CN101693584A - Water recycling device in artificial wetland organic industrial water with high concentration - Google Patents

Abstract

A water reuse device for high-concentration organic industrial water in constructed wetlands, including a grit chamber, a grid, a water collection neutralization tank, a submersible mixer, a primary sewage pump, a hydrolysis regulating tank, a secondary sewage pump, a UASB reactor, and a three-phase Separator, water distributor, anaerobic filter, anaerobic filler, blower, aerobic filler, aerator, biological contact oxidation tank, secondary sedimentation tank, driving sludge scraper, sludge tank, sludge pump, sewage Mud concentration tank, thick slurry pump, belt filter press, hydrolysis filler, disinfection tank, chlorine injection pump, chlorine injection device, chlorine dioxide generator, monitor, artificial wetland, the present invention can be widely used in various high concentration In the organic wastewater reclaimed water reuse system, it has the characteristics of low investment, stable operation, resource utilization, and low operating cost.

Description

A water reuse device for high-concentration organic industrial water in constructed wetlands

technical field

The invention belongs to the field of sewage treatment, and in particular relates to a water reuse device for artificial wetland organic industrial water.

Background technique

my country is a country with severe drought and water shortage. The total amount of fresh water resources is 2.8 trillion cubic meters, accounting for 6% of global water resources, ranking fourth in the world after Brazil, Russia and Canada, but the per capita is only 2,300 cubic meters, which is only 1/4 of the world average. 1/5 of the United States, ranking 121st in the world, is one of the 13 countries with the poorest per capita water resources in the world, and the distribution of water resources in regions is extremely uneven, and the contradiction between water supply and demand is very prominent. Reuse of reclaimed water is one of the main ways to utilize sewage water resources. At present, my country's reclaimed water reuse has just started, the treatment technology is relatively backward, and the operation cost is relatively high. In particular, the reuse rate of high-concentration organic matter water is very low, and it is almost discharged after simple treatment.

Contents of the invention

The purpose of the present invention is to provide a water reuse device for high-concentration organic industrial water in artificial wetlands, which can meet the water quality requirements of reclaimed water after deep purification of high-concentration organic industrial water, and at the same time reuse, greatly saving water resources.

The high-concentration organic industrial water mentioned in the present invention refers to organic waste water with organic pollutant concentration (CODcr>5000mg/L).

In order to achieve the above object, the artificial wetland high-concentration organic industrial water reuse device provided by the present invention mainly includes:

The grit chamber is connected to the grid, and the supernatant of the grit chamber flows into the grid, and the organic matter in the supernatant is filtered by the grid; the water collection and neutralization tank is used to adjust the pH of the sewage flowing into the grid; After neutralization, the sewage in the pool flows into the hydrolysis regulating tank filled with hydrolysis packing (polyethylene soft packing), which anaerobically decomposes the macromolecular organic matter in the sewage into small particle organic matter; the sewage flows from the hydrolysis regulating pool to the UASB (upflow (type sludge anaerobic reaction) reactor, further anaerobic decomposition of organic matter; after further anaerobic decomposition of organic matter, the sewage flows into the anaerobic filter filled with anaerobic filler to further remove organic matter, and then flows to the anaerobic filter filled with The biological contact oxidation tank of aerobic filler and aerator removes refractory organic matter (aerobic filler and anaerobic filler of the present invention all adopt polyethylene soft filler); the sewage in the biological contact oxidation tank flows into the secondary sedimentation tank, The particles sink to the bottom of the secondary settling tank to form sludge; the upper part of the secondary settling tank is equipped with a sludge scraper to collect the sludge at the bottom of the secondary settling tank, and transport it to the first sludge tank for preliminary mud-water separation, and then to the second sludge tank for further processing Concentration; the concentrated sludge is poured into the filter press for mud-water separation; the sewage after removing the sludge in the secondary settling tank flows into the disinfection tank for disinfection, and then flows into the constructed wetland.

In the artificial wetland high-concentration organic industrial water reuse device of the present invention, a submersible mixer and a sewage pump for transporting sewage to the hydrolysis adjustment tank are provided in the water collecting tank.

In the artificial wetland high-concentration organic industrial water reuse device of the present invention, the UASB reactor is provided with a three-phase separator and a water distributor; wherein: the three-phase separator is used to separate water, gas, and machine solid waste, and distribute water The device makes the water distribution in the three separators even.

In the artificial wetland high-concentration organic industrial water reuse device of the present invention, the aerator installed in the biological contact oxidation tank is connected to the blower through a pipeline.

In the artificial wetland high-concentration organic industrial water reuse device of the present invention, the mud scraper installed on the upper part of the secondary sedimentation tank is a driving type mud scraper, and the collected sludge is transported to the sludge tank through the sludge pipeline.

In the water reuse device for high-concentration organic industrial water in artificial wetlands of the present invention, the filter press for separating mud and water is a belt filter press.

In the artificial wetland high-concentration organic industrial water reuse device of the present invention, the disinfectant in the disinfection pool is prepared by a chlorine dioxide generator.

The invention has strong pretreatment ability, small wetland area and high purification efficiency for pollutants.

The invention can be widely used in various high-concentration organic waste water reuse systems, and has the characteristics of low investment, stable operation, resource utilization, and low operating costs.

Description of drawings

Fig. 1 is a schematic diagram of a water reuse device for organic industrial water in constructed wetlands of the present invention.

The main signs and symbols in the attached drawings:

Grit chamber 1, grid 2, water collection neutralization tank 3, submersible mixer 4, primary sewage pump 5, hydrolysis regulating tank 6, secondary sewage pump 7, UASB reactor 8, three-phase separator 9, water distributor 10. Anaerobic filter 11, anaerobic filler 12, blower 13, aerobic filler 14, aerator 15, biological contact oxidation tank 16, secondary sedimentation tank 17, driving type mud scraper 18, sludge tank 19, sewage Sludge pump 20, sludge concentration tank 21, thick slurry pump 22, belt filter press 23, hydrolysis filler 24, disinfection tank 25, chlorine injection pump 26, chlorine injection device 27, chlorine dioxide generator 28, monitor 29 30. Constructed wetlands.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

The organic industrial water of the present invention is high-concentration organic sewage. After the coarse particles in the sewage are deposited in the grit chamber 1, the supernatant flows into the grid 2, where the fine-particle organic matter will be further filtered. Then the sewage flows into the collection water neutralization pool 3, where the pH of the sewage is adjusted to provide a basis for subsequent biochemical reactions. A submersible mixer 4 and a primary sewage pump 5 are arranged in the water collection neutralization pool 3 . After the sewage is neutralized in the water collection neutralization tank 3, it flows into the hydrolysis adjustment tank 6, and the macromolecular organic matter in the sewage is anaerobically decomposed into small particle organic matter, and at the same time, part of methane is produced. Hydrolysis filler 24 is installed in the hydrolysis regulating tank. After the sewage flows out from the hydrolysis regulating tank, it is lifted into the UASB reactor 8 by the secondary sewage pump 7 . The UASB reactor 8 is provided with a three-phase separator 9 and a water distributor 10 . Wherein the three separators 9 mainly separate water, gas and machine solid waste. The water distributor 10 ensures that the water distribution in the three-item separator 9 is even. In the UASB reactor 8, a large amount of organic matter is anaerobically decomposed and discharged in the UASB reactor 8 in the form of methane gas. The degraded organic matter then flows into the anaerobic filter tank 11, and anaerobic filler 12 (polyethylene soft filler type) is installed in the anaerobic filter tank 11. The organic matter is further removed in the anaerobic filter 11, and then flows to the biological contact oxidation tank 16, where the refractory organic matter is removed. Aerobic filler 14 (polyethylene soft filler) and aerator 15 are installed in the biological contact oxidation tank 16 . The aerator is connected to the air blower 13 through a pipeline. After the sewage is treated in the biological contact oxidation tank 16, it flows into the secondary sedimentation tank 17 for clarification. The particles sink to the bottom of the secondary settling tank 17 to form sludge. After the sludge is collected by the driving-type sludge scraper 18, it is transported to the sludge pool 19 through the sludge pipeline, where the sludge undergoes preliminary mud-water separation, and then is transported to the sludge pool 21 by the sludge pump 20 for further concentration. The concentrated sludge is pumped into the belt filter press 23 through the thick slurry pump 22 for sludge-water separation. After being treated by the biological contact oxidation tank 16, the sewage flows into the disinfection tank 25 for disinfection. Disinfection reagent is prepared on-site by chlorine dioxide generator 28. Reagents are added by chlorine injection pump 26 and chlorine injection device 27. The monitor 29 mainly monitors the quality of the water flowing into the wetland. The constructed wetland 30 further processes the water quality, and the treated water can be used as water for flushing toilets, water for green land irrigation, and the like.

The highest concentration (CODcr) of treated organic matter in the present invention reaches 50000mg/L, the treatment rate is as high as 99.9%, and the effluent water quality is only 10mg/L. Wherein the design parameters of the grit chamber 1 are that the effective water depth is 3-5 meters (m), and the residence time is 8-10 hours (h). The design parameters of the water collecting and neutralizing tank 3 are 2.5-3m, and the hydraulic retention time is 9h. The effective water depth of the hydrolysis regulating tank 6 is 5-7m, and the residence time is 20-30h. The effective water depth of the UASB reactor 8 is 5-8m, and the residence time is 30-50h. The effective water depth of the biological contact oxidation pond 16 is 4-5m, and the residence time is 30-40h. The designed effective water depth of the anaerobic filter 11 is 5-7m, and the residence time is 20-30h. The effective water depth of the secondary settling tank 17 is 2.5-3m, and the residence time is 8-10h. The effective water depth of the sludge thickening tank 21 is 2.5-3m. The design parameters of the constructed wetland are 15m ² for treating 1m ³ of sewage, and the net height of the wetland is 0.3-0.5m.

A specific example is as follows:

The water body is designed as an industrial water plant, the influent organic pollutant concentration is 6000mg/L, the designed effluent water quality is 20mg/L, and the designed flow rate is 400m ³ /d. The removal efficiencies of organic matter in each process stage are respectively: The rate is 25%, and the effluent water quality is 4500mg/L. The removal rate of organic matter in the hydrolysis regulating tank is 30%, and the effluent water quality index is 3150mg/L. The removal rate of organic matter in the anaerobic tank is 80%, and the effluent quality is 630mg/L. The removal rate of organic matter in the contact oxidation tank is 60%, and the effluent index is 50mg/L. The removal rate of organic matter in the sedimentation tank is 60%, and the effluent index is 20mg/L. The organic matter removal rate of the constructed wetland is 80%, and the effluent index is 4mg/L.

The design parameters of the grit chamber are: the effective water depth of the grit chamber is 4.0m, the underground steel concrete structure, the external dimensions are 12000×3500×4250mm, the effective volume is about 150m ³ , and the hydraulic effective residence time is about 9h. The design parameters of the sump and neutralization tank are effective water depth of 2.7m, underground steel concrete structure, external dimensions of 12000×9000×3000mm, effective volume of about 275m ³ , and hydraulic effective residence time of about 16.5h. The design parameters of the hydrolysis regulating tank are effective water depth of 6.5m, semi-underground steel concrete structure, external dimensions of 12000×5500×7000mm, effective volume of about 400m ³ , and hydraulic retention time of about 24h. The concentration of activated sludge is 5-10g/liter, the volume load is 2.5-3.5Kg/m ³ ·d, and the sludge output is 0.1Kg sludge/KgCOD. The design parameters of the UASB reactor are the effective water depth of 6.7m, the above-ground steel concrete structure, the external dimensions of 12000×11000×7000mm, the effective volume of about 800m ³ , and the hydraulic retention time of about 48h. The activated sludge concentration is 3-5g/liter, the volume load is 1.5-2.0Kg/m ³ ·d, and the sludge output is 0.08Kg sludge/KgCOD. The design parameters of the anaerobic filter are the effective water depth of 5.9m, the above-ground steel concrete structure, the external dimensions of 12000×7500×6200mm, the effective volume of about 500m ³ , and the hydraulic retention time of about 30h. The volume load is 1.5～1.8Kg/m ³ .d, and the sludge output is 0.05Kg sludge/KgCOD. The design parameters of the contact oxidation tank are the effective water depth of 4.5m, the above-ground steel concrete structure, the external dimensions of 12000×12000×5000mm, the effective volume of about 600m ³ , and the hydraulic retention time of about 36h. The concentration of activated sludge is 2-4g/liter, the volume load is 0.6-0.8Kg/m ³ ·d, the sludge output is 0.05Kg sludge/KgCOD, and the water-air ratio is 1:5-10. The design parameter of the secondary settling tank is to remove suspended solids in the sewage, and there is a driving type mud scraper inside.

The effective water depth is 3.2m, the above-ground steel concrete structure, the external dimensions are 12000×4000×3500mm, the effective volume is about 150m ³ , and the hydraulic retention time is about 9h. The design parameters of the mud storage tank are effective water depth of 2.7m, underground steel concrete structure, external dimensions of 6000×5500×3000mm, and effective volume of about 80m ³ . The design parameters of the sludge thickening tank are effective water depth of 5.7m, semi-underground steel concrete structure, external dimensions of 6000×6000×6000mm, and effective volume of about 150m ³ . The designed size of the artificial wetland is 6000m ² and the designed depth is 0.4m.

When the invention is in operation, the effluent index of water quality is far less than 20mg/L, and the removal rate of organic matter is as high as 99%, which meets the water quality requirement of reclaimed water reuse.

Claims (7)

1. water recycling device in the artificial wetland organic industrial water with high concentration mainly comprises:

Settling pit connects grid, and the supernatant liquor of settling pit flows into grid, by grid the organism in the supernatant liquor is filtered;

The neutralization tank that catchments, the sewage that the plaid matching grid current is gone into are made potential of hydrogen and are regulated;

Catchment in the sewage in the neutralization tank and the back flows into the hydrolyzing regulation pond that is filled with polyethylene software filler, it is the small-particle organism that the larger molecular organics in the sewage is carried out anaerobic digestion;

Sewage is made further anaerobic digestion to organism in hydrolyzing regulation pond flow to flow lifting type sludge anaerobic reaction response device;

Sewage behind further anaerobic digestion organism flows into the anaerobic filter that is filled with polyethylene software filler, with further removal organism, then flow to the biological contact oxidation pond that is filled with polyethylene software filler and aerator, the organism of difficult degradation is removed;

The sewage of biological contact oxidation pond flows into second pond, and particulate matter is sunken to the second pond bottom and forms mud;

Second pond top is provided with mud scraper, collects second pond bottom mud, and is delivered to first sludge sump and carries out preliminary mud-water separation, concentrates to second sludge sump again; Mud after concentrating is squeezed into pressure filter and is carried out mud-water separation;

After sewage inflow sterilization pool in the second pond behind the removal mud carries out disinfection, flow into artificial swamp.

2. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1 wherein, is provided with diving mixer in the neutralization tank that catchments, and is used for the sump pump of sewage transport to hydrolyzing regulation pond.

3. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1 wherein, is provided with triphase separator and water distributor in the UASB reactor; Wherein:

Three separators are that water, gas, machine solid waste are separated, and water distributor makes the water distribution in three separators even.

4. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1, wherein, the aerator of installing in the biological contact oxidation pond is by the pipe connection gas blower.

5. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1, wherein, the mud scraper that second pond top is provided with is the running type mud scraper, the mud of collection is delivered to sludge sump by sludge pipe.

6. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1, wherein, the pressure filter that carries out mud-water separation is a belt filter press.

7. water recycling device in the artificial wetland organic industrial water with high concentration as claimed in claim 1, wherein, the sterilizing agent in the sterilization pool is to be prepared by chlorine dioxide generator.

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