CN115124160A

CN115124160A - Riverway water quality bypass purification treatment process

Info

Publication number: CN115124160A
Application number: CN202210420573.4A
Authority: CN
Inventors: 赵明杰; 汪佳慧; 栗勇田; 张兆祥; 孙浩楠; 刘晓晓; 赵恰
Original assignee: Qinhuangdao Tianda Environmental Protection Research Institute Co ltd
Current assignee: Qinhuangdao Tianda Environmental Protection Research Institute Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-09-30

Abstract

A riverway water quality bypass purification treatment process comprises a water inlet channel, an integrated pump station, a rotational flow grit chamber, a pipeline mixer, a micro-vortex flocculation tank and a cloth filter; the water inlet channel is communicated with a river channel; the water inlet of the integrated pump station is communicated with the water inlet channel; a cyclone separation section with a circular cross section is arranged in the cyclone grit chamber, a water inlet pipe is arranged in the tangential direction of the cyclone separation section, and the water inlet pipe is communicated with a water outlet of the integrated pump station; the middle part in the cyclone grit chamber is provided with a rotary impeller, the cyclone separation section is provided with a water outlet, and the rotary impeller is in driving connection with a motor; the pipeline mixer is communicated with a water outlet of the rotational flow grit chamber through a pipeline; the water inlet of the micro-vortex flocculation tank is communicated with the water outlet of the pipeline mixer through a pipeline; the water inlet of the cloth filter is communicated with the water outlet of the micro-vortex flocculation tank through a pipeline; the invention mainly aims at the problems of high concentration of organic pollutants and algae in river water, deterioration of water quality and the like in summer and autumn of rural river channels, and adopts a combined process taking reinforced coagulation and a cloth filter as cores to purify the water quality of a bypass.

Description

Riverway water quality bypass purification treatment process

Technical Field

The invention relates to a riverway water quality bypass purification combined device and a treatment process, and belongs to the technical field of sewage treatment.

Background

With the comprehensive implementation of 'river growth' and the happy construction of beautiful villages, the black and odorous water treatment in rural areas of China is greatly developed, and the water quality of the river is obviously improved. However, comprehensive treatment and long-term maintenance of river water environment are long-term and complex system engineering, and due to the reasons that village and town sewage collection and treatment facilities are incomplete, agricultural non-point source pollution is aggravated, a long-term management and protection mechanism is lacked after black and odorous water body treatment and the like, water eutrophication and algae bloom phenomena occur frequently, and river water quality is prone to severe fluctuation.

The traditional river water quality improving technology comprises methods of water regulating engineering, in-situ ecological restoration, artificial aeration reoxygenation and the like, wherein the inhibiting mechanism of the water regulating engineering on the growth of algae mainly lies in scouring and diluting effects, the river water body flow velocity is higher than the phytoplankton growth critical flow velocity by formulating reasonable water regulating period and scientific drainage measures, and the river pollution release, storage regulation and self-purification capacity is improved, so that the river water quality is controlled. The in-situ ecological restoration is mainly realized by arranging an ecological floating bed and a biological membrane on the polluted river surface, and absorbing nitrogen and phosphorus nutritive salt and organic pollutants in water by using plant roots and microorganisms as nutritive substances required by growth and propagation, so that the aim of purifying water quality is fulfilled. Above traditional river course quality of water promotion technique all has certain purifying effect, but also has the problem that the construction degree of difficulty is big, the pollutant gets rid of inefficiency, running cost height respectively, and is difficult to effectively deal with the burst situations such as section quality of water exceeds standard in the short-term. Therefore, by adopting engineering technical measures which are suitable for local conditions, the water quality of the river channel is timely and efficiently improved, and the method has practical significance.

The novel physicochemical water quality purification technology mainly realizes the high-efficiency water purification effect by adding a physical and chemical agent and applying a novel water treatment equipment process, such as the methods of coagulating sedimentation, dosing air flotation, filter cloth filter deep purification and the like, and has the advantages of high treatment efficiency, stable effluent quality, high automation degree and the like, thereby having wide application prospect in the river eutrophication water body purification project. By constructing an ex-situ purification treatment project and adopting a combined process with reinforced coagulation and a cloth filter as a core to improve the water quality of the river, reference can be provided for the application of emergency guarantee and promotion technology of the water quality of the river in rural areas.

Disclosure of Invention

The invention aims to provide a riverway water quality bypass purification treatment process.

In order to achieve the above objects and other related objects, the present invention provides the following technical solutions: a riverway water quality bypass purification treatment process comprises a water inlet channel, an integrated pump station, a rotational flow grit chamber, a pipeline mixer, a micro-vortex flocculation tank and a cloth filter;

the water inlet channel is communicated with a river channel;

the water inlet of the integrated pump station is communicated with the water inlet channel;

a cyclone separation section with a circular cross section is arranged in the cyclone grit chamber, a water inlet pipe is arranged in the tangential direction of the cyclone separation section, and the water inlet pipe is communicated with a water outlet of the integrated pump station; the middle part in the cyclone grit chamber is provided with a rotary impeller, the cyclone separation section is provided with a water outlet, and the rotary impeller is in driving connection with a motor;

the pipeline mixer is communicated with a water outlet of the rotational flow grit chamber through a pipeline;

the water inlet of the micro-vortex flocculation tank is communicated with the water outlet of the pipeline mixer through a pipeline;

the water inlet of the cloth filter is communicated with the water outlet of the micro-vortex flocculation tank through a pipeline;

the treatment process comprises the following steps: the method comprises the following steps that firstly, a water body of a river channel automatically flows into an integrated pump station through a water inlet channel, the water body is lifted into a rotational flow grit chamber through a water pump in the integrated pump station, the water body tangentially enters the rotational flow grit chamber through a water inlet, a rotary impeller is driven by a motor to rotate to generate rotational flow, under the action of gravity and centrifugal force, sand grains in the water body slide into the bottom of the rotational flow grit chamber along the wall of the rotational flow grit chamber, sewage overflows from a water outlet, fully mixes with a coagulating agent through a pipeline mixer, then enters a microvovtex flocculation tank, and is subjected to flocculation sedimentation to remove colloid, flocculate, adsorbed organic matters and nitrogen and phosphorus, and meanwhile, part of soluble organic matters are removed through the redox action of a composite agent; the effluent of the micro-vortex flocculation tank enters a filter cloth filter tank, solid suspended matters are intercepted outside filter cloth fibers through micro-porous filter cloth fixed on a support, and filtrate is discharged out of the filter tank through an overflow groove after being collected by a hollow pipe and automatically discharged back to a river channel through an outlet channel.

The preferable technical scheme is as follows: also comprises a sludge concentration tank; the sludge inlet of the sludge concentration tank is communicated with the sludge discharge channel at the bottom of the micro-vortex flocculation tank and the sludge discharge channel at the bottom of the cloth filter tank through pipelines, and sludge in the sludge concentration tank is subjected to sludge-water separation by means of gravity.

The preferable technical scheme is as follows: the sludge screw pump is characterized by further comprising a sludge screw pump, a sludge inlet of the sludge screw pump is communicated with the sludge concentration tank, and a sludge outlet of the sludge screw pump is communicated with a sludge dewatering system.

The preferable technical scheme is as follows: the sludge screw pump is characterized by further comprising an intermediate tank, and a water inlet of the intermediate tank is communicated with a liquid outlet of the sludge screw pump through a pipeline.

The preferable technical scheme is as follows: the cyclone sand basin comprises a cyclone sand basin body, a cyclone sand basin body and a cyclone sand basin, and is characterized by further comprising a sand washing pipe, wherein one end of the sand washing pipe is communicated with an air outlet of a fan, and the other end of the sand washing pipe extends to the bottom of the cyclone sand basin body.

The preferable technical scheme is as follows: the sand-water separator is characterized by further comprising an air stripping pipeline, a sand hopper is arranged at the bottom of the cyclone sand basin, one end of the air stripping pipeline extends to the sand hopper, and the other end of the air stripping pipeline is communicated with the sand-water separator.

Due to the application of the technical scheme, compared with the prior art, the invention has the advantages that:

1. the invention has the advantages of high treatment efficiency and large treatment capacity. The coagulant can accelerate the generation and sedimentation process of flocs and reduce the concentration of organic pollutants through chemical reaction; the cyclone separation system integrates multiple functions of mixing water treatment agents, separating river sand, sand and water, reducing subsequent flocculation precipitation and depth filtration treatment load of the cloth filter, shortening sewage treatment time, and meeting the requirement of larger treatment capacity through parallel operation of a plurality of purification devices.

2. The invention has the advantages of small occupied area of the project and short construction period. Compared with the traditional water quality improving processes such as coagulating sedimentation, artificial wetland and the like, the combined process has short flow and few auxiliary equipment, and can effectively save the occupied area by reasonable arrangement. The main processing units are mostly assembled on the site by complete equipment, so that the civil engineering content is greatly reduced, the construction period is shortened, and the engineering construction cost and the land rental cost are effectively saved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

FIG. 2 is a schematic view of the apparatus of the present invention.

Fig. 3 is a schematic diagram of a microvovtex flocculation basin.

FIG. 4 shows the effect of the system purification means on removing COD, TP and turbidity ((a) the effect of the system purification means on removing COD, (b) the effect of the system purification means on removing TP, and (c) the effect of the system purification means on removing turbidity).

FIG. 5 is a schematic diagram of an integrated pumping station.

FIG. 6 is a schematic diagram of a cloth media filter.

FIG. 7 is a schematic view of a sludge dewatering system.

In the above drawings: 1. a water inlet channel; 2. an integrated pump station; 3. a rotational flow grit chamber; 4. a pipeline mixer; 5. a micro-vortex flocculation tank; 6. a cloth filter; 7. a sludge concentration tank; 8. a sludge screw pump; 9. a sludge dewatering system; 10. an intermediate tank; 11. A sand-water separator.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1-7. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are provided for a better understanding of the present invention, and are not intended to limit the invention. The experimental procedures in the following examples are all conventional ones unless otherwise specified. The experimental materials used in the following examples were all purchased from a conventional biochemical laboratory unless otherwise specified.

Example 1: riverway water quality bypass purification treatment process

Overview of engineering

The drinking horse river originates from double towns in Lulong county, flows through 7 villages and towns in Changli county from west to east, converges into Bohai sea in great cattail river, the whole length of a river reach is 34km in the Changli county, the drainage basin area is 142.8km2, an upstream water source is basically dry, and river water mainly comes from drainage of a plurality of agricultural product processing enterprises and centralized sewage treatment plants along the river. In recent years, with the rise of water consumption of enterprises and residents, sewage treatment plants are operated in an overload mode for a long time, and in addition, rain and sewage mixed connection and initial rain runoff of a drainage system of an industrial park, pollutants in a river water body are accumulated continuously, particularly, the concentration of algae and various pollutants in river water is remarkably increased in summer and autumn, and the water quality of a downstream exit section exceeds the standard continuously.

In order to ensure that the water quality of the outfield section of the drinkable horse river meets related requirements, a local environmental protection department plans to establish a water retaining dam at a proper position at the upstream of the outfield section through engineering measures on the basis of strictly controlling the source, perform ex-situ purification on river water and then replenish the river, perform ecological restoration on a river bank and a river surface, reduce non-point source pollution, further improve the water purification capacity, ensure that the runoff is conveyed to the area of the outfield section, and ensure that the water quality is continuously, stably and up to the standard, and introduce and analyze the process design of the ex-situ purification engineering of the river water body, the water quality improvement effect and the operation condition.

Secondly, designing the water quality and the water quantity

By analyzing water quality monitoring data of the exit point section of Changli county of drinking Ma river in recent years, river water is polluted most seriously in 6-8 months and is poor V-class water quality, and main pollutants with large index fluctuation are COD and TP, wherein the mass concentration of the COD is 73.60mg/L at most, the annual average value is 38.30mg/L, the mass concentration of the TP is 1.96mg/L at most, and the annual average value is 0.65 mg/L. In addition, in order to ensure the landscape function of the river and meet the subsequent ecological restoration requirements, the water turbidity is required to be controlled, and the water quality of inlet water and outlet water of the river water ectopic purification project is designed according to the current water quality situation of the drinking mare river and the project target as shown in table 1.

Table 1 designs the quality of inlet and outlet water

According to the river channel site conditions, the treatment effect, the land occupation, the later period management, the energy, the traffic and other factors are comprehensively considered, the north bank at the upstream of the exit monitoring section of 2.5km is determined to be selected as the bypass ex-situ purification point, and the design treatment water amount is 1 multiplied by 10 ⁴ m ³ And d. After the water retaining dam is built, water is taken from the front of the dam and lifted to the shore, and characteristic pollutants in the water body are treated by a centralized purification facility and discharged into a downstream river channel after reaching the standard.

Water quality improvement process for river channel

1. Process flow

According to the hydrological characteristics of the river channel, the current river channel does not have the condition of clear water supply, and river channel dredging and dredging involve large engineering quantity and difficulty in improving the quality of river water in a short period. Aiming at the problems of poor river water quality, vigorous phytoplankton growth and high COD and TP concentrations of a water body in summer and autumn and considering the requirement of controlling the turbidity of the water body, the engineering adopts a reinforced coagulating sedimentation method combined with a cloth filter deep purification process to improve the river water quality, and the process flow is shown in figure 1.

Polluted river water firstly flows into an integrated pump station 2 through an inlet channel 1, and large suspended matters and floating objects are intercepted and separated through a matched mechanical grating. Then lifted to a rotational flow grit chamber 3 through a valve, sewage enters the rotational flow grit chamber tangentially through a water inlet, a rotational impeller at the center of the chamber is driven by a motor to rotate to generate rotational flow, sand grains in river water slide into the bottom of the chamber along the chamber wall under the action of gravity and centrifugal force, the sewage overflows from a water outlet, fully mixes with a coagulating agent through a pipeline mixer 4 and then enters a micro-vortex flocculation tank 5 through the valve, most of colloid, flocculate, organic matters and nitrogen and phosphorus adsorbed on the sewage are removed through a flocculation and sedimentation process, and meanwhile, part of soluble organic matters can be removed through the redox action of a composite agent. Meanwhile, the number of turbulence micro-vortexes in the tank can be increased by arranging the baffle plates in the water flow channel of the micro-vortex flocculation tank, so that the number of times of particle collision in the water body is increased, alum blossom easy to settle is formed, and the flocculation effect is effectively improved. The effluent of the microvovtex flocculation tank 5 enters a filter cloth filter 6 through a valve, and through microporous filter cloth fixed on a support, solid suspended matters are intercepted outside filter cloth fibers, suspended impurities and nitrogen and phosphorus in a water body can be further removed, the concentration of organic pollutants is reduced, along with the accumulation of sludge on the filter cloth, the filter cloth filtration resistance is increased, the liquid level in the tank rises gradually, when the liquid level rises to a set value, a PLC (programmable logic controller) controls to start a reverse suction pump and a transmission device, the sludge in filter cloth micropores is scraped and cleaned, and the filter liquor is collected by a hollow tube and then discharged out of the filter tank through an overflow groove and is automatically discharged back into a river channel through an outlet channel.

Sludge generated by the micro-vortex flocculation tank 5 and the cloth filter 6 is periodically discharged into a sludge concentration tank 7 through an electromagnetic valve through a sludge discharge channel at the bottom of the tank respectively and is subjected to sludge-water separation by virtue of gravity, supernatant enters an intermediate tank 10 through an overflow port, bottom sludge is lifted into a sludge dewatering system 9 through a sludge screw pump 8 for treatment, filter press liquid enters the intermediate tank 10 through a valve, and dewatered sludge cakes are rich in nutrient substances such as nitrogen and phosphorus and can be transported outside for landscaping, soil improvement and the like after aerobic fermentation.

The fan produces the air that has certain pressure, on the one hand carries the bottom of the pool through the sand washing pipeline in the whirl grit chamber to carry out forced aeration and wash, and the impurity and the organic pollutant on further processing sand grain surface, on the other hand promotes the sand water mixture that deposits in the sand fill through the air stripping pipeline and discharges into sand water separator 11 and carry out sand water separation, and the silt granule carries out the outward transportation processing regularly, and the supernatant flows into the intermediate tank through the valve.

The intermediate tank is used as a temporary storage tank for mainly collecting overflow sewage of the sludge concentration tank and the sand-water separator and filter press liquid of a sludge dewatering system, and when the water level in the intermediate tank exceeds the design elevation of a liquid level meter, the intermediate tank is lifted to a rotational flow sand setting tank through a valve by a submersible pump for circular treatment.

2. Technical characteristics of the process

High treatment efficiency and large treatment capacity. The high-efficiency composite coagulant is a liquid preparation compounded by various components such as a coagulant, a coagulant aid, a coupling agent, an oxidant and the like, can accelerate the generation and sedimentation process of flocs, and simultaneously reduces the concentration of organic pollutants through chemical reaction; the cyclone separation system integrates multiple functions of mixing water treatment agents, separating river sand, sand and water, reducing subsequent flocculation precipitation and depth filtration treatment load of the cloth filter, shortening sewage treatment time, and meeting the requirement of larger treatment capacity through parallel operation of a plurality of purification devices.

The engineering occupies small space and the construction period is short. Compared with the traditional water quality improving processes such as coagulating sedimentation, artificial wetland and the like, the combined process has short flow and few auxiliary equipment, and can effectively save the occupied area by reasonable arrangement. The main processing units are mostly assembled on the site by complete equipment, so that the civil engineering content is greatly reduced, the construction period is shortened, and the engineering construction cost and the land rental cost are effectively saved.

Fourth, main processing unit and design parameters

4.1 Integrated Pump station

The cylinder is made of glass fiber reinforced plastic, and the size of the cylinder is phi 3.5 x 5 m. The equipment comprises 2 lifting water pumps, 1 for 1, and 480m of flow ³ The water inlet lifting basket is characterized by comprising a water inlet lifting basket grid net, a ladder stand and a coupling device, wherein the water inlet lifting basket grid net is sleeved with the ladder stand 1, and the lifting basket is made of 304 stainless steel materials, and the lift is 15 m.

4.2 cyclonic separation System

The design treatment scale of the cyclone separation system is 1 multiplied by 10 ⁴ m ³ And d, mainly comprising a medicament adding device, a sand settling device and a sand-water separator. Comprises 2 sets of high-efficiency coagulation medicament adding devices, the adding amount of the medicament is 50mg/L, and the effective volume is set to be 10m ³ 2 add medicine buckets, the PE material, 2 supporting mixers, single power is 1.1kW, add 2 medicine measuring pumps, single maximum flow is 500L/h, the lift is 30m, power is 0.75 kW. 1 air-lift type rotational flow grit chamber, the diameter of the box body is 3.8m, the effective water depth is 3.2m, the box body and the matched stirring and air-lift device are made of stainless steel, the power of the motor is 2.2kW, and the power of the fan is 2.2 kW. 1 sand-water separator, the diameter of the tank body is 0.3m made of stainless steel, the diameter of the blade is 0.26m made of high-strength alloy steel, and the power consumption is 0.37 kW.

The air lifting device consists of a rotary blower, an exhaust electromagnetic valve, a sand washing electromagnetic valve, a sand lifting electromagnetic valve and a pipeline, wherein the rotary blower is arranged on one side of the grit chamber, an air lifting sand lifting pipe and a sand washing pipe are arranged beside the sand discharging pipe, and a compressed air joint required by operation is arranged at the bottom of the rotary blower. The main function of the device is to inject compressed air to the sand washing pipe and the sand lifting pipe by adopting a blower, wash and loosen sand deposited in a sand discharge hopper after long-term shutdown, and press a water/air/sand mixture above a sand discharge straight pipe to ensure that the sand discharge pipe is smooth in operation. The sand-water separator is installed at an inclination angle of 20-30 degrees, sand-water mixed liquid enters the water tank from the water inlet pipe, particles (such as sand) with high specific gravity in the mixed liquid fall and deposit at the bottom of the spiral groove due to self-weight, materials are lifted along the bottom of the inclined groove under the pushing of the spiral, the materials continue to move upwards for a certain distance after leaving the liquid level, water in the sand gradually flows back to the water tank in a gap in the spiral groove, and the sand is gradually dried at the discharge port and falls into other conveying devices by virtue of self-weight. The supernatant liquid continuously flows out from the drain pipe. The purpose of separating sand and water is achieved.

4.3 micro-vortex flocculation tank

The tank body is of an anti-corrosion carbon steel structure, the size of a single tank is 20.0m multiplied by 6.0m multiplied by 4m, and the processing capacity is 1 multiplied by 10 ⁴ m ³ /d。

As shown in figure 3, the micro-vortex flocculation tank is divided into two functional areas, namely a flocculation area and a sedimentation area, by the water inlet direction.

The flocculation area is mainly composed of a guide plate and a micro-vortex reactor component. The flocculation medicament gets into little vortex flocculation basin flocculation area through the water inlet after mixing with the river, by guide plate control rivers direction, there is fixed mounting's little vortex flocculation reactor in the pond, when rivers pass a large amount of holes on little vortex flocculation reactor surface, form a lot of little vortex vortices, it is poor again to have obvious speed inside and outside the reactor, be favorable to the collision contact of flocculus, furthermore, the internal velocity of flow at the reactor is less, the suspension has many mud alum flowers, there is the effect of absorption flocculation to little flocculus, compare in traditional net flocculation reaction, folded plate reaction etc. further shorten the flocculation time, the flocculation effect is better.

The settling zone is divided into a clear water zone, an inclined tube zone, a water distribution zone and a sludge accumulation zone from top to bottom. The design area of the clear water area is 60m ² Height 1.2 m, upward flow velocity 2 mm/s. The water distribution area adopts side water inlet, a rectification grid is arranged at an inlet, water is distributed in a layered slow flow manner, and the height of the water distribution area is 1 m. The honeycomb hexagonal inclined pipe is arranged in the inclined pipe area, the length of the pipe is 1000mm, the thickness of the pipe is 0.4mm, the inner diameter of the pipe is 30mm, the installation horizontal inclination angle is 60 degrees, and the design settling time is 7 min. The height of the sludge discharge hopper in the sludge accumulation area is 0.8m, the sludge is discharged by a siphon type mechanical sludge discharge channel through the bottom of the tank, and clear water overflows along a water outlet and enters the next treatment unit for deep purification.

4.4 Filter cloth Filter

The filter tank body is of a carbon steel structure, is internally coated with epoxy resin for corrosion prevention, has the size of 7.3m multiplied by 2.5m multiplied by 3.0m, and has the single set treatment capacity of 1.5 multiplied by 10 ⁴ t/d. 16 high-efficiency fiber filter discs are arranged, the diameter of each rotary disc is 2000mm, polyester supports and nylon fiber filter cloth are made of the materials, a hollow rotary shaft is formed by welding stainless steel, a hollow pipe can convey clean water and drive the filter discs to rotate, the power of a driving motor is 1.1kW, and the flow of a backwashing pump is 50m ³ H, power 2.2 kW. The matched electrical system consists of electric control elements such as an electric control box, a PLC (programmable logic controller), a liquid level monitor and the like, and is used for controlling the backwashing process and adjusting the backwashing interval.

4.5 sludge dewatering

The sludge amount of the sludge in the sedimentation tank after being concentrated is 30m ³ D, the water content is 97-98%, 1 screw pump is arranged for lifting sludge, and the flow is 20m ³ H, power of 5.5kW, 1 box filter press, body size of 4.8m multiplied by 1.5m, single unit treatment capacity of 2.5m ³ H, the filtration pressure is 1Mpa, and the filter-pressing area is 50m ² The power of the main machine is 1.5kW, the water content of the dewatered mud cake is 70%, and the mud cake is conveyed to a discharging area through a matched belt conveying system and then is periodically transported out for treatment.

Fifth, operational effects

After the process is put into use formally and runs stably for 3 months, water quality monitoring is carried out on the water inlet and the water outlet of the system purification facility in 7 to 9 months, the sampling frequency is 4 times per month, and the treatment effect of main pollutants is shown in figure 4 according to actual measurement data.

As can be seen from FIG. 4, in summer and autumn where the river water pollution is severe, the influent water quality is still poor in the quality of V-class water (COD is greater than or equal to 40mg/L, and TP is greater than or equal to 0.4mg/L) for most of the time. After the on-shore ex-situ purification is carried out by adopting the reinforced coagulating sedimentation and cloth filter deep filtration process, the removal effect of pollutants in river water is shown in figure 4, the removal rates of COD, TP and turbidity of the effluent are 45.56% -54.81%, 74.00% -84.17% and 87.34% -91.41%, the average removal rates are 50.54%, 80.17% and 88.94%, the average effluent mass concentrations are 25.15mg/L, 0.18mg/L and 3.61NTU, the effluent quality reaches the IV-class standard of surface water (COD is less than or equal to 30mg/L, TP is less than or equal to 0.2mg/L), and the sensory quality of river water is obviously improved. The effluent of the combined process has stable quality, obvious removal effect on TP and turbidity in the water body, and higher removal rate on COD in the water body than that of the conventional coagulating sedimentation method, which shows that the ratio of non-soluble organic matters in the river water body is higher, and the reinforced coagulating process also has certain removal effect on the soluble organic matters in the water. The implementation of the process effectively improves the water quality of the river water body in time, is beneficial to improving the existing water ecological environment of the river, maintains the diversity of aquatic organisms and has good environmental benefit.

According to the characteristics of water quality and the treatment requirements of a river course in summer and autumn in a certain rural area, a combined process taking reinforced coagulation and a cloth filter as cores is applied to a river course water quality improvement project in a bypass treatment mode, the removal rate of COD in a water body reaches more than 50%, the removal rate of TP and turbidity reaches more than 80%, the indexes of main pollutants of effluent reach the IV-class standard of surface water, and the sensory quality of river water is remarkably improved. The engineering has the advantages of small floor area, short construction period, stable purification effect, high automation degree of the operation process, simple and convenient maintenance of complete equipment, good economic and environmental benefits, and capability of providing reference and reference for design, construction and operation of similar riverway water quality purification engineering.

Example 2: riverway water quality bypass purification treatment process

A riverway water bypass purification treatment process comprises a water inlet channel 1, an integrated pump station 2, a rotational flow grit chamber 3, a pipeline mixer 4, a micro-vortex flocculation tank 5 and a cloth-filtering tank 6;

the water inlet channel is communicated with a river channel;

the treatment process comprises the following steps: the water body of the river channel automatically flows into the integrated pump station through the water inlet channel, the water body is lifted into the rotational flow grit chamber by a water pump in the integrated pump station, the water body tangentially enters the rotational flow grit chamber through the water inlet, the rotary impeller is driven by the motor to rotate to generate rotational flow, under the action of gravity and centrifugal force, sand grains in the water body slide into the bottom of the rotational flow grit chamber along the wall of the rotational flow grit chamber, sewage overflows from the water outlet, fully mixes with a coagulating agent through the pipeline mixer and then enters the micro-vortex flocculation tank, and colloid, flocculate, adsorbed organic matters and nitrogen and phosphorus are removed through the flocculation and sedimentation process, and meanwhile, part of soluble organic matters are removed through the redox action of the composite agent; the effluent of the micro-vortex flocculation tank enters a filter cloth filter tank, solid suspended matters are intercepted outside filter cloth fibers through micro-porous filter cloth fixed on a support, and filtrate is discharged out of the filter tank through an overflow groove after being collected by a hollow pipe and automatically discharged back to a river channel through an outlet channel.

The preferred embodiment is: also comprises a sludge concentration tank 7; the sludge inlet of the sludge concentration tank is communicated with the sludge discharge channel at the bottom of the micro-vortex flocculation tank and the sludge discharge channel at the bottom of the cloth filter tank through pipelines, and sludge in the sludge concentration tank is subjected to sludge-water separation by means of gravity.

The preferred embodiment is: the sludge screw pump is characterized by further comprising a sludge screw pump 8, a sludge inlet of the sludge screw pump is communicated with the sludge concentration tank, and a sludge outlet of the sludge screw pump is communicated with a sludge dewatering system 9.

The preferred embodiment is: the sewage treatment device also comprises an intermediate tank, wherein a water inlet of the intermediate tank 10 is respectively communicated with a supernatant overflow port of the sludge concentration tank, a liquid outlet of the sand-water separator and a liquid outlet of the sludge screw pump through pipelines.

The preferred embodiment is: the cyclone sand basin comprises a cyclone sand basin body, a cyclone sand basin body and a cyclone sand basin, and is characterized by further comprising a sand washing pipe, wherein one end of the sand washing pipe is communicated with an air outlet of a fan, and the other end of the sand washing pipe extends to the bottom of the cyclone sand basin body.

The preferred embodiment is: the sand-water separator is characterized by further comprising an air stripping pipeline, a sand hopper is arranged at the bottom of the cyclone sand basin, one end of the air stripping pipeline extends to the sand hopper, and the other end of the air stripping pipeline is communicated with the sand-water separator 11.

The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting thereof in any way, and any modifications or variations thereof that fall within the spirit of the invention are intended to be included within the scope thereof.

Claims

1. A riverway water bypass purification treatment process is characterized in that: comprises a water inlet channel, an integrated pump station, a rotational flow grit chamber, a pipeline mixer, a micro-vortex flocculation tank and a cloth filter;

the water inlet channel is communicated with a river channel;

a water inlet of the integrated pump station is communicated with the water inlet channel;

2. The riverway water quality bypass purification treatment process according to claim 1, which is characterized in that: also comprises a sludge concentration tank; the sludge inlet of the sludge concentration tank is communicated with the sludge discharge channel at the bottom of the micro-vortex flocculation tank and the sludge discharge channel at the bottom of the cloth filter tank through pipelines, and sludge in the sludge concentration tank is subjected to sludge-water separation by means of gravity.

3. The riverway water quality bypass purification treatment process according to claim 2, which is characterized in that: the sludge screw pump is characterized by further comprising a sludge screw pump, a sludge inlet of the sludge screw pump is communicated with the sludge concentration tank, and a sludge outlet of the sludge screw pump is communicated with a sludge dewatering system.

4. The riverway water quality bypass purification treatment process according to claim 2, which is characterized in that: the sewage treatment system also comprises an intermediate tank, wherein a water inlet of the intermediate tank is respectively communicated with a supernatant overflow port of the sludge concentration tank, a liquid outlet of the sand-water separator and a liquid outlet of the sludge screw pump through pipelines.

5. The riverway water quality bypass purification treatment process according to claim 1, which is characterized in that: the cyclone sand basin is characterized by further comprising a sand washing pipe, wherein one end of the sand washing pipe is communicated with an air outlet of a fan, and the other end of the sand washing pipe extends to the bottom of the cyclone sand basin.

6. The riverway water quality bypass purification treatment process according to claim 1, which is characterized in that: the sand-water separator is characterized by further comprising an air stripping pipeline, a sand hopper is arranged at the bottom of the cyclone sand basin, one end of the air stripping pipeline extends to the sand hopper, and the other end of the air stripping pipeline is communicated with the sand-water separator.