CN111285510B - Wastewater treatment method in membrane treatment system - Google Patents

Wastewater treatment method in membrane treatment system Download PDF

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CN111285510B
CN111285510B CN202010333382.5A CN202010333382A CN111285510B CN 111285510 B CN111285510 B CN 111285510B CN 202010333382 A CN202010333382 A CN 202010333382A CN 111285510 B CN111285510 B CN 111285510B
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membrane
raw water
wastewater
tank
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CN111285510A (en
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李杉
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A method of treating wastewater in a membrane treatment system, comprising the steps of: 1) pre-treating; 2) removing impurities; 3) performing pressure reaction; 4) filtering by a security filter; 5) removing inorganic ions and other substances; 6) carrying out fluidized bed reaction; 7) adjusting the pH value; 8) controlling reflux; 9) carrying out circular treatment; 10) resetting the third control valve: and (4) after the wastewater in the step (9) is discharged and treated, repeating the steps (2) to (7), and continuing to circularly treat until the raw water treatment is finished. The invention has simple structure and obvious effect, can effectively solve the problem of wastewater treatment in a membrane treatment system, reduces the content of soluble total solids in the wastewater, achieves the aim of direct discharge, reduces the pollution to the environment, really realizes energy conservation and environmental protection, improves the water yield of membrane treatment, and has obvious social and economic benefits.

Description

Wastewater treatment method in membrane treatment system
Technical Field
The invention relates to wastewater treatment, in particular to a wastewater treatment method in a membrane treatment system.
Background
With the comprehensive implementation of sanitary Standard for Drinking Water (GB 5749-2006), the quality of drinking water for urban residents is improved comprehensively, water treatment is gradually upgraded to membrane treatment technology, however, the total soluble solids in wastewater of a membrane treatment system are high, according to the requirements of the Water quality Standard for Sewage discharge to urban sewer (CJ 343-2010) (hereinafter referred to as Standard), most of the wastewater cannot be normally discharged to the sewer, but directly discharged into a river channel, but certain adverse effect is caused to the environment, the part of the wastewater is usually blended by a large amount of raw water to reduce the total dissolved solid index in the wastewater, thereby meeting the requirement of discharge, but the method wastes a large amount of raw water, causes the increase of the raw water treatment per ton of water producing enterprises, increases the cost, therefore, improvement and innovation of wastewater treatment to solve wastewater discharge are technical problems to be solved urgently.
Disclosure of Invention
In view of the above situation, the present invention aims to provide a method for treating wastewater in a membrane treatment system, which can effectively reduce the total soluble solid content in wastewater without increasing the raw water intake of a water plant, so as to achieve the purpose of direct discharge, improve the membrane treatment water yield, and solve the problem of water resource waste.
In order to achieve the aim, the technical scheme of the invention is that the method for treating the wastewater in the membrane treatment system comprises the following steps:
1) pretreatment: setting a first PLC controller and a second PLC controller, controlling a first control valve and a third control valve to be in an open state by the first PLC controller and the second PLC controller, and enabling raw water to enter the immersed ultrafiltration membrane through a water inlet pipe;
2) removing impurities: raw water passes through the membrane wall from the outer side of the hollow fiber membrane in an immersed ultrafiltration membrane through siphoning to remove impurities such as colloid, bacteria, microorganisms, suspended matters and the like, and the filtered raw water enters an ultrafiltration water production tank;
3) and (3) pressurized reaction: raw water in the ultrafiltration water production tank enters a nanofiltration water inlet pump through a water outlet, the raw water is pressurized to 0.3Mpa through the nanofiltration water inlet pump, a scale inhibitor with the mass concentration of 10% and a reducing agent with the mass concentration of 10% are continuously added into a water inlet pipeline of a cartridge filter respectively through a scale inhibitor adding tank and a reducing agent adding tank, the adding amount of the scale inhibitor and the reducing agent is 3-5 ppm of the volume of the raw water, and the scale inhibitor and the reducing agent enter the cartridge filter after being subjected to chain reaction with ORP (oxidation reduction potential) of the raw water;
4) filtering by a cartridge filter: filtering raw water entering a cartridge filter to ensure that SDI (sludge density index) in the filtered raw water is less than or equal to 5, and pressurizing the filtered raw water to 0.6Mpa in a high-pressure pump and then entering a nanofiltration membrane;
5) removing inorganic ions and other substances: raw water entering a nanofiltration membrane is filtered in the nanofiltration membrane to remove inorganic ions, bacteria, viruses, organic matters and other substances, produced water treated by the nanofiltration membrane enters a water production tank and is sent out as a product, and concentrated water enters a concentrated water tank;
6) fluidized bed reaction: concentrated water in a concentrated water tank enters a fluidized bed through a pipeline, alkali liquor with the mass concentration of 30% and seed crystals with the particle size of 0.1-0.25 mm are added into the fluidized bed for 1 time a day through an alkali liquor tank and a seed crystal storage tank which are communicated with the fluidized bed, the concentrated water enters a static mixer after reacting in the fluidized bed to remove a large amount of TDS (dissolved total solids), and calcium carbonate particles produced by the fluidized bed reaction are discharged into a calcium carbonate particle storage tank;
7) adjusting the pH value: adding 30L/h acid liquor with the mass concentration of 30% into the static mixer through the acid liquor tank, adjusting the pH value in the static mixer to obtain waste water, and feeding the waste water into a water outlet tank for later use;
8) and (3) backflow control: the TDS detection probe, the second control valve and the third control valve are respectively connected with a second PLC controller, the TDS upper limit value and the TDS lower limit value of the second PLC controller are set, the TDS detection probe detects the effluent quality of wastewater in the effluent tank and transmits data to the second PLC controller, if the TDS of the wastewater does not reach the upper limit value, the effluent flows back to the immersed ultrafiltration membrane through the three-way pipe and the third control valve and is mixed with raw water, the backflow flow is detected through the flow meter, the data is transmitted to the first PLC controller, the first PLC controller controls the water inflow of the first control valve, and the water amount entering the immersed ultrafiltration membrane is kept to be the same as the initial raw water amount;
9) and (3) circulating treatment: mixing the backflow and the raw water, entering an immersed ultrafiltration membrane, repeating the steps 2-7 for multiple times, if the TDS detection probe detects that the effluent quality of the wastewater in the water tank exceeds an upper limit value, controlling a third control valve to be closed by a second PLC controller, simultaneously opening a second control valve, discharging the wastewater in an effluent tank through a three-way pipe and the second control valve, and discharging the wastewater to a town sewer after blending with the raw water;
10) resetting the third control valve: after the wastewater discharge treatment in the step 9, the flow meter detects no backflow, the first PLC controls the water inflow of the first control valve, the raw water entering the immersed ultrafiltration membrane is ensured to be the same as the water amount in the step 1, the raw water enters the immersed ultrafiltration membrane, the steps 2-7 are repeated, the TDS detection probe detects the effluent quality of the wastewater in the water outlet tank, the data are transmitted to the second PLC, the TDS content of the wastewater is smaller than the lower limit value, the second PLC controls the third control valve to be opened, the second control valve is closed at the same time, the wastewater flows back to the immersed ultrafiltration membrane, and the circular treatment is continued until the raw water treatment is completed.
The invention has simple structure and obvious effect, can effectively solve the problem of wastewater treatment in a membrane treatment system, reduces the content of soluble total solids in the wastewater, achieves the aim of direct discharge, reduces the pollution to the environment, really realizes energy conservation and environmental protection, improves the water yield of membrane treatment, and has obvious social and economic benefits.
Drawings
FIG. 1 is a block diagram of the architecture of the present invention.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings and the detailed description.
In the specific implementation of the invention, the raw water flow is 25000m3The treatment cycles three times are given by the following examples.
A method of treating wastewater in a membrane treatment system, comprising the steps of:
1) pretreatment: setting a first PLC (programmable logic controller) 19 and a second PLC 15, controlling a first control valve 1 and a third control valve 17 to be in an open state by the first PLC 19 and the second PLC 15, and enabling raw water to enter an immersed ultrafiltration membrane 2 through a water inlet pipe;
2) removing impurities: the raw water inflow in the immersed ultrafiltration membrane 2 is 25000m3D, raw water passes through the membrane wall from the outer side of the hollow fiber membrane through siphoning to remove impurities such as colloid, bacteria, microorganisms, suspended matters and the like, and the filtered raw water enters the ultrafiltration water production tank 3;
3) and (3) pressurized reaction: raw water in the ultrafiltration water production tank 3 enters a nanofiltration water inlet pump 4 through a water outlet, is pressurized to 0.3Mpa through the nanofiltration water inlet pump 4, and is continuously added with a scale inhibitor with the mass concentration of 10% and a reducing agent with the mass concentration of 10% into a water inlet pipeline of a security filter respectively through a scale inhibitor adding tank 25 and a reducing agent adding tank 26, wherein the adding amount of the scale inhibitor and the reducing agent is 3-5 ppm of the volume of the raw water, and the scale inhibitor and the reducing agent enter the security filter 5 after being subjected to chain reaction with ORP of the raw water;
4) filtering by a cartridge filter: the raw water entering the cartridge filter 5 is filtered, so that SDI in the filtered raw water is less than or equal to 5, and the filtered raw water enters a high-pressure pump 6 and is pressurized to 0.6Mpa and then enters a nanofiltration membrane 7;
5) removing inorganic ions and other substances: the raw water entering the nanofiltration membrane 7 is filtered in the nanofiltration membrane 7 to remove inorganic ions, bacteria, viruses, organic matters and other substances, the produced water treated by the nanofiltration membrane 7 enters the water production tank 13, and the water yield is 20000m3D, TDS is 15mg/L, the produced water is delivered as a product, and the water content of the concentrated water is 5000m3The TDS is 2795mg/L, and the water enters a concentrated water tank 8;
6) fluidized bed reaction: concentrated water in the concentrated water tank 8 enters the fluidized bed 9 through a pipeline, 50L/h of NaOH solution with the mass concentration of 30% and 25kg/d of garnet with the particle size of 0.1-0.25 mm are added into the fluidized bed 9 through an alkali liquor tank 22 and a seed crystal storage tank 23 which are communicated with the fluidized bed 9, the garnet is added for 1 time a day, the concentrated water enters the static mixer 10 after reacting in the fluidized bed 9 to remove a large amount of TDS, and calcium carbonate particles produced by the reaction of the fluidized bed 9 are discharged into a calcium carbonate particle storage tank 12;
7) adjusting the pH value: adding 30L/h HCl with the mass concentration of 30% into the static mixer 10 through the acid liquid tank 24, and adjusting the pH value in the static mixer 10 to obtain wastewater with the wastewater water amount of 5000m3D, TDS is 1677mg/L, and the water enters a water outlet tank 11 for standby;
8) and (3) reflux control: the TDS detection probe 14, the second control valve 16 and the third control valve 17 are respectively connected with the second PLC 15, the TDS upper limit value of the second PLC 15 is set to be 4500mg/L, the TDS lower limit value is set to be 1700 mg/L, the TDS detection probe 14 detects the water outlet quality of the waste water in the water tank 11 and transmits the data to the second PLC 15, the waste water TDS in the step 7 is 1677mg/L and does not reach the set upper limit value, the waste water flows back to the immersed ultrafiltration membrane 2 through the three-way pipe 11-1 and the third control valve 17 and is mixed with the raw water, the backflow flow is detected through the flow meter 18, the data is transmitted to the first PLC 19, the first PLC 19 controls the water inlet amount of the first control valve 1, and the water amount entering the immersed ultrafiltration membrane 2 is kept to be the same as the initial water amount, namely 25000m3/d；
9) And (3) first circulation treatment: 20000m raw water3D and 5000m of returned wastewater3After mixing, the TDS of the mixed water is 792mg/L, the mixed water enters an immersed ultrafiltration membrane 2, the step 2-7 is repeated, after the first circulation, the TDS of the concentrated water in the step 5 is 3901mg/L, the TDS of the waste water in the step 7 is 2340mg/L, the waste water does not reach the set upper limit value, the waste water flows back to the immersed ultrafiltration membrane 2 through a three-way pipe 11-1 and a third control valve 17, and is mixed with the raw water to carry out the second circulation treatment;
10) and (3) second circulation treatment: 20000m raw water3D and 5000m of wastewater refluxed after first circulation treatment3D, after mixing, enabling mixed water to enter an immersed ultrafiltration membrane 2 with TDS of 1102mg/L, repeating the step 2-7, after the second circulation, enabling the TDS of the concentrated water in the step 5 to be 5449mg/L, enabling the TDS of the waste water in the step 7 to be 3270mg/L, and enabling the waste water not to reach the set valueThe wastewater with the upper limit value flows back to the immersed ultrafiltration membrane 2 through the three-way pipe 11-1 and the third control valve 17, is mixed with the raw water, and is subjected to third circulation treatment;
11) and (3) third circulation treatment: 20000m raw water3D and 5000m of wastewater refluxed after the second circulation treatment3After mixing, the mixed water TDS is 1535mg/L, the mixed water enters an immersed ultrafiltration membrane 2, the step 2-7 is repeated, after the third circulation, the TDS of the concentrated water in the step 5 is 7617mg/L, the TDS of the waste water in the step 7 is 4570mg/L, the waste water exceeds the set upper limit value, a second PLC (programmable logic controller) 15 controls a third control valve 17 to be closed, meanwhile, a second control valve 16 is opened, the waste water in a water outlet tank 11 is discharged through a three-way pipe 11-1 and the second control valve 16, and the waste water is mixed with the raw water and then discharged to a town sewer;
12) resetting the third control valve: after wastewater discharge treatment, the flowmeter 18 detects no backflow, the first PLC 19 controls the water inflow of the first control valve 1 to 25000m3And d, the raw water enters the immersed ultrafiltration membrane 2, the steps 2-7 are repeated, the TDS detection probe 14 detects the effluent quality of the wastewater in the water tank 11, the data are transmitted to the second PLC 15, the TDS content of the wastewater is 1677mg/L and is smaller than the lower limit value, the second PLC 15 controls the third control valve 17 to be opened, the second control valve 16 is closed at the same time, the wastewater flows back to the immersed ultrafiltration membrane 2, and the circulation treatment is continued until the raw water treatment is completed.
The scale inhibitor in the step 3 is scale inhibitor ME220, and the reducing agent is sodium bisulfite (NaHSO)3）。
In order to ensure better implementation effect, the immersed ultrafiltration membrane 2 is an LJ2C-2000-PF type immersed ultrafiltration membrane, the nanofiltration membrane 7 is an NF90-400/34i type nanofiltration membrane, and the fluidized bed 9 is a D =1.6m granulation fluidized bed.
The outlet of the immersed ultrafiltration membrane 2 is communicated with the air outlet of the blower 20 and is used for matching with backwash water to carry out air oscillation and bubble scrubbing on the outer wall of the hollow fiber and remove pollutants on the surface of the membrane.
The filtered raw water in the ultrafiltration water production tank 3 is communicated with a backwashing outlet of the immersed ultrafiltration membrane 2 through a backwashing pump 21, enters the inner side of the hollow fiber membrane, and is reversely cleaned from inside to outside to clean impurities in the immersed ultrafiltration membrane 2.
In the backwashing process of the immersed ultrafiltration membrane 2, backwash liquid is ultrafiltration production water in the ultrafiltration production water tank 3, namely filtered raw water enters the inner side of the hollow fiber membrane from an outlet of the immersed ultrafiltration membrane through a backwash pump 21 and is reversely cleaned from inside to outside, meanwhile, compressed air generated by an air blower 20 is added to the bottom of the immersed ultrafiltration membrane to perform air oscillation and bubble scrubbing on the outer wall of the hollow fiber, the compressed air rises in a space between the outer wall of the hollow fiber and a shell of the membrane element and acts together with the backwash water to clean pollutants on the surface of the membrane, and the cleaned sewage is discharged from the bottom of a membrane tank.
It should be noted that, all the components involved in the above steps are prior art and commercially available products, and the above description of the embodiments of the present invention is only used to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, based on the idea of the present invention, there may be variations in the specific embodiments and application ranges, and in summary, the present disclosure should not be construed as a limitation of the present invention, and the equivalent embodiments that can be changed or modified by the above-disclosed technical contents fall within the protection scope of the present invention without departing from the technical scope of the present invention.
According to the above embodiment and production needs, in the case of meeting the requirement of the standard of quality of water discharged from the urban sewer for wastewater discharge (CJ 343-2010) on the grade of the quality of water discharged from the urban sewer, the soluble solid content (TDS) should not exceed 2000mg/L (grade C), the number of reflux cycles is adjusted as follows:
(1) the prior art is as follows: when the invention is not adopted, the wastewater is discharged to 7800m3D, wherein the membrane treatment system discharges 5000m of wastewater3D, blending raw water 2800m3D, the total recovery rate of the system is 72 percent;
(2) the system does not perform a reflux cycle: the system effluent can be directly discharged to urban sewers, and the discharge of wastewater under the working condition is 5000m3D, wherein the membrane treatment system discharges 5000m of wastewater3D, no-blending raw water, systemThe total recovery rate is 80 percent, the total recovery rate of the system is improved to 8 percent, and the raw water is saved by about 2800m3D, production cost of about 12300 yuan/d (calculated according to local water price);
(3) the system is refluxed and circulated once: the system effluent needs to be mixed with raw water and then can be discharged to urban sewers, and the wastewater discharge under the working condition is 3100 m3The wastewater discharge of the membrane treatment system is 2500m3D, mixing raw water 600m3D, the total recovery rate of the system is 87 percent, the total recovery rate of the system is improved to 15 percent, and raw water is saved by 4700m3D, the production cost is about 20700 yuan/d (calculated according to the local water price);
(4) the system is refluxed and circulated twice: the system effluent needs to be mixed with raw water and then can be discharged to a town sewer, and the wastewater discharge under the working condition is 3134m3D, wherein the membrane treatment system wastewater discharge is 1667m3D, mixing with 1467m of raw water3And d, the total recovery rate of the system is 86 percent, the total recovery rate of the system is improved to 14 percent, and raw water is saved by 4667m3D, the production cost is about 20500 yuan/d (calculated according to the local water price);
(5) the system is refluxed and circulated for three times: the system effluent needs to be blended with raw water and then can be discharged to urban sewers, and the discharge of wastewater under the working condition is 3500 m3D, wherein the membrane treatment system wastewater discharge is 1250m3/d, raw blending water 2250m3And d, the total recovery rate of the system is 85 percent, the total recovery rate of the system is improved to 13 percent, and raw water is saved by 4300m3And d, the production cost is about 18900 yuan/d (calculated according to the local water price).
From the above, when the system circulates once, the total recovery rate of the system is up to 87%, and the raw water flow is 25000m3Calculated by/d, the water consumption for production can be saved by 170 more than ten thousand m at most in one year3740 ten thousand yuan can be practiced thrift to the cost, calcium carbonate granule through fluidized bed granulation simultaneously has very high economic value, realize waste utilization, fine solution waste water not up to standard, the problem of unable emission, backward flow circulation handles, must lead to the fact raw water and waste water in TDS constantly to rise, control backward flow and discharge through the PLC controller, make TDS content reach dynamic balance in raw water and the waste water, both reduced the waste water discharge, practiced thrift the raw water volume of getting again, effectively solve the raw water volume of gettingThe method solves the problem of wastewater treatment in a membrane treatment system, reduces the content of soluble total solids in the wastewater, achieves the aim of direct discharge, reduces the pollution to the environment, really realizes energy conservation and environmental protection, improves the water yield of membrane treatment, and has remarkable social and economic benefits.

Claims (5)

1. A method of treating wastewater in a membrane treatment system, comprising the steps of:
1) pretreatment: setting a first PLC (programmable logic controller) (19) and a second PLC (15), controlling a first control valve (1) and a third control valve (17) to be in an open state by the first PLC (19) and the second PLC (15), and enabling raw water to enter an immersed ultrafiltration membrane (2) through a water inlet pipe;
2) removing impurities: raw water passes through the membrane wall from the outer side of the hollow fiber membrane in the immersed ultrafiltration membrane (2) through siphoning to remove colloid, bacteria, microorganisms and suspended matter impurities, and the filtered raw water enters the ultrafiltration water production tank (3);
3) and (3) pressurized reaction: raw water in the ultrafiltration water production tank (3) enters a nanofiltration water inlet pump (4) through a water outlet, is pressurized to 0.3Mpa through the nanofiltration water inlet pump (4), a scale inhibitor ME220 with the mass concentration of 10% and sodium bisulfite with the mass concentration of 10% are continuously added into a water inlet pipeline of a security filter respectively through a scale inhibitor adding tank (25) and a reducing agent adding tank (26), the adding amount of the scale inhibitor ME220 and the reducing agent ME and the adding amount of the reducing agent ORP are both 3-5 ppm of the volume of the raw water, and the raw water enters the security filter (5) after undergoing a chain reaction with the ORP of the raw water;
4) filtering by a cartridge filter: raw water entering a cartridge filter (5) is filtered, so that SDI in the filtered raw water is less than or equal to 5, and the filtered raw water enters a high-pressure pump (6) to be pressurized to 0.6Mpa and then enters a nanofiltration membrane (7);
5) removing inorganic ion substances: raw water entering the nanofiltration membrane (7) is filtered in the nanofiltration membrane (7) to remove inorganic ions, bacteria, viruses and organic matters, produced water treated by the nanofiltration membrane (7) enters a water production tank (13) to be delivered as a product, and concentrated water enters a concentrated water tank (8);
6) fluidized bed reaction: concentrated water in the concentrated water tank (8) enters a fluidized bed (9) through a pipeline, 50L/h of alkali liquor with the mass concentration of 30% and 25kg/d of seed crystals with the particle size of 0.1-0.25 mm are added into the fluidized bed (9) through an alkali liquor tank (22) and a seed crystal storage tank (23) which are communicated with the fluidized bed (9), the seed crystals are added for 1 time a day, the concentrated water enters a static mixer (10) after reacting in the fluidized bed (9) to remove a large amount of TDS, and calcium carbonate particles produced by the reaction of the fluidized bed (9) are discharged into a calcium carbonate particle storage tank (12);
7) adjusting the pH value: adding 30L/h acid liquor with the mass concentration of 30% into the static mixer (10) through the acid liquor tank (24), adjusting the pH value in the static mixer (10) to obtain waste water, and feeding the waste water into the water outlet tank (11) for later use;
8) and (3) backflow control: the TDS detection probe (14), the second control valve (16) and the third control valve (17) are respectively connected with the second PLC (15), the upper limit value and the lower limit value of the TDS of the second PLC (15) are set, the TDS detection probe (14) detects the quality of the effluent of the wastewater in the effluent tank (11), the data are transmitted to the second PLC (15), if the TDS of the wastewater does not reach the upper limit value, the effluent flows back to the immersed ultrafiltration membrane (2) through the three-way pipe (11-1) and the third control valve (17) and is mixed with the raw water, the backflow flow is detected through the flow meter (18), the data are transmitted to the first PLC (19), the first PLC (19) controls the water inflow of the first control valve (1), and the water amount entering the immersed ultrafiltration membrane (2) is kept to be the same as the initial raw water amount;
9) and (3) cyclic treatment: mixing the backflow and raw water, entering an immersed ultrafiltration membrane (2), repeating the step 2-7, if a TDS detection probe (14) detects that the effluent quality of the wastewater in an effluent tank (11) exceeds an upper limit value, controlling a third control valve (17) to close by a second PLC (15) and simultaneously opening a second control valve (16), discharging the wastewater in the effluent tank (11) through a three-way pipe (11-1) and the second control valve (16), and discharging the wastewater after being blended with the raw water to a town sewer;
10) resetting the third control valve: after the wastewater in the step 9 is discharged and treated, the flow meter (18) detects that no backflow exists, the first PLC (19) controls the water inflow of the first control valve (1), it is guaranteed that the amount of raw water entering the immersed ultrafiltration membrane (2) is the same as that of the raw water in the step 1, the raw water enters the immersed ultrafiltration membrane (2), the step 2-7 is repeated, the TDS detection probe (14) detects the effluent quality of the wastewater in the water outlet tank (11), data is transmitted to the second PLC (15), the TDS content of the wastewater is smaller than a lower limit value, the second PLC (15) controls the third control valve (17) to be opened, the second control valve (16) is closed, the wastewater flows back to the immersed ultrafiltration membrane (2), and the raw water circulation treatment is continued until the treatment is completed.
2. The method for treating wastewater in a membrane treatment system according to claim 1, wherein the alkali solution in step 6 is a sodium hydroxide solution having a mass concentration of 30%, the seed crystal is garnet, and the acid solution in step 7 is hydrochloric acid having a mass concentration of 30%.
3. The method for treating wastewater in a membrane treatment system according to claim 1, wherein the submerged ultrafiltration membrane (2) is an LJ2C-2000-PF type submerged ultrafiltration membrane, the nanofiltration membrane (7) is an NF90-400/34i type nanofiltration membrane, and the fluidized bed (9) is a D =1.6m granulation fluidized bed.
4. The method for treating wastewater in a membrane treatment system according to claim 1, wherein the outlet of the submerged ultrafiltration membrane (2) is communicated with the air outlet of the blower (20) to cooperate with backwash water to perform air oscillation and bubble scrubbing on the outer wall of the hollow fiber to remove contaminants on the membrane surface.
5. The method for treating wastewater in a membrane treatment system according to claim 1, wherein the filtered raw water in the ultrafiltration water production tank (3) is communicated with a backwashing outlet of the submerged ultrafiltration membrane (2) through a backwashing pump (21), enters the inner side of the hollow fiber membrane, and is reversely cleaned from inside to outside to clean impurities in the submerged ultrafiltration membrane (2).
CN202010333382.5A 2020-04-24 2020-04-24 Wastewater treatment method in membrane treatment system Active CN111285510B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108773964A (en) * 2018-06-15 2018-11-09 烟台金正环保科技有限公司 A kind of zero-emission of high calcium waste water and method of resource
CN110963605A (en) * 2019-12-10 2020-04-07 复旦大学 Backwashing wastewater treatment and recycling system for water supply plant
CN111039453A (en) * 2019-12-23 2020-04-21 烟台金正环保科技有限公司 System and method for treating wastewater containing high-concentration calcium sulfate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108773964A (en) * 2018-06-15 2018-11-09 烟台金正环保科技有限公司 A kind of zero-emission of high calcium waste water and method of resource
CN110963605A (en) * 2019-12-10 2020-04-07 复旦大学 Backwashing wastewater treatment and recycling system for water supply plant
CN111039453A (en) * 2019-12-23 2020-04-21 烟台金正环保科技有限公司 System and method for treating wastewater containing high-concentration calcium sulfate

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