CN105293820A - Modular integrated process method suitable for cow breeding wastewater treatment - Google Patents

Abstract

The invention particularly relates to a modular integrated process method suitable for the treatment of dairy cow breeding wastewater. Aiming at the problem of high-concentration organic wastewater treatment produced in the breeding process of urban and rural decentralized dairy farms, the process integration and parameter design are carried out. The integrated process It consists of 4 modules: solid-liquid separation module, first-level physical and chemical module, second-level biochemical module, and third-level advanced treatment module. The solid-liquid separation module is a side flow centrifugal filter and cyclone separator; the first-level physical and chemical module is adjusted Hehe flocculation and air flotation function; the second-level biochemical module is equipped with anaerobic sub-module and aerobic sub-module, and the anaerobic sub-module and aerobic sub-module are arranged in series; the third-level advanced treatment module is mainly equipped with active sand filter and ultraviolet disinfection sub-module module, the process of the present invention has the characteristics of flexibility, high efficiency, convenience, intelligence, etc., and can ensure the economical, effective, and stable operation of wastewater treatment facilities.

Description

A Modular Integrated Process Method Suitable for Dairy Farming Wastewater Treatment

technical field

The invention belongs to the technical field of wastewater treatment, and in particular relates to a modular integrated process method suitable for dairy cow breeding wastewater treatment. Aiming at the problem of high-concentration organic wastewater treatment in the breeding process of decentralized dairy farms in urban and rural areas, process integration and parametric design are carried out to realize process modularization, intelligence, and integration.

Background technique

Traditional small-scale dairy cow breeding wastewater can be used as fertilizer for crops. With the acceleration of urbanization and the increase in demand for dairy products, traditional breeding methods can no longer meet the demand for dairy products. Intensive dairy cows Farms have gradually developed, but such small dairy farms are still operated as family or cooperative farms, and are still distributed in vast rural areas without a centralized scale. The organic wastewater generated by breeding cows and primary processing has not been effectively The processing has brought a great threat to the local environment.

Dairy farm wastewater refers to the general term for dairy cow urine, feces, feed residues, dripping milk, flushing water, and wastewater generated during workers' lives and production processes. It is a typical high-concentration organic wastewater that is harmful to the surrounding environment. . The water quality of dairy cow breeding wastewater is related to the structure of the barn, the way of cleaning manure, the use of flushing water, the nutrient content of the feed and production management. Components such as protein and fat generally have the following properties: (1) Wastewater contains some feces and urine, with high organic matter content, high suspended solids concentration, high ammonia nitrogen concentration, and darker chroma; (2) Wastewater contains a large amount of The B/C of wastewater is generally 0.35 to 0.6, and the biodegradability is good; (3) The solid residues in wastewater are mainly organic substances. If effective solid-liquid separation is not carried out, the subsequent treatment load will be increased. It is relatively difficult and affects the treatment effect; (4) the waste water contains toxic pollutants, such as heavy metals, residual veterinary drugs and a large number of pathogens, etc., and it will cause serious pollution to the ecological environment if it is discharged into the environment without treatment.

The treatment modes of dairy farming wastewater mainly include returning to the field for utilization, natural treatment and centralized treatment. With the development of society and economy, there will be less and less land used to absorb or treat feces-contaminated water. At the same time, the natural treatment mode has the risk of spreading diseases and will cause secondary pollution. Its utilization has great significance. Therefore, the centralized processing mode has received extensive attention and has gradually become the focus of research. Distributed dairy farm wastewater treatment requires flexibility, high efficiency, convenience, and intelligence. Most of them use anaerobic-aerobic-biological purification combined process. According to the nature of wastewater and the characteristics of various wastewater treatment processes, it is necessary to choose targeted At the same time, the design of wastewater treatment process should ensure the economical, effective and stable operation of wastewater treatment facilities.

Contents of the invention

Aiming at the technical problems existing in the prior art, the invention provides a modularized integrated process suitable for the treatment of dairy cow breeding wastewater.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A modular integrated process method suitable for the treatment of dairy farming wastewater. The wastewater is monitored by a monitoring module, and is controlled by a computer to enter a solid-liquid separation module, a first-level physicochemical module, a second-level biochemical module, and a third-level advanced treatment module for treatment. Including the following steps:

Step 1: Monitor the influent value through the monitoring module to judge the SS value. When the SS is less than 50mg/L, judge the sand content; when the SS is greater than 50mg/L, enter the centrifugal filter of the solid-liquid separation module for filtration. Judgment of sediment concentration in the effluent;

The second step: judge the sand content, when the sand content is less than 5%, enter the first-level physical and chemical module; when the sand content is greater than 5%, enter the air flotation cyclone separator of the solid-liquid separation module, and pass the air flotation The effluent separated by the flow separator enters the primary physical and chemical module;

The third step: the effluent is adjusted by the first-level physical and chemical module to combine and flocculate air flotation;

Step 4: Monitor the effluent value, if it meets the standard, proceed to the secondary physical and chemical module; if it does not meet the standard, repeat the first to fourth steps above;

Step 5: Monitor the influent value of the secondary biochemical module and judge the SCOD value. When the influent SCOD>1200mg/L, enter the high-efficiency anaerobic filter of the secondary physical and chemical module for reaction, otherwise carry out the complete secondary physical and chemical module Mixed anaerobic contact oxidation chamber reaction; when the effluent SCOD of the high-efficiency anaerobic filter of the secondary physical and chemical module is >8000mg/L, the backflow method is used to reduce the influent load of the anaerobic filter.

Step 6: When the secondary biochemical anaerobic sub-module effluent SCOD≯8000mg/L, it enters the semi-intermittent biological turntable, and then enters the activated carbon filter tank of the third-level advanced treatment module after passing through the semi-intermittent biological turntable, and then passes through the ultraviolet sterilizer Disinfect and monitor the disinfected water;

Step 7: Monitor the effluent value. When SS<10mg/L, TN<15mg/L or TP<0.5mg/L, meet the requirements and end the program; when the above requirements are not satisfied, run the aerobic of the secondary physical and chemical module The biochemical sub-module is then subjected to the activated carbon filter tank and ultraviolet disinfection of the three-level advanced treatment module.

Further, the solid-liquid separation module includes a side flow centrifugal filter and a cyclone separator to separate large particle suspensions or sediments in the wastewater.

Further, the length of the drum of the side flow centrifugal filter is 2.0 to 4.0 times the diameter, and the rotational speed and the diameter satisfy: n ² ·D·10 ^-6 = 2.3 to 3.0, where: n——rotating speed r/min; D - diameter m.

Further, the first-level physical and chemical module is an air flotation regulating tank, with built-in flocculation and air flotation agents. The dosage of flocculation and air flotation agents is selected according to the water temperature. When the temperature is lower than 12°C, ferric chloride and anionic polypropylene are added. Amide; when the temperature is not lower than 12°C, add PAC and HPAM (anionic polyacrylamide).

Further, the secondary biochemical module is provided with anaerobic sub-modules and aerobic sub-modules, wherein the anaerobic sub-modules include high-efficiency anaerobic filters and fully mixed anaerobic contact tanks arranged side by side, and the aerobic sub-modules include side-by-side Semi-batch biological turntable, batch membrane bioreactor.

Further, the batch-type membrane bioreactor operates in A/O mode, the time ratio of anoxic and aerobic is 1: (3-5), and the reaction time changes according to the influent concentration. When the influent COD concentration is less than 500mg/ L, the aerobic time is 8-12h; when the influent COD concentration is 500-2000mg/L, the aerobic time is 12-16h; when the influent COD concentration is greater than 2000mg/L, the aerobic time is greater than 16h, and the reactor is Water enters during the oxygen period and exits during the aerobic period.

Beneficial effects of the present invention:

1. The present invention is suitable for the treatment of small, fast and loose dairy farm wastewater with high concentration, complex components and large fluctuations.

2. The process combination of the present invention has a high degree of modularization, which is conducive to the transformation of technology into integrated equipment and saves space.

3. The process combination technology of the present invention is advanced, and can simultaneously process COD, nitrogen, and phosphorus, stably reach the standard, and the effluent can be recycled.

Description of drawings

Fig. 1 is a process roadmap of the present invention.

Fig. 2, Fig. 3 are the computer program block diagrams of the present invention.

1. Monitoring module; 2. Solid-liquid separation module; 3. Primary physical and chemical module; 4. Secondary biochemical module; 5. Advanced processing module; 6. Computer.

a. centrifugal filter; b. cyclone separator; c. air flotation tank; d. high-efficiency anaerobic filter; e. complete mixed contact oxidation reactor; f. Type membrane bioreactor); h. Active sand filter tank; i. Ultraviolet sterilizer.

-----------Process line; ---Signal input and output lines.

detailed description

The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments of the description.

Embodiment: The present invention is a modular integrated process suitable for the treatment of dairy cow breeding wastewater. The dairy cow breeding wastewater is monitored by the online water quality monitoring module 1, and is controlled by the computer 6 to enter the solid-liquid separation module 2, the first-level physicochemical module 3, and the second The first-level biochemical module 4 and the third-level advanced processing module 5 are processed, specifically including the following steps:

Step 1: Monitor the influent value through the monitoring module 1 to judge the SS value. When the SS is less than 50mg/L, judge the sand content; when the SS is greater than 50mg/L, enter the side flow centrifugal filter of the solid-liquid separation module 2 a Filtration, the filtered effluent is used to judge the sand content;

The second step: judge the sand content, when the sand content is less than 5%, enter the first-level physical and chemical module; when the sand content is greater than 5%, enter the air flotation cyclone separator b of the solid-liquid separation module The effluent separated by the floating cyclone flow separator b enters the primary physical and chemical module 3;

Step 3: The effluent passes through the air flotation regulating tank of the first-level physical and chemical module 3 to adjust homogenization and flocculation air flotation;

Step 4: Monitor the effluent value, if it meets the standard, proceed to the secondary physical and chemical module 4; if it does not meet the standard, repeat the first to fourth steps above;

Step 5: Monitor the influent value of the secondary biochemical module and judge the SCOD value. When the influent SCOD>1200mg/L, enter the high-efficiency anaerobic filter of the secondary physical and chemical module for reaction, otherwise carry out the complete secondary physical and chemical module Mixed anaerobic contact oxidation chamber reaction; when the effluent SCOD of the high-efficiency anaerobic filter of the secondary physical and chemical module is >8000mg/L, the backflow method is used to reduce the influent load of the anaerobic filter.

Step 6: When the secondary biochemical anaerobic sub-module effluent SCOD≯8000mg/L, it enters the semi-intermittent biological turntable, and then enters the activated carbon filter tank of the third-level advanced treatment module after passing through the semi-intermittent biological turntable, and then passes through the ultraviolet sterilizer Disinfect and monitor the disinfected water;

Step 7: Monitor the effluent value. When SS<10mg/L, TN<15mg/L or TP<0.5mg/L, meet the requirements and end the program; when the above requirements are not satisfied, run the aerobic of the secondary physical and chemical module The biochemical sub-module is then subjected to the activated carbon filter tank and ultraviolet disinfection of the three-level advanced treatment module.

The solid-liquid separation module 2 includes a side flow centrifugal filter a and a cyclone separator b, which mainly separates organic matter such as animal feces and some food residues in the aquaculture wastewater, and separates large particle suspensions or sediments from the wastewater to avoid Subsequent treatment equipment is clogged, which reduces the organic load of wastewater.

The length of the drum of the side flow centrifugal filter a is 2.0 to 4.0 times the diameter, and the rotational speed and diameter meet: n ² ·D·10 ^-6 = 2.3 to 3.0, where: n——rotating speed r/min; D—— diameter m.

The first-stage physicochemical module 3 is an air flotation regulating tank c, which has the functions of regulating homogenization and flocculation air flotation, and is integrated in the same reactor, and the regulating volume is 3 to 5 times of the average daily treated water volume. The air flotation adjustment tank has a built-in flocculation and air flotation agent, and the dosage of the flocculation air flotation agent is selected according to the water temperature. When the temperature is lower than 12°C, add ferric chloride and HPAM (anionic polyacrylamide); when the temperature is not lower than 12°C ℃, add PAC and HPAM (anionic polyacrylamide).

The secondary biochemical module is provided with an anaerobic sub-module and an aerobic sub-module connected in series, wherein the anaerobic sub-module includes a high-efficiency anaerobic filter and a complete mixed anaerobic contact tank arranged side by side, and the aerobic sub-module includes a side-by-side Semi-batch biological turntable, IMBR (Batch Membrane Bioreactor).

High-efficiency anaerobic filter (EAF) is an anaerobic bioreactor filled with microbial carriers (filter materials) inside. It uses a new type of polyester fiber ball filter material as a carrier, with a porosity of 85% and a specific surface area of 50,000 to 100,000m ² /g, part of the anaerobic microorganisms attach and grow on the filter material, forming an anaerobic biofilm, part of it grows in suspension in the gap of the filter material, the solid-liquid separation flows out and flows through the filter material with the biofilm, and the surface of the biofilm absorbs water The organic matter is degraded and transformed by microorganisms in the biofilm. It is mainly used in water with high concentration of dissolved organic matter. The maximum organic load is usually between 8 and 18kgCOD/(m ³ ·d). The purified water is discharged to Outside the pond, the generated biogas is collected and utilized.

The fully mixed anaerobic contact tank is equipped with different flow baffles in the reaction tank, and the sewage enters the reactor from the water distributor arranged at the bottom of each baffle interval. Good hydraulic conditions greatly increase the volume utilization rate of the reactor, have stable biological solid interception capacity and microbial population distribution conditions, are suitable for treating high-concentration organic wastewater, and have good and stable treatment effects.

The semi-intermittent biological turntable adopts two-stage biological turntables arranged in series, the first-stage turntable operates intermittently, and the organic load on the surface of the disc is 12-15gBOD ₅ /(m ² ·d); the second-stage biological turntable operates continuously.

The IMBR (intermittent membrane bioreactor) operates in A/O mode, the time ratio of anoxic and aerobic is 1: (3-5), and the reaction time changes according to the influent concentration. When the influent COD concentration is less than 500mg/ L, the aerobic time is 8-12h; when the influent COD concentration is 500-2000mg/L, the aerobic time is 12-16h; when the influent COD concentration is greater than 2000mg/L, the aerobic time is greater than 16h, and the reactor is Water enters during the oxygen period, and water exits during the aerobic period. This mode of operation does not require a sedimentation process.

The three-level advanced treatment module 4 includes an active sand filter tank h and an ultraviolet disinfection sub-module i, which are arranged in series.

An online monitoring module 1 is installed at the water inlet, through the collection and analysis of raw water quality information, the results are output to the computer 6, and the computer 6 sends signals to each module or sub-module unit to control the automatic operation of the overall process.

Claims (6)

1. one kind is suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment, it is characterized in that: waste water is through monitoring module monitors, enter solid-liquid separation module, one-level materialization module, secondary biochemical module and three grades of advanced treatment modules respectively by computer control to process, specifically comprise the steps:

The first step: be worth by monitoring module monitors water inlet, judges SS value, when SS is less than 50mg/L, judges sediment concentration; When SS is greater than 50mg/L, the centrifugal filter entering solid-liquid separation module filters, and the judgement of sediment concentration is carried out in the water outlet after filtration;

Second step: judge sediment concentration, when sediment concentration is less than 5%, enters one-level materialization module; When sediment concentration is greater than 5%, enter the air supporting cyclone separator of solid-liquid separation module, the water outlet be separated through air supporting cyclone separator enters one-level materialization module;

3rd step: water outlet regulates through one-level materialization module and all closes and flocculation-air floating;

4th step: monitor out water number, as up to standard, then carries out secondary materialization module; If not up to standard, then repeat above-mentioned first ~ four step;

5th step: monitoring enters the water inlet value of secondary biochemical module, judge SCOD value, as water inlet SCOD > 1200mg/L, enter in the efficient anaerobic filter tank of secondary materialization module and react, otherwise carry out the complete mixing anaerobic catalytic oxidation room reaction of secondary materialization module; As the efficient anaerobic filter tank water outlet SCOD > 8000mg/L of secondary materialization module, adopt reflux type, reduce the influent load of anaerobic filter.

6th step: as secondary biochemical anaerobism submodule water outlet SCOD ≯ 8000mg/L, enter semibatch blodisc, after semibatch blodisc, enter the activated carbon filter tank of three grades of advanced treatment modules, then carry out disinfection through ultraviolet ray sterilizer, the water after sterilization is monitored;

7th step: monitor out water number, as SS < 10mg/L, during TN < 15mg/L or TP < 0.5mg/L, meets the demands, and terminates program; When discontented above-mentioned requirements, run the aerobic biochemical submodule of secondary materialization module, then carry out activated carbon filter tank, the disinfection by ultraviolet light of three grades of advanced treatment modules.

2. be suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment as claimed in claim 1, it is characterized in that: described solid-liquid separation module comprises effluent centrifugal filter and cyclone separator, be separated macrobead suspended substance or throw out in waste water.

3. be suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment as claimed in claim 2, it is characterized in that: described effluent centrifugal filter rotary drum length is 2.0 ~ 4.0 times of diameter, rotating speed and diameter meet: n ²d10 ^-6=2.3 ~ 3.0, wherein: n---rotating speed r/min; D---diameter m.

4. be suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment as claimed in claim 1, it is characterized in that: described one-level materialization module is air supporting equalizing tank, built-in flocculation-air floating medicament, the injected volume of flocculation-air floating medicament: select according to water temperature, when temperature is lower than 12 DEG C, add iron trichloride and anionic polyacrylamide; When temperature is not less than 12 DEG C, add PAC and HPAM (anionic polyacrylamide).

5. be suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment as claimed in claim 1, it is characterized in that: described secondary biochemical module installation anaerobism submodule and aerobic submodule, wherein anaerobism submodule comprises the efficient anaerobic filter tank and complete mixing anaerobic contact tank that are set up in parallel, and aerobic submodule comprises the semibatch blodisc, the intermittent membrane bioreactor that are set up in parallel.

6. be suitable for the modularization integrated technology process of milk cattle cultivating wastewater treatment as claimed in claim 1, it is characterized in that: described intermittent membrane bioreactor, run in A/O mode, anoxic, aerobic time are than 1:(3 ~ 5), reaction times changes according to influent concentration, when inlet COD concentration is less than 500mg/L, aerobic time 8 ~ 12h; As inlet COD concentration 500 ~ 2000mg/L, aerobic time 12 ~ 16h; When inlet COD concentration is greater than 2000mg/L, aerobic time is greater than 16h, and reactor is intake, in the water outlet of aerobic time section in hypoxic exposure section.