quality condition of effluent water, the effluent water enters the water production tank for storage, a backwashing pump is started during backwashing, and the water in the water production tank enters the tubular membrane for backwashing;

when the biochemical ammonia nitrogen removal filtering process is carried out, the raw water tank, the BAF, the intermediate tank, the sand filter tank, the tubular membrane and the water production tank are sequentially communicated along the water flow direction, firstly, microorganisms in the BAF are cultured and domesticated, the bacterial state and the process parameters in the BAF are optimized, raw water firstly enters the BAF to biologically remove ammonia nitrogen, then enters the intermediate tank, water after ammonia nitrogen removal sequentially enters the sand filter tank and the tubular membrane to be filtered under the action of the lifting pump, effluent enters the water production tank to be stored, and during backwashing, the backwashing pump is started, and water in the water production tank enters the sand filter tank and the tubular membrane to be backwashed.

In the technical scheme, the step 2 further comprises a hardness removal and desalination process as a supplement process, the processes in the step 2 are matched for use, the water production tank, the security filter, the nanofiltration membrane and the cleaning tank are sequentially communicated along the water flow direction, the reducing agent and the scale inhibitor are configured, the reducing agent and the scale inhibitor are added into the security filter through the reducing agent tank and the scale inhibitor tank, when the liquid level of the water production tank reaches, the water supply pump and the high-pressure pump are started, the operation parameters of the nanofiltration system are adjusted, until the produced water meets the requirements, clean water enters the cleaning tank to be stored, and when cleaning is carried out, the water supply pump and the high-pressure pump are started, and water in the cleaning tank enters the security filter and the nanofiltration membrane to be cleaned through the cleaning pipeline.

In the technical scheme, when a coagulation sedimentation process is used, a first valve, a second valve, a fourth valve, a sixth valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a first connecting valve and a second connection are sequentially opened, preferably, raw water enters a coagulation tank for coagulation through a raw water output pipeline, a raw water pump and a first pipeline, the coagulated water enters a sedimentation tank for sedimentation through a coagulation tank output pipeline and a third pipeline, supernatant water enters an intermediate tank through a fifth pipeline after the sedimentation is finished, a third port of the first connecting valve is opened, other ports of the first connecting valve are closed, water enters a sand filter tank for sand filtration through a fifth pipeline and a lift pump through a third port of the first connecting valve, the first port of the first connecting valve is opened after the sand filtration is finished, other ports of the first connecting valve are closed, a third port of the second connecting valve is opened, and other ports of the second connecting valve are closed, water enters the deaerating tank from the first port of the first connecting valve through the ninth pipeline and the third port of the second connecting valve for deaerating treatment, the first port of the second connecting valve is opened, other ports of the second connecting valve are closed, then the water enters the precision filtration tank through the first port of the second connecting valve and the precision filtration connecting pipeline for secondary filtration treatment, finally clear water is obtained and enters the water production tank through the tenth pipeline for storage,

when the sand filter tank and the deaerating tank are backwashed, a twenty-second valve, a twenty-third valve, a twenty-fourth valve, a first connecting valve and a second connecting valve are sequentially opened, other valves are closed, a backwash pump is started, the first connecting valve and the second connecting valve are driven to a drainage gear to discharge waste water after backwashing is finished, preferably, when the sand filter tank is backwashed, a third port of the first connecting valve is opened, other ports of the first connecting valve are closed, water flows into the sand filter tank through a first backwash pipeline, the backwash pump, a third backwash branch and the third port of the first connecting valve to be backwashed, after backwashing is finished, the second port of the first connecting valve is opened, other ports of the first connecting valve are closed, water flows through the second port of the first connecting valve and a second backwash discharge system, when the deaerating tank is backwashed, the third port of the second connecting valve is opened, other ports of the second connecting valve are closed, water flows into the deaerating tank for backwashing through the first backwashing pipeline, the backwashing pump, the second backwashing branch and the third port of the second connecting valve, the second port of the second connecting valve is opened after backwashing is finished, other ports of the second connecting valve are closed, and the water is discharged out of the system through the second port of the second connecting valve and the first backwashing drainage pipeline;

when the coagulation filtration process is used, a first valve, a second valve, a fifth valve, a twelfth valve, a thirteenth valve, a seventeenth valve and a nineteenth valve are sequentially opened, preferably, raw water enters a coagulation tank for coagulation through a raw water output pipeline, a raw water pump and a first pipeline, water after coagulation enters an intermediate tank through a coagulation tank output pipeline and a fourth pipeline, enters a tubular membrane for filtration through a first branch and a lift pump, and clear water enters a water production tank through a tubular membrane water outlet pipe after filtration is finished;

when the tubular membrane is backwashed, a twenty-second valve and a twenty-sixth valve are sequentially opened, a backwash pump is opened, a fifteenth valve is opened after backwashing is finished to discharge wastewater, preferably, water enters the tubular membrane through a first backwash pipeline, the backwash pump and a first backwash branch, and the water is discharged through a tubular membrane concentrated water discharge pipeline after backwashing is finished;

when the chemical reaction filtering ammonia nitrogen removal process is used, a first valve, a second valve, a fifth valve, a twelfth valve, a thirteenth valve, a seventeenth valve and a nineteenth valve are sequentially opened, and the rest valves of the platform are closed, preferably, raw water enters a coagulation tank through a raw water output pipeline, a raw water pump and a first pipeline for chemical reaction ammonia nitrogen removal, then enters an intermediate tank through a coagulation tank output pipeline and a fourth pipeline, enters a tubular membrane through a first branch and a lifting pump for filtering, and after the filtering is finished, clear water enters a water production tank through a tubular membrane water outlet pipe;

when the biological ammonia nitrogen removal filtration process is used, the first valve, the third valve, the twenty-ninth valve, the twelfth valve, the thirteenth valve, the seventeenth valve and the nineteenth valve are opened in sequence, the blower is started, the air quantity entering the BAF is regulated through the twenty-seventh valve and the twenty-eighth valve, when the tubular membrane is backwashed, a twenty-second valve and a twenty-sixth valve are sequentially opened, a backwash pump is opened, a fifteenth valve is opened after backwashing is finished to discharge wastewater, preferably, raw water enters the BAF through a raw water output pipeline, a raw water pump and a second pipeline to biologically remove ammonia nitrogen, after the reaction is finished, water enters the intermediate tank through a BAF output pipeline and a seventh pipeline, enters the sand filtration tank through a fifth pipeline and a lifting pump for sand filtration treatment, enters the tubular membrane for filtration through an eighth pipeline, and after filtration is finished, clear water enters the water production tank through a tubular membrane water outlet pipe;

when the BAF is backwashed, a twenty-second valve and a twenty-fifth valve are sequentially opened, a backwash pump is opened, a thirtieth valve is opened after backwashing is finished to discharge wastewater, preferably, water enters the BAF through a first backwash pipeline, the backwash pump and a fourth backwash branch, and after backwashing is finished, the water is discharged out of a system through a BAF output pipeline and a third backwash drainage pipeline;

when the hardness-removing and desalting process is used, sequentially opening a thirty-first valve, a thirty-second valve and a thirty-third valve, starting a water supply pump and a high-pressure pump, and closing the other valves, preferably, enabling water to enter a security filter through an eleventh pipeline and the water supply pump for filtering, enabling the water to enter a nanofiltration membrane through a twelfth pipeline and the high-pressure pump for secondary filtering after the filtering is finished, and enabling the water to enter a cleaning tank through a first connecting pipe after the filtering is finished;

when the nanofiltration membrane is cleaned, a thirty-seventh valve, a thirty-twelfth valve, a thirty-third valve, a thirty-fourth valve and a thirty-sixth valve are sequentially opened, a water supply pump and a high-pressure pump are started, and the other valves are closed.

Compared with the prior art, the invention has the beneficial effects that:

1. the experimental platform consists of a coagulating sedimentation process, a coagulating filtration process, a chemical precipitation filtration ammonia nitrogen removal process, a biological ammonia nitrogen removal filtration process and a hardness and salt removal process. Different processes can be combined according to different raw water qualities and recharge water quality requirements, different treatment process experiments are carried out, different process treatment effects, operation stability and treatment cost are investigated, and finally a treatment process scheme with standard water quality and low treatment cost is obtained.

2. The experiment platform can rapidly switch different treatment processes, save experiment time and improve efficiency. The method is favorable for selecting the optimal treatment process in the shortest time, and the experimental platform comprises the existing geothermal tail water treatment process and can also be used for the water quality treatment experiment of the geothermal tail water.

3. The treatment capacity of the experimental platform is 0.5-1t/h, the water demand is 2t, the treatment time is 2-4h, and the quality of produced water is stable and representative.

Drawings

FIG. 1 shows a general process diagram of an experimental platform.

FIG. 2 is a flow chart of the coagulating sedimentation process.

FIG. 3 is a flow chart of the coagulation filtration process.

FIG. 4 is a flow chart of the process for filtering ammonia nitrogen by chemical reaction.

FIG. 5 is a flow chart of the biological ammonia nitrogen removal filtration process.

FIG. 6 is a flow chart of the de-hardening and desalting process.

FIG. 7 is a process diagram of a coagulating sedimentation process.

FIG. 8 is a process diagram of the coagulation filtration process.

FIG. 9 is a process diagram of ammonia nitrogen filtering by chemical reaction.

FIG. 10 is a process diagram of a biological ammonia nitrogen removal filtration process.

FIG. 11 is a diagram of a process for de-hardening and de-salting.

In the figure: 1-raw water tank, 2-coagulation tank, 3-BAF, 4-precipitation tank, 5-intermediate tank, 6-tubular membrane, 7-sulfate tank, 8-sand filtration tank, 9-deaerating tank, 10-microfiltration, 11-product water tank, 12-cartridge filtration, 13-nanofiltration membrane, 14-cleaning tank, 15-lye tank, 16-bactericide tank, 17-coagulant tank, 18-magnesium salt tank, 19-reducing agent tank, 20-scale inhibitor tank, 21-raw water pump, 22-pipeline pump, 23-blower, 24-circulating pump, 25-lift pump, 26-backwash pump, 27-water supply pump, 28-high pressure pump, 29-raw water output pipeline, 30-first pipeline, 31-second pipeline, 32-a coagulation tank output pipeline, 33-a fourth pipeline, 34-a fifth pipeline, 35-a first branch, 36-a second branch, 37-a sixth pipeline, 38-a BAF output pipeline, 39-a seventh pipeline, 40-a sand filtration tank connecting pipeline, 41-a deoxygenation tank connecting pipeline, 42-an eighth pipeline, 43-a ninth pipeline, 44-a tenth pipeline, 45-an eleventh pipeline, 46-a twelfth pipeline, 47-a concentrated water detecting pipe, 48-a concentrated water discharging pipeline, 49-a precise filtration connecting pipeline, 50-a first connecting pipe, 51-a tubular membrane water outlet pipe, 52-a third pipeline, 53-an intermediate tank emptying pipe, 54-a first backwashing pipeline, 55-a tubular membrane concentrated water discharging pipeline, 56-a first backwashing water discharging pipeline, 57-a second backwash drainage pipe, 58-a third backwash drainage pipe, 59-a fourth backwash branch, 60-a third backwash branch, 61-a second backwash branch, 62-a blast pipe, 63-a gas regulating pipe, 64-a coagulation tank emptying pipe, 65-a sedimentation tank emptying pipe, 66-a water production tank emptying pipe, 67-a cleaning tank emptying pipe, 68-a first backwash branch, 69-a cleaning pipe,

v1-first valve, V2-second valve, V3-third valve, V4-fourth valve, V5-fifth valve, V6-sixth valve, V7-seventh valve, V8-eighth valve, V9-ninth valve, V10-tenth valve, V11-eleventh valve, V12-twelfth valve, V13-thirteenth valve, V14-fourteenth valve, V15-fifteenth valve, V16-sixteenth valve, V17-seventeenth valve, V18-eighteenth valve, V19-nineteenth valve, V20-twentieth valve, V21-twenty-first valve, V22-twenty-second valve, V23-second thirteenth valve, V24-twenty-fourth valve, V25-twenty-fifth valve, V26-twenty-sixth valve, V27-seventh valve, v28-twenty-eighth valve, V29-twenty-ninth valve, V30-thirty-third valve, V31-thirty-first valve, V32-thirty-second valve, V33-thirty-third valve, V34-thirty-fourth valve, V35-thirty-fifth valve, V36-thirty-sixth valve, V37-thirty-seventh valve, S01-first connecting valve and S02-second connecting valve.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The utility model provides an experiment platform that surface water was handled as geothermal make-up water recharge, includes former water pitcher 1, adds medicine jar group, coagulating basin 2, gunbarrel 4, BAF (aeration biological filter) 3, intermediate tank 5, tubular membrane 6, sand filtration jar 8, oxygen-eliminating jar 9, microfiltration 10, product water tank 11, wherein:

along the rivers direction, the selective connection coagulation tank 2 or BAF3 of raw water output pipeline 29 of former water tank 1, be equipped with raw water pump 21 on the raw water output pipeline 29, be connected with on the pipeline between former water tank 1 and the coagulation tank 2 and add the medicine tank group, it includes germicide jar 16, coagulant jar 17, magnesium salt jar 18, lye tank 15 and sulfate jar 7 to add the medicine tank group. 2 selective connection gunbarrel 4 or pans 5 of coagulation tank, BAF3 pass through the pipeline with pans 5 are connected, are equipped with the pipeline of optional intercommunication between gunbarrel 4 and the pans 5, the selective connection sand filtration jar 8 or tubular membrane 6 of pans 5, pans 5 with be equipped with the circulating line between the tubular membrane 6, be equipped with circulating pump 24 on the circulating line, pans 5 with be equipped with elevator pump 25 on the pipeline between the sand filtration jar 8, the selective connection tubular membrane 6 or the oxygen-eliminating tank 9 of sand filtration jar 8, oxygen-eliminating tank 9 is connected to through precision filtration 10 product water jar 11, tubular membrane 6 is connected to product water jar 11.

Experiment platform is still including taking off hard desalination module, along the water flow direction, take off hard desalination module and include that the security personnel filter 12, receive filter membrane 13 and wash jar 14 in proper order, the security personnel filter 12 the water inlet with the delivery port of producing water pitcher 11 is linked together, be connected with water supply pump 27, reducing agent jar 19 and antisludging agent jar 20 on the pipeline between producing water pitcher 11 and the security personnel filter 12, the security personnel filter 12 with receive filter membrane 13 through the pipe connection who is equipped with high-pressure pump 28, receive filter membrane 13's water purification delivery port pass through the pipeline with wash jar 14 intercommunication.

The experiment platform further comprises a backwashing module and a cleaning module, the water production tank 11 is connected with the sand filter tank 8, the tubular membrane 6 and the deaerating tank 9 through a backwashing pipeline, a backwashing pump 26 is arranged on the backwashing pipeline, and the cleaning tank 14 is connected to the security filter 12 through a cleaning pipeline 69.

Example 2

The experimental platform described in example 1 can be used for carrying out various process operations such as coagulating sedimentation, coagulating filtration, ammonia nitrogen filtration by chemical reaction, biological ammonia nitrogen removal filtration, hardness removal and desalination. Before the experiment, firstly, water quality measurement is carried out, a proper process is selected according to components to be removed, the following process method 2.5 can be matched with any one process method from 2.1 to 2.4 for use, different process routes from 2.1 to 2.4 are adopted, or any one process route from 2.1 to 2.4 is matched with the process method 2.5 for use, the surface water is treated, the water quality components after treatment are analyzed, the cost is calculated, and the process route has better treatment effect and lower operation cost than the process route selected.

2.1 coagulating sedimentation process

Utilize embodiment 1 the experiment platform carries out the coagulating sedimentation technology during, as shown in fig. 2, along the rivers direction, former water pitcher 1, coagulating tank 2, gunbarrel 4, pans 5, sand filter tank 8, oxygen-eliminating tank 9, microfiltration 10, product water tank 11 communicates in proper order, configuration coagulant and germicide, coagulant and germicide pass through germicide jar 16 and coagulant jar 17 and add on coagulating tank 2, start former water pump 21, start the agitator on dosing pump and the coagulating tank 2 simultaneously, accomplish the sediment in gunbarrel 4, treat that 5 liquid levels in pans reach the take the altitude, start elevator pump 25, sand filter tank 8 and oxygen-eliminating tank 9 filter and deoxidization to rivers, enter into microfiltration 10 secondary microfiltration behind the deoxidization, it stores in product water pitcher 11 to go out water entering. Then back washing is carried out at regular time according to the specific water quality. In the operation process, the dosage is adjusted according to the water quality condition of the effluent until the effluent quality meets the requirement.

During backwashing, the backwashing pump 26 is started, and water in the water production tank 11 enters the sand filter tank 8 and the deaerating tank 9 for backwashing.

2.2 coagulating and filtering process

When the experiment platform is utilized to carry out the coagulation filtration process, as shown in fig. 3, along the water flow direction, the raw water tank 1, the coagulation tank 2, the intermediate tank 5, the tubular membrane 6 and the water production tank 11 are communicated in sequence, the raw water tank 1 is filled with surface water to be treated, a coagulant and a bactericide are added into the coagulation tank 2 through the bactericide tank 16 and the coagulant tank 17, the raw water pump 21 is started, the medicine adding pump and a stirrer on the coagulation tank 2 are started simultaneously, the circulating pump 24 on a circulating pipeline is started when the liquid level of the intermediate tank 5 reaches a certain height, the tubular membrane 6 is repeatedly filtered, the medicine adding amount and the tubular membrane operating parameters are adjusted according to the water quality condition in the operating process, and the effluent enters the water production tank 11 to be stored until the effluent water quality meets the requirements.

During backwashing, the backwashing pump 26 is started, and water in the water production tank 11 enters the tubular membrane 6 for backwashing.

2.3 chemical reaction filtering process for removing ammonia nitrogen

When the experiment platform is utilized to carry out a process of filtering ammonia nitrogen through chemical reaction, as shown in fig. 4, along the water flow direction, the raw water tank 1, the coagulation tank 2, the intermediate tank 5, the tubular membrane 6 and the water production tank 11 are sequentially communicated, sulfate, magnesium salt and alkali liquor with certain concentration are configured, the magnesium salt tank 18, the alkali liquor tank 15 and the sulfate tank 7 are started, the sulfate, the magnesium salt and the alkali liquor are added into the coagulation tank 2 through the magnesium salt tank 18, the alkali liquor tank 15 and the sulfate tank 7, the raw water pump 21 is started, the dosing pump and the stirrer on the coagulation tank 2 are simultaneously started, when the liquid level of the intermediate tank 5 reaches a certain height, the circulating pump 24 is started, the tubular membrane 6 is repeatedly filtered, the adding amount of the ammonia nitrogen removal agent is adjusted according to the water quality condition in the operation process, and when the water quality meets the requirement, the effluent enters the water production tank 11 for storage.

2.4 Biochemical ammonia nitrogen removal filtration process

When the biochemical ammonia nitrogen removal filtration process is carried out by utilizing the experimental platform, as shown in fig. 5, the raw water tank 1, the BAF3, the intermediate tank 5, the sand filtration tank 8, the tubular membrane 6 and the water production tank 11 are sequentially communicated along the water flow direction, firstly, the microorganisms in the BAF3 are cultured and domesticated, and because the microorganism in the BAF needs to be cultured and domesticated in the process, the experimental period is relatively long, and the bacterial state and the process parameters in the BAF are optimized until the effluent quality meets the requirements. Raw water firstly enters BAF3 for biological ammonia nitrogen removal, then enters an intermediate tank 5, under the action of a lift pump 25, the water after ammonia nitrogen removal sequentially enters a sand filter tank 8 and a tubular membrane 6 for filtration, and the effluent enters a water production tank 11 for storage.

During backwashing, the backwashing pump 26 is started, and water in the water production tank 11 enters the sand filtration tank 8 and the tubular membrane 6 for backwashing.

2.5 Dehardening and desalting Process

The hardness removal and desalination process is used as a supplementary process, as shown in figure 6, and is matched with several processes of 2.1-2.4, as shown in figure 5, and a water production tank 11, a security filter 12, a nanofiltration membrane 13 and a cleaning tank 14 are communicated in sequence along the water flow direction. A reducing agent and a scale inhibitor with certain concentration are prepared, the reducing agent and the scale inhibitor are added into a security filter 12 through a reducing agent tank 19 and a scale inhibitor tank 20, when the liquid level of a water production tank 11 reaches a certain height, a water supply pump 27 and a high-pressure pump 28 are started, the operating parameters of a nanofiltration system are adjusted until the produced water meets the requirements, and clean water enters a cleaning tank 14 for storage.

During cleaning, the water supply pump 27 and the high-pressure pump 28 are started, and water in the cleaning tank 14 enters the security filter 12 and the nanofiltration membrane 13 through the cleaning pipeline 69 for cleaning.

Example 3

On the basis of the embodiment 1, the pipeline connection relationship between the devices is optimized.

Be connected with raw water output pipeline 29 on the delivery port of raw water tank 1, along the rivers direction, raw water output pipeline 29 is last to have set gradually first valve V1, raw water pump 21 and add the medicine jar group, each jar of adding the medicine jar group respectively through one add medicine pipe connection in raw water output pipeline 29 all is provided with the medicine pump on each jar.

The raw water output pipeline 29 is selectively connected with a coagulation tank 2 or BAF 3:

a water outlet of the raw water output pipeline 29 is connected to a water inlet of the coagulation tank 2 through a first pipeline 30 and is connected to a water inlet of the BAF3 through a second pipeline 31, a second valve V2 is arranged on the first pipeline 30, and a third valve V3 is arranged on the second pipeline 31;

the coagulation tank 2 is selectively connected with a settling tank 4 or an intermediate tank 5:

a coagulation tank output pipeline 32 is connected to a water outlet of the coagulation tank 2, the coagulation tank output pipeline 32 is connected with a water inlet of the sedimentation tank 4 through a third pipeline 52, and the third pipeline 52 is provided with a fourth valve V4; the mixing tank output pipeline 32 is connected with a water inlet of the intermediate tank 5 through a fourth pipeline 33; a fifth valve V5 is provided on the fourth pipe 33.

The water outlet of the BAF3 is connected with the water inlet of the intermediate tank 5:

a BAF output pipeline 38 is connected to a water outlet of the BAF3, the BAF output pipeline 38 is connected with a water inlet and a water outlet of the intermediate tank 5 through a seventh pipeline 39, and the seventh pipeline 39 is provided with a twenty-ninth valve V29.

The BAF3 is further connected with a blast pipe 62, and along the air current direction, the blast pipe 62 is provided with a blower 23 and a twenty-eighth valve V28 in sequence, a gas adjusting pipe 63 is arranged between the twenty-eighth valve V28 and the blower 23, and the gas adjusting pipe 63 is provided with a twenty-seventh valve V27. The air quantity entering the BAF3 is adjusted through a twenty-seventh valve V27 and a twenty-eighth valve V28, so that the culture and domestication of microorganisms are assisted.

A pipeline which can be selectively communicated is arranged between the settling tank 4 and the intermediate tank 5:

the water outlet of the settling tank 4 is communicated with the intermediate tank 5 through a fifth pipeline 34, specifically, the outlet of the fifth pipeline 34 is connected to the fourth pipeline 33, the connection position of the fifth pipeline 34 and the fourth pipeline 33 is located between the fifth valve V5 and the water inlet of the intermediate tank 5, and the fifth pipeline 34 is provided with a sixth valve V6.

The intermediate tank 5 is selectively connected with a sand filter tank 8 or a tubular membrane 6:

the water outlet of the intermediate tank 5 is connected with the water inlet of the tubular membrane 6 through a first branch 35, the water outlet of the tubular membrane 6 is connected with the water inlet of the intermediate tank 5 through a second branch 36, the first branch 35 and the second branch 36 form a circulation pipeline between the intermediate tank 5 and the tubular membrane 6, the intermediate tank 5, the first branch 35, the tubular membrane 6 and the second branch 36 are connected end to form a closed loop, a twelfth valve V12, a circulation pump 24 and a thirteenth valve V13 are sequentially arranged on the first branch 35 along the water flow direction, and a nineteenth valve V19 is arranged on the second branch 36. The purified water outlet of the tubular membrane 6 is connected with the water inlet of the water producing tank 11 through a tubular membrane water outlet pipe 51, and the tubular membrane water outlet pipe 51 is provided with a seventeenth valve V17.

The water port of the sand filtering tank 8 is connected with a sand filtering tank connecting pipeline 40, and the sand filtering tank connecting pipeline 40 is connected with the connecting port of the first connecting valve S01.

The water outlet of the intermediate tank 5 is connected with the third port of the first connecting valve S01 through a sixth pipeline 37, and an eighth valve V8, a lift pump 25 and a ninth valve V9 are sequentially arranged on the sixth pipeline 37 along the water flow direction.

The sand filtering tank 8 is selectively connected with a tubular membrane 6 or a deaerating tank 9:

the water gap of the deoxygenation tank 9 is connected with a deoxygenation tank connecting pipeline 41, and the deoxygenation tank connecting pipeline 41 is connected with a second connecting valve S02.

A first port of the first connection valve S01 is connected to a third port of the second connection valve S02 through a ninth pipe 43, a tenth valve V10 is disposed on the ninth pipe 43, a second port of the first connection valve S01 is connected to the water inlet of the tubular membrane 6 through an eighth pipe 42, and a fourteenth valve V14 is disposed on the eighth pipe 42.

The deoxygenation tank 9 is connected to the water production tank 11 through a fine filter 10:

a first port of the second connection valve S02 is connected to the water inlet of the microfiltration machine 10 through a microfiltration connection pipe 49, and is connected to the microfiltration machine 10 through a tenth pipe 44 and the water production tank 11, and an eleventh valve V11 is arranged on the tenth pipe 44.

The de-hardening desalting module comprises a security filter 12, a nanofiltration membrane 13 and a cleaning tank 14:

the water outlet of the water production tank 11 is connected with the water inlet of the security filter 12 through an eleventh pipeline 45, a thirty-first valve V31, a water supply pump 27 and a thirty-second valve V32 are sequentially arranged on the eleventh pipeline 45 along the water flow direction, the reducing agent tank 19 and the scale inhibitor tank 20 are sequentially connected on the eleventh pipeline 45, a connecting port is located between the thirty-second valve V32 and the water inlet of the security filter 12, specifically, the reducing agent tank 19 and the scale inhibitor tank 20 are respectively connected on the eleventh pipeline 45 through a dosing pipeline, and the reducing agent tank 19 and the scale inhibitor tank 20 are respectively provided with a dosing pump.

The water outlet of the security filter 12 is connected to the water inlet of the nanofiltration membrane 13 through a twelfth pipeline 46, the twelfth pipeline 46 is sequentially provided with a high-pressure pump 28 and a thirty-third valve V33 along the water flow direction, the concentrated water outlet of the nanofiltration membrane 13 is connected with a concentrated water discharge pipeline 48, the concentrated water discharge pipeline 48 is sequentially provided with a thirty-fourth valve V34 and a thirty-sixth valve V36 along the water flow direction, the concentrated water discharge pipeline 48 is connected with a concentrated water detection pipe 47, specifically, a connection port of the concentrated water detection pipe 47 and the concentrated water discharge pipeline 48 is located between the thirty-sixth valve V36 and the thirty-fourth valve V34, and the concentrated water detection pipe 47 is used for detecting the concentrated water of the nanofiltration membrane 13. The clean water outlet of the nanofiltration membrane 13 is connected to the cleaning tank 14 through a first connection pipe 50.

Example 4

On the basis of embodiment 3, in order to facilitate cleaning and maintenance of the geothermal makeup water recharging treatment experiment platform by using surface water, the geothermal makeup water recharging treatment experiment platform is provided with a backwashing pipeline, a cleaning pipeline and an emptying pipeline.

The water outlet of the water production tank 11 is connected with a first backwashing pipeline 54, a twenty-second valve V22 and a backwashing pump 26 are sequentially arranged on the first backwashing pipeline 54 along the water flow direction, the outlet of the backwashing pump 26 is connected to the backwashing port of the tubular membrane 6 through a first backwashing branch 68, the first backwashing branch 68 is provided with a twenty-sixth valve V26, the concentrated water discharge port of the tubular membrane 6 is connected with a tubular membrane concentrated water discharge pipeline 55, and the tubular membrane concentrated water discharge pipeline 55 is provided with a fifteenth valve V15.

The outlet of the backwash pump 26 is connected with the deoxygenation tank 9 through a second backwash branch 61, specifically, the second backwash branch 61 is connected with a ninth pipeline 43 or the deoxygenation tank connecting pipeline 41, the second backwash branch 61 is provided with a twenty-fourth valve V24, the second connecting valve S02 is further connected with a first backwash drainage pipeline 56, and the first backwash drainage pipeline 56 is connected with the second port of the second connecting valve S02 and used for draining wastewater generated by backwashing the deoxygenation tank 9.

The backwash pump 26 is connected to the sand filtration tank 8 through a third backwash bypass 60, specifically, the third backwash bypass 60 is connected to a sixth pipeline 37 between the ninth valve V9 and a first connection valve S01 of the sand filtration tank 8, and a second backwash drain pipe 57 is connected to a second port of the first connection valve S01.

The outlet of the backwash pump 26 is communicated with the water inlet of the BAF3 through a fourth backwash branch 59, the water outlet of the BAF3 is connected with a third backwash water discharge pipe 58, specifically, the fourth backwash branch 59 is connected between the first backwash branch 68 and the raw water output pipe 29, and the connection points are respectively located between the backwash pump 26 and the twentieth valve V23 and between the third valve V3 and the BAF 3. The seventh pipe 39 is connected with a third backwashing water discharge pipe 58, and the third backwashing water discharge pipe 58 is provided with a thirtieth valve V30.

Thoughtlessly congeal jar 2 and be connected with congeal jar evacuation pipeline 64, congeal jar evacuation pipeline 64 is provided with twentieth valve V20, settling cask 4 is connected with settling cask evacuation pipeline 65, settling cask evacuation pipeline 65 is connected with the sixteenth valve, pans 5 are connected with pans evacuation pipe 53, pans evacuation pipe 53 is provided with seventh valve V7, it is connected with produces tank evacuation pipeline 66 to produce tank bottom, it is provided with twenty first valve V21 to produce tank evacuation pipeline 66, it is provided with eighteenth valve V18 to wash tank evacuation pipeline 67.

The water outlet of the cleaning tank 14 is connected with an eleventh pipeline 45 through a cleaning pipeline 69, a connecting port is positioned between a thirty-first valve V31 and the water supply pump 27, and the cleaning pipeline 69 is provided with a thirty-seventh valve V37.

Example 5

Based on examples 3 and 4, the processes were used in the following manner.

5.1 coagulating sedimentation process

When the coagulation sedimentation process is used, as shown in fig. 7, a first valve V01, a second valve V02, a fourth valve V04, a sixth valve V06, an eighth valve V08, a ninth valve V09, a tenth valve V10, an eleventh valve V11, a first connection valve S01 and a second connection valve S02 are sequentially opened, specifically, raw water enters the coagulation tank 2 for coagulation through the raw water output pipeline 29, the raw water pump 21 and the first pipeline 30, water after coagulation enters the sedimentation tank 4 for sedimentation through the coagulation tank output pipeline 32 and the third pipeline 52, supernatant water enters the intermediate tank 5 through the fifth pipeline 34 after sedimentation is completed, the third port of the first connection valve S01 is opened, the other ports of the first connection valve S01 are closed, water enters the sand filter tank 8 through the fifth pipeline 37 and the lift pump 25 through the first port of the first connection valve S01 for sand filtration treatment, the first connection valve S01 of the first connection valve S3884 and the other ports are closed, the third port of the second connecting valve S02 is opened, the other ports of the second connecting valve S02 are closed, water enters the deaerating tank 9 for deaerating treatment from the first port of the first connecting valve S01 through the ninth pipeline 43 and the third port of the second connecting valve S02, the first port of the second connecting valve S02 is opened, the other ports of the second connecting valve S02 are closed, and then the water enters the microfiltration tank 10 for secondary filter treatment through the first port of the second connecting valve S02 and the microfiltration connecting pipeline 49, and finally clear water is obtained and enters the water production tank 11 for storage through the tenth pipeline 44.

When the sand filter tank 8 and the deaerating tank 9 are backwashed, a twenty-second valve V22, a twenty-third valve V23, a twenty-fourth valve V24, a first connecting valve S01 and a second connecting valve S02 are opened in sequence, other valves are closed, a backwash pump 26 is started, and after the backwashing is finished, the first connecting valve S01 and the second connecting valve S02 are driven to a drainage gear to discharge wastewater. Specifically, when the sand filtration tank 8 is backwashed, the third port of the first connecting valve S01 is opened, the other ports of the first connecting valve S01 are closed, water flows into the sand filtration tank 8 through the first backwash pipeline 54, the backwash pump 26, the third backwash branch 60 and the third port of the first connecting valve S01 for backwashing, the second port of the first connecting valve S01 is opened after backwashing is finished, the other ports of the first connecting valve S01 are closed, and water is discharged out of the system through the second port of the first connecting valve S01 and the second backwash drain pipeline 57. When the deaerating tank 9 is backwashed, the third port of the second connecting valve S02 is opened, the other ports of the second connecting valve S02 are closed, water flows into the deaerating tank 9 through the first backwashing pipeline 54, the backwashing pump 26, the second backwashing branch 61 and the third port of the second connecting valve S02 for backwashing, the second port of the second connecting valve S02 is opened after backwashing is finished, the other ports of the second connecting valve S02 are closed, and the water is discharged out of the system through the second port of the second connecting valve S02 and the first backwashing drainage pipeline 56.

5.2 coagulating and filtering process

When the coagulation filtration process is used, as shown in fig. 8, the first valve V01, the second valve V02, the fifth valve V05, the twelfth valve V12, the thirteenth valve V13, the seventeenth valve V17 and the nineteenth valve V19 are sequentially opened, specifically, raw water enters the coagulation tank 2 through the raw water output pipeline 29, the raw water pump 21 and the first pipeline 30 for coagulation, the coagulated water enters the intermediate tank 5 through the coagulation tank output pipeline 32 and the fourth pipeline 33, enters the tubular membrane 6 through the first branch 35 and the lift pump 24 for filtration, and after filtration, clean water enters the water production tank 11 through the tubular membrane water outlet pipe 51.

When the tubular membrane 6 is backwashed, the twenty-second valve V22 and the twenty-sixth valve V26 are sequentially opened, the backwashing pump 26 is opened, the fifteenth valve V15 is opened after backwashing is finished to discharge wastewater, specifically, water enters the tubular membrane 6 through the first backwashing pipeline 54, the backwashing pump 26 and the first backwashing branch 68, and the water is discharged through the tubular membrane concentrated water discharge pipeline 55 after backwashing is finished.

5.3 chemical reaction filtering process for removing ammonia nitrogen

When the chemical reaction filtration ammonia nitrogen removal process is used, as shown in fig. 9, a first valve V01, a second valve V02, a fifth valve V05, a twelfth valve V12, a thirteenth valve V13, a seventeenth valve V17 and a nineteenth valve V19 are sequentially opened, and the rest valves of the platform are closed, specifically, raw water enters the coagulation tank 2 through a raw water output pipeline 29, a raw water pump 21 and a first pipeline 30 to carry out chemical reaction to remove ammonia nitrogen, then enters the intermediate tank 5 through the coagulation tank output pipeline 32 and a fourth pipeline 33, enters the tubular membrane 6 through a first branch 35 and a lift pump 24 to be filtered, and after the filtration is finished, clean water enters the water production tank 11 through a tubular membrane water outlet pipe 51.

5.4 Biochemical ammonia nitrogen removal filtering process

When the biological ammonia nitrogen removal filtration process is used, as shown in fig. 10, a first valve V01, a third valve V03, a twenty-ninth valve V29, a twelfth valve V12, a thirteenth valve V13, a seventeenth valve V17 and a nineteenth valve V19 are opened in sequence, an air blower 23 is started, and the air volume entering BAF is adjusted through a twenty-seventh valve V27 and a twenty-eighth valve V28. When the tubular membrane 6 is backwashed, the twenty-second valve V22 and the twenty-sixth valve V26 are sequentially opened, the backwash pump 26 is opened, the fifteenth valve V15 is opened after backwashing is finished to discharge wastewater, specifically, raw water enters the BAF3 through the raw water output pipeline 29, the raw water pump 21 and the second pipeline 31 to biologically remove ammonia nitrogen, after reaction is finished, water enters the intermediate tank 5 through the BAF output pipeline 38 and the seventh pipeline 39, enters the sand filter tank 8 through the fifth pipeline 37 and the lift pump 25 to be subjected to sand filtration, the specific sand filtration process is the same as that of the embodiment 5.1, enters the tubular membrane 6 through the eighth pipeline 42 to be filtered, and clean water enters the water production tank 11 through the tubular membrane outlet pipe 51 after filtration is finished.

When the BAF3 is backwashed, a twenty-second valve V22 and a twenty-fifth valve V25 are sequentially opened, a backwash pump 26 is opened, and a thirtieth valve V30 is opened after the backwashing is finished to discharge waste water. Specifically, water enters the BAF3 through the first backwash conduit 54, backwash pump 26 and fourth backwash bypass 59, and after backwashing is completed, the water is discharged out of the system through the BAF outlet conduit 38 and third backwash discharge conduit 58.

5.5 Dehardening and desalting Process

When the hardness-removing and desalting process is used, as shown in fig. 11, the thirty-first valve V31, the thirty-second valve V32 and the thirty-third valve V33 are sequentially opened, the water supply pump 27 and the high-pressure pump 28 are started, and the rest valves are closed, specifically, water enters the security filter 12 through the eleventh pipeline 45 and the water supply pump 27 for filtering, enters the nanofiltration membrane through the twelfth pipeline 46 and the high-pressure pump 28 for filtering again after filtering is finished, and enters the cleaning tank 14 through the first connecting pipe 50 after filtering is finished.

When the nanofiltration membrane 13 is cleaned, a thirty-seventh valve V37, a thirty-third valve V32, a thirty-third valve V33, a thirty-fourth valve V34 and a thirty-sixth valve V36 are sequentially opened, a water supply pump 27 and a high-pressure pump 28 are started, the rest valves are closed, specifically, water enters the security filter 12 through a cleaning pipeline 69 and the water supply pump 27, then enters the nanofiltration membrane through a twelfth pipeline 46 and the high-pressure pump 28 for cleaning, and after cleaning is finished, the water is discharged out of the system through a concentrated water discharge pipeline 48.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an experiment platform that surface water handled as geothermal make-up water recharge, its characterized in that includes former water pitcher, adds medicine jar group, coagulating basin, gunbarrel, BAF, pans, tubular membrane, sand filtration jar, oxygen-eliminating jar, microfiltration and product water pitcher, wherein:

2. The experimental platform of claim 1, wherein the drug-adding tank set comprises a bactericide tank, a coagulant tank, a magnesium salt tank, an alkali liquor tank and a sulfate tank.

3. The experiment platform as claimed in claim 1, further comprising a hardness removal desalting module, wherein the hardness removal desalting module sequentially comprises a security filter, a nanofiltration membrane and a cleaning tank along a water flow direction, a water inlet of the security filter is communicated with a water outlet of the water production tank, a water supply pump, a reducing agent tank and a scale inhibitor tank are connected to a pipeline between the water production tank and the security filter, the security filter is connected with the nanofiltration membrane through a pipeline provided with a high-pressure pump, and a purified water outlet of the nanofiltration membrane is communicated with the cleaning tank through a pipeline.

4. The experiment platform of claim 1, further comprising a backwashing module and a cleaning module, wherein the water production tank is respectively connected with the sand filtration tank, the tubular membrane and the oxygen removal tank through a backwashing pipeline, a backwashing pump is arranged on the backwashing pipeline, and the cleaning tank is connected with security filtration through a cleaning pipeline.

5. The experimental platform as claimed in claim 4, wherein a raw water output pipeline is connected to the water outlet of the raw water tank, and a first valve, a raw water pump and a dosing tank set are sequentially arranged on the raw water output pipeline along the water flow direction, each tank of the dosing tank set is respectively connected to the raw water output pipeline through a dosing pipeline, and a dosing pump is arranged on each tank;

6. An experimental method based on the experimental platform of claim 1, characterized in that:

step 1, water quality determination:

7. The experimental method as claimed in claim 6, wherein the coagulating sedimentation process, the coagulating filtration process, the chemical reaction filtration ammonia nitrogen removal process and the biochemical ammonia nitrogen removal filtration process can be carried out in combination with the hardness removal desalting process, and the hardness removal desalting process is carried out by: along the water flow direction, the water production tank, the security filter, the nanofiltration membrane and the cleaning tank are sequentially communicated, a reducing agent and a scale inhibitor are configured, the reducing agent and the scale inhibitor are added into the security filter through the reducing agent tank and the scale inhibitor tank, when the liquid level of the water production tank reaches a preset height, the water supply pump and the high-pressure pump are started, the operation parameters of the nanofiltration system are adjusted, and the clean water enters the cleaning tank to be stored until the produced water meets the requirements.

8. The experimental method of claim 7, wherein, when the coagulation sedimentation process is performed, the raw water tank, the coagulation tank, the sedimentation tank, the intermediate tank, the sand filter tank, the deaerating tank, the microfiltration tank and the water production tank are sequentially communicated along the water flow direction, a coagulant and a bactericide are configured, the coagulant and the bactericide are added into the coagulation tank through the bactericide tank and the coagulant tank, the raw water pump is started, the chemical adding pump and a stirrer on the coagulation tank are simultaneously started, sedimentation is completed in the sedimentation tank, when the liquid level of the intermediate tank reaches a preset height, the lift pump is started, the sand filter tank and the deaerating tank filter and deaerate the water flow, the water flow enters the microfiltration tank for secondary microfiltration after deaerating, the effluent enters the water production tank for storage, back flushing is timed according to specific water quality, the dosage is adjusted according to the effluent water quality condition during the operation until the effluent water quality meets the requirements, during backwashing, a backwashing pump is started, and water in the water production tank enters the sand filter tank and the deaerating tank for backwashing;

9. The experimental method as claimed in claim 8, wherein the step 2 further comprises a de-hardening and desalting process as a supplementary process, the processes in the step 2 are used in cooperation, the water production tank, the security filter, the nanofiltration membrane and the cleaning tank are sequentially communicated along the water flow direction, a reducing agent and a scale inhibitor are configured, the reducing agent and the scale inhibitor are added into the security filter through the reducing agent tank and the scale inhibitor tank, when the water level of the water production tank reaches, a water supply pump and a high-pressure pump are started, the operating parameters of the nanofiltration system are adjusted until the water production meets the requirements, clean water enters the cleaning tank to be stored, and when cleaning is performed, the water supply pump and the high-pressure pump are started, and the water in the cleaning tank enters the security filter and the nanofiltration membrane through the cleaning pipeline to be cleaned.

10. The assay of claim 9,

when the coagulation sedimentation process is used, a first valve, a second valve, a fourth valve, a sixth valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a first connecting valve and a second connection are sequentially opened, preferably, raw water enters a coagulation tank through a raw water output pipeline, a raw water pump and a first pipeline for coagulation, the coagulated water enters a sedimentation tank through a coagulation tank output pipeline and a third pipeline for sedimentation, supernatant water enters an intermediate tank through a fifth pipeline after the sedimentation is finished, a third port of the first connecting valve is opened, other ports of the first connecting valve are closed, the water enters a sand filtering tank through a fifth pipeline and a lifting pump through a third port of the first connecting valve for sand filtering treatment, the first port of the first connecting valve is opened after the sand filtering is finished, other ports of the first connecting valve are closed, a third port of the second connecting valve is opened, and other ports of the second connecting valve are closed, water enters the deaerating tank from the first port of the first connecting valve through the ninth pipeline and the third port of the second connecting valve for deaerating treatment, the first port of the second connecting valve is opened, other ports of the second connecting valve are closed, then the water enters the precision filtration tank through the first port of the second connecting valve and the precision filtration connecting pipeline for secondary filtration treatment, finally clear water is obtained and enters the water production tank through the tenth pipeline for storage,