CN106977042B - Modularized integration method suitable for soy sauce brewing wastewater treatment - Google Patents

Modularized integration method suitable for soy sauce brewing wastewater treatment Download PDF

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CN106977042B
CN106977042B CN201610985305.1A CN201610985305A CN106977042B CN 106977042 B CN106977042 B CN 106977042B CN 201610985305 A CN201610985305 A CN 201610985305A CN 106977042 B CN106977042 B CN 106977042B
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soy sauce
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CN106977042A (en
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于鹏飞
何亚婷
李希
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Chongqing Helijia Network Technology Co.,Ltd.
Zhuhai Po Men Food Co ltd
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Shenyang Jianzhu University
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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
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/007—Modular design
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes

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  • Environmental & Geological Engineering (AREA)
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Abstract

The invention relates to the field of high-concentration organic wastewater integrated treatment, in particular to a modular integration method suitable for soy sauce brewing wastewater treatment. Aiming at the problem of treating high-concentration organic wastewater generated in the production process of soy sauce brewing enterprises, the process integration and parametric design are carried out, a primary pretreatment module, a secondary biochemical module and a three-level advanced treatment module are adopted, the primary pretreatment module is used for removing suspended matters and adjusting the uniform function, and the secondary biochemical module is provided with an anaerobic submodule (an anaerobic expansion bed/an anaerobic fluidized bed) and an aerobic submodule (a semi-batch biological rotating disc and a batch membrane bioreactor) which are connected in series; the three-stage advanced treatment module is provided with a mixed flocculation sedimentation tank, an activated carbon adsorption tank and an ultraviolet disinfection submodule which are connected in series, and the operation parameters of the operation module and the control module are selected according to the water quality condition of the inlet water. The invention has the characteristics of flexibility, high efficiency, convenience, intelligence and the like, and can ensure the economic, effective and stable operation of the wastewater treatment facility.

Description

Modularized integration method suitable for soy sauce brewing wastewater treatment
Technical Field
The invention relates to a high-concentration organic wastewater integrated treatment technology, in particular to a modular integrated method suitable for treating soy sauce brewing wastewater.
Background
At present, the production of soy sauce in China mainly comprises a low-salt solid state process in the north and a high-salt dilute state process in the south. The general soy sauce production process includes the procedures of raw material treatment, starter propagation, fermentation, oil leaching and oil spraying, heating preparation and the like, the soy sauce wastewater is food fermentation wastewater with high organic matter content, the components of the soy sauce wastewater mainly comprise grain residues (such as broken bean scraps, bran, flour, sugar, soy sauce, fermentation residues, enzymes and metabolites secreted by various microorganisms and microorganisms, soy sauce pigments, trace detergents, disinfectants, a small amount of salt and the like), the chromaticity is high, the components are complex, and therefore the wastewater treatment has certain difficulty.
The difficulties of soy sauce wastewater treatment are as follows:
(1) the chroma is high. The soy sauce pigment is the most difficult part to remove from the soy sauce wastewater, and mainly comprises two parts: firstly, the black color is formed due to the sugar ammonia reaction (Maillard reaction) in the soy sauce fermentation process; secondly, because of the caramel pigment which is manually added when the product is prepared. Both of these substances are highly complex high molecular compounds, and the molecular structures thereof have not been clarified so far. The chromogen group contained in the water-soluble organic compound consists of two or more than two conjugated chromogens which enable organic molecules to generate an absorption peak in a visible light region, so that the wastewater has chromaticity. Experience shows that the removal of the chromaticity of the wastewater by methods such as an activated carbon adsorption tank, micro-electrolysis and the like is not ideal, and the chromaticity tends to be deepened in the process of oxygenation and stripping. The removal of pigment substances in the wastewater is a difficult point in the treatment of the soy sauce wastewater, and the prior report that the pigment substances reach the first-class discharge standard is rare.
(2) High salinity: the salt is one of main raw materials for producing soy sauce, and the soy sauce tank rinsing water, the filter cloth rinsing water and the like in the soy sauce wastewater are high-salt sewage with the salt content of 1-5% (about 10000-50000 mg/L). Although the salt content can be reduced after the production wastewater is uniformly mixed with other common sewage of a soy sauce seasoning factory, the salt content is still at a higher level. The salinity has little influence on the physicochemical treatment process, but has corrosion effect on contacted metal equipment, and the service life of the equipment is shortened. In addition, high salinity has a large impact on the biochemical treatment process.
(3) The impact load changes greatly. The seasonal change of the water quality of the soy sauce wastewater is another difficulty in the wastewater treatment process, most of soy sauce factories have relatively concentrated koji making seasons, and particularly, soy sauce factories adopting the exposure process are particularly suitable for the treatment of soy sauce. The yeast making waste water has different properties from other waste water, and during yeast making, soaking waste water with extremely high concentration is generated, so that the COD of the soaking waste water is up to about 20000mg/L, and great difficulty is caused in treating the soy sauce waste water. The factory is in a production mode of fixed production, so that the fluctuation of the quality of the wastewater is great, the change of impact load is also great, and meanwhile, the normal operation of a biological treatment facility is greatly influenced.
(4) The contaminant composition is unstable. Some soy sauce production enterprises have complex product types, and generally comprise fermented products such as light soy sauce, dark soy sauce, red vinegar, chili sauce, mashed garlic sauce, vinegar, oil consumption, fermented bean curd and the like, so that the components of the waste water are more complex, and the treatment is more difficult.
(5) The biochemical treatment process has high sludge yield. The soy sauce wastewater belongs to high-concentration organic wastewater, and the common soy sauce wastewater treatment process still takes a biological treatment method represented by an activated sludge method as a main method at present. The large excess sludge produced during biological treatment often contains considerable amounts of unstable organic matter, which is a problem in biological treatment. The sludge is generally composed of loose substances and is characterized in that: the water content is high, and the volume of the sludge can reach dozens of times of the volume of the contained solid; the zoogloea formed by various microorganisms and adsorbed organic matters and inorganic matters thereof comprise: contains N, P, K, several trace elements, organic matter, pathogenic microbe, parasitic ovum, heavy metal, organic matter, etc. Because the sludge is large in size, unstable in property and extremely easy to decay, the sludge is not beneficial to transportation and disposal, and the direct or potential threat to the environment can be caused. At present, the treatment and disposal of excess sludge have the problems of effectiveness and economy. Firstly, there is no effective method which can be generalized and has no pollution to the environment; second, various sludge treatment and disposal methods require a significant amount of capital. In addition, with the increasing of soy sauce output, the treatment capacity and treatment rate of soy sauce wastewater are improved, the sludge production is also increased rapidly, and whether the sludge produced by the soy sauce wastewater treatment can be effectively treated and disposed is also the key of the soy sauce wastewater treatment technology. With the development of urban economy and the increase of population in China, the environmental pollution is increasingly serious, the enhancement of environmental consciousness and the improvement of the requirement on environmental quality of people inevitably cause more soy sauce industries with high concentration and high chroma to need treatment, and the specially generated sludge is also a problem which needs to be considered.
Disclosure of Invention
The invention aims to provide a modular integration method suitable for treating brewing soy waste water, which aims at solving the problem of treating high-concentration organic waste water generated in the production process of brewing soy enterprises and realizes process modularization, intellectualization and integration by carrying out process integration and parametric design.
The technical scheme of the invention is as follows:
a modular integration method suitable for soy sauce brewing wastewater treatment adopts a primary pretreatment module, a secondary biochemical module and a tertiary advanced treatment module, and the process route is as follows: water inlet → on-line water quality monitoring system → first-stage pretreatment module → second-stage biochemical module → third-stage advanced treatment module → water outlet, the specific process is as follows:
an online water quality monitoring system is arranged at a water inlet end, the result is output to an automatic control system through collecting and analyzing the water quality information of the incoming raw water, and the automatic control system sends signals to each module or sub-module unit so as to control the automatic operation of the whole process; the treated soy sauce brewing wastewater is discharged through the three-stage advanced treatment module, the water quality information of the water outlet end is output to the automatic control system, and the operation parameters of the operation module and the control module are selected according to the water quality condition of the inlet water.
According to the modular integration method suitable for soy sauce brewing wastewater treatment, sewage enters a primary pretreatment module, and has functions of removing suspended matters and adjusting, the primary pretreatment module comprises three units which are respectively a fine grid, a self-cleaning filter and a hydrolysis acidification tank, the fine grid, the self-cleaning filter and the hydrolysis acidification tank are sequentially connected in series, and the fine grid is communicated with the hydrolysis acidification tank through a bypass; wherein the fine grid is in continuous operation, and the gap width of the grid bars is 3-5 mm; the filtering precision of the self-cleaning filter adopts 5-20 meshes, the operation is carried out intermittently according to the water outlet condition of the fine grid, and the operation is carried out automatically when the suspended matter SS is more than 100 mg/L; and (4) continuously operating the hydrolysis acidification tank, wherein the hydraulic retention time HRT is 4.0-6.0 h.
According to the modular integration method suitable for soy sauce brewing wastewater treatment, the secondary biochemical module comprises an anaerobic submodule and an aerobic submodule which are connected in series for operation; the anaerobic submodule comprises an anaerobic expansion bed and an anaerobic fluidized bed which are arranged in parallel, and the aerobic submodule comprises a semi-batch type biological rotating disc and a batch type membrane bioreactor which are sequentially arranged in series.
The modularized integrated method suitable for treating the brewing soy waste water is characterized in that when the chemical oxygen demand SCOD is dissolved in the inflow water from the hydrolytic acidification tank<104When the concentration is mg/L, the anaerobic submodule operates an anaerobic expansion bed; when the solubility chemical oxygen demand SCOD of the inlet water from the hydrolysis acidification tank is more than or equal to 104At mg/L, the anaerobic submodule operates the anaerobic fluidized bed(ii) a The anaerobic expanded bed and the anaerobic fluidized bed share the same equipment body, and the conversion process is automatically controlled by changing the operation parameters of the equipment.
The modularized integrated method suitable for treating the soy sauce brewing wastewater continuously operates the semi-batch type biological rotating disk, and when the secondary biochemical effluent requires that the suspended substance SS is less than 10mg/L, the total nitrogen TN is less than 15mg/L or the total phosphorus TP is less than 0.5mg/L, the batch type membrane bioreactor is operated.
The modular integration method suitable for soy sauce brewing wastewater treatment comprises the step that the three-stage advanced treatment module comprises a mixed flocculation sedimentation tank, a fiber turntable filter tank, an active carbon adsorption tank and an ultraviolet disinfection tank which are sequentially connected in series on a pipeline.
According to the modular integration method suitable for soy sauce brewing wastewater treatment, a mixing flocculation sedimentation tank is formed by connecting a mixing tank, a flocculation tank and a sedimentation tank to share the same equipment body, the mixing tank adopts a mechanical mixing tank, a coagulant adopts polyaluminium chloride, and the mixing time of the mixing tank is 60 s; a mechanical flocculation tank is adopted as the flocculation tank, and the reaction time is 12-15 min; the sedimentation tank adopts an inclined plate sedimentation tank or an inclined tube sedimentation tank, and the ascending flow velocity of the clear water area adopts 1.2-1.5 mm/s.
The modularized integration method suitable for soy sauce brewing wastewater treatment adopts a fiber rotary disc filter tank with the filtering speed of 8-12 m3/h.m2The filter unit of the fiber rotary disc filter tank operates continuously, and the color of the outlet water is measured>Operating the activated carbon adsorption tank when the temperature is 30 ℃; the ultraviolet ray sterilizing tank is continuously operated.
The design idea of the invention is as follows:
aiming at the problem of treating high-concentration organic wastewater generated in the production process of soy sauce brewing enterprises, process integration and parametric design are carried out. According to the characteristics of the production wastewater and the requirements of the wastewater treatment process, such as: the technology is mature and reliable, the operation is stable, the maintenance and management are convenient, the technology is economical and applicable, and the like, and the soy sauce brewing wastewater treatment process is selected.
Since the soy sauce brewing wastewater contains high-concentration organic pollutants which are easy to degrade and has good biodegradability, the soy sauce brewing wastewater is suitable for being treated by a biological method. Because the single anaerobic process and the single aerobic process can not realize the high-efficiency removal of the high-concentration organic matters in the production wastewater, the combined operation of the anaerobic process and the aerobic process is necessary.
The invention relates to a soy sauce brewing wastewater integration technical method, which comprises three modules: the device comprises a primary pretreatment module, a secondary biochemical module and a tertiary advanced treatment module.
The primary pretreatment module is mainly provided with functions of removing suspended matters and hydrolyzing and acidifying. The fine grating is arranged to remove larger suspended matters in the water so as to ensure that the subsequent treatment facilities can normally run; a self-cleaning filter is arranged to remove smaller suspended matters; the hydrolysis acidification tank is arranged, so that the organic matter concentration of the wastewater is reduced, the B/C ratio is improved, the volume load of a subsequent biochemical treatment system is greatly improved, and the removal efficiency is improved.
The secondary biochemical module is mainly provided with an anaerobic submodule and an aerobic submodule, wherein the anaerobic submodule is an anaerobic expanded bed/anaerobic fluidized bed, and the aerobic submodule comprises a semi-batch type biological rotating disk and a batch type membrane bioreactor (operating in an A/O two-stage mode).
The anaerobic expanded bed/anaerobic fluidized bed is an anaerobic bioreactor filled with microbial carrier (filler), adopts novel polyester fiber filter material as carrier, and has specific surface area of 900m2/m3Anaerobic microorganisms partially adhere to and grow on the filter material to form an anaerobic biological membrane, partially suspend and grow in gaps of the filter material, solid-liquid separation effluent flows through the filter material hung with the biological membrane, organic matters in water are adsorbed on the surface of the biological membrane, and the anaerobic biological membrane is degraded and converted by microorganisms in the biological membrane and is mainly applied to water with high concentration of soluble organic matters, wherein the maximum organic load is usually 10-40 kgCOD/(m & ltm & gt/m & lt/m & gt3D), discharging the purified water out of the pool through a drainage device, and collecting and utilizing the generated methane.
Compared with other anaerobic bioreactors, the anaerobic expanded bed and fluidized bed reactors have the following main process characteristics:
(1) the fine particle filler is used as a carrier, so that a large specific surface area is provided for the attachment and growth of anaerobic microorganisms, and the concentration of the anaerobic microorganisms in the reactor can reach a high level, generally reaching 30gVSS/L and above;
(2) has very high organic volume load, which can reach 10-40 kgCOD/(m)3D), so that the hydraulic retention time required is shorter when treating similar waste waters;
(3) the device has better impact load resistance and stable operation;
(4) the filler in the reactor is always in an expansion or fluidization state, so that the phenomenon of filler blockage can not occur;
(5) the retention time of the biological solid in the reactor is longer, and the output of the residual sludge is less;
(6) the method can be applied to the treatment of high-concentration organic wastewater and can also be applied to the treatment of low-concentration urban wastewater.
The difference between the anaerobic expanded bed and the anaerobic fluidized bed reactor is as follows:
(1) the hydraulic ascending flow velocity in the reactor is different;
(2) the expansion rate of biofilm particle carriers is different.
Compared with an anaerobic expanded bed reactor, in the anaerobic fluidized bed reactor, the ascending flow rate of the adopted water flow is higher, and the fluidization of filler particles in the reactor is stronger, so that the contact between the wastewater in the reactor and an anaerobic biological membrane on the filler is closer, the mass transfer efficiency is better, the removal of pollutants in the wastewater can be enhanced, and the treatment effect of the anaerobic fluidized bed reactor is higher.
The semi-batch type biological rotating disk adopts two stages of biological rotating disks which are arranged in series, the first stage of biological rotating disk operates intermittently, and the organic load on the surface of the disk is 12-15 g BOD5/(m2D)); the secondary biological rotating disc continuously runs. The semi-batch type biological rotating disc can effectively improve the nitrogen and phosphorus removal efficiency, and has the characteristics of small floor area, small sludge production, good treatment effect and the like.
The intermittent membrane bioreactor operates in an A/O mode, and the ratio of anoxic time to aerobic time is 1: (3-5) and the aerobic time is 8-12 h. The reactor is supplied with water in an anoxic time period and is discharged in an aerobic time period. The process can obviously improve the effluent treatment effect, particularly the removal of total nitrogen, can ensure that the effluent reaches the first-grade A standard, and the operation of the method does not need a precipitation process and has less sludge production.
The anaerobic submodule and the aerobic submodule are arranged in series.
The three-stage advanced treatment module is mainly provided with a mixed flocculation sedimentation tank (formed by connecting three units of a mixing tank, a flocculation tank and a sedimentation tank to share the same equipment body), a fiber rotary disc filter tank, an activated carbon adsorption tank and an ultraviolet disinfection submodule.
The mixing flocculation tank (mixing tank and flocculation tank) adopts a mechanical mixing flocculation mode, and the coagulant adopts polyaluminium chloride. The main advantages of mechanical stirring and rapid mixing flocculation are that the mixing effect is good, the revolution of the stirrer can be adjusted along with the change of water quantity after the speed regulating motor is configured, the influence of the change of water quantity is avoided, the mechanical stirring and rapid mixing flocculation device is suitable for water plants of various scales, and the head loss is small. The sedimentation tank adopts an inclined plate sedimentation tank, so that the sedimentation efficiency is high and the occupied area is small.
The filtering speed of the fiber rotary disc filter tank is 8-12 m3/h.m2The fiber rotary disc filter tank is characterized in that after being filtered by a fiber filter cloth rotary disc (sewage is filtered from the outside of filter cloth to the inside of a filter disc), filtered water is collected by a central cylinder, and each step of the filtering process is controlled by an automatic control system (a micro-processing unit). Therefore, the automatic control system can adjust the time and frequency of the back washing operation and the tank bottom sludge treatment operation, and can ensure the flexible operation of the system; meanwhile, a user can monitor the filtering system in real time and remotely operate the filtering system through the control system. The device has the advantages of simple equipment, small occupied area, low capital construction investment, small quantity of backwashing water, low energy consumption, simple management and preferential adoption under the condition of limited occupied area.
The activated carbon adsorption tank is a water treatment method for removing pollutants in water by utilizing the physical adsorption, chemical adsorption, oxidation, catalytic oxidation, reduction and other properties of activated carbon, and is one of the main methods for removing chromaticity at present.
Ultraviolet disinfection is carried out by irradiating water with ultraviolet light, and is a photochemical process.
The advantages are that: the method has the advantages of high sterilization efficiency, short action time, small danger, no secondary pollution, short disinfection time, no need of constructing a larger contact tank, greatly reduced floor area and civil engineering cost, and no influence on the biological population of the tail water receiving water body.
The mixed flocculation sedimentation tank continuously operates, when the chroma of the effluent is more than 30, the activated carbon adsorption tank is operated, and the ultraviolet disinfection tank continuously operates.
In actual operation, an online water quality monitoring system is arranged at the water inlet end, the result is output to the automatic control system through collecting and analyzing the water quality information of the incoming raw water, and the automatic control system sends signals to each module or sub-module unit so as to control the automatic operation of the whole process.
The invention is suitable for a modularized integration method for treating soy sauce brewing wastewater, and has the following technical characteristics:
1. the invention is suitable for treating the waste water of the soy sauce brewing field with high concentration, complex components and large fluctuation;
2. the anaerobic process adopts the anaerobic expanded bed/the anaerobic fluidized bed, the two processes share one body device, and the conversion process is automatically controlled by changing the operation parameters of the device, so that the floor area is saved and the manufacturing cost is saved;
3. the aerobic process adopts a process with less or even no sludge production, reduces the generation of high-concentration industrial sludge, reduces the sludge treatment cost and reduces pollution;
4. the process combination has high modularization degree, is beneficial to the technology to be converted into integrated equipment, and saves space;
5. the process combination technology is advanced, COD, nitrogen and phosphorus can be simultaneously treated, the stability reaches the standard, and the effluent can be recycled.
Drawings
FIG. 1 is a process scheme of the present invention. In the figure, 1, an online water quality monitoring system; 2. a primary pre-processing module; 3. a secondary biochemical module; 4. a third-level advanced processing module; 5. an automatic control system. a. Fine grids; b. a self-cleaning filter; c. a hydrolysis acidification pool; d. an anaerobic expanded bed; e. an anaerobic fluidized bed; f. a semi-batch rotating biological disk; g. a batch membrane bioreactor; h. a mixed flocculation sedimentation tank; i. a fiber rotary disc filter chamber; j. an activated carbon adsorption tank; k. an ultraviolet ray disinfection tank.
FIG. 2 is a block diagram of the computer automatic control system of the present invention.
Detailed Description
As shown in fig. 1-2, in the specific implementation process, the process route of the modular integrated method for treating waste water from brewing soy sauce of the present invention is water inlet → on-line water quality monitoring system 1 → primary pretreatment module 2 → secondary biochemical module 3 → tertiary advanced treatment module 4 → water outlet, and the specific process is as follows:
an on-line water quality monitoring system 1 is arranged at a water inlet end, the result is output to an automatic control system 5 through collecting and analyzing the water quality information of the incoming raw water, and the automatic control system 5 sends signals to all modules (a primary pretreatment module 2, a secondary biochemical module 3 and a tertiary advanced treatment module 4) or sub-module units so as to control the automatic operation of the whole process. The treated soy sauce brewing wastewater is discharged through the three-stage advanced treatment module 4, the water quality information of the water outlet end is output to the automatic control system 5, and the operation parameters of the operation module and the control module are selected according to the water quality condition of the inlet water.
The sewage firstly enters a primary pretreatment module 2, the primary pretreatment module 2 comprises three units, namely a fine grid a, a self-cleaning filter b and a hydrolysis acidification tank c, the fine grid a, the self-cleaning filter b and the hydrolysis acidification tank c are sequentially connected in series, and the fine grid a is communicated with the hydrolysis acidification tank c through a bypass. Wherein the fine grid a runs continuously, and the gap width of the grid bars is 3-5 mm; the filtering precision of the self-cleaning filter b is 5-20 meshes, and the self-cleaning filter b intermittently operates according to the water outlet condition of the fine grid a, namely automatically operates when the suspended solids SS are more than 100 mg/L; and (4) continuously operating the hydrolysis acidification tank c, wherein the hydraulic retention time HRT is 4.0-6.0 h.
The secondary biochemical module 3 comprises an anaerobic submodule and an aerobic submodule which are connected in series for operation.
The anaerobic submodule comprises an anaerobic expanded bed d and an anaerobic fluidized bed e, and the anaerobic expanded bed d and the anaerobic fluidized bed e are arranged in parallel. When the influent water from the hydrolysis acidification tank c dissolves chemical oxygen demand (SCOD)<104At mg/L, it is tiredThe oxygen sub-module operates an anaerobic expansion bed d; when the influent water Solubility Chemical Oxygen Demand (SCOD) from the hydrolysis acidification tank c is more than or equal to 104When mg/L, the anaerobic submodule operates an anaerobic fluidized bed e; the anaerobic expanded bed d and the anaerobic fluidized bed e share the same equipment body, and the conversion process is automatically controlled by changing the operation parameters of the equipment.
The aerobic submodule comprises a semi-batch type biological rotating disk f and a batch type membrane bioreactor g (MBR) which are sequentially and serially arranged, the semi-batch type biological rotating disk f continuously operates, and the batch type membrane bioreactor g operates when the secondary biochemical effluent requires suspended substance SS to be less than 10mg/L, total nitrogen TN to be less than 15mg/L or total phosphorus TP to be less than 0.5 mg/L.
And the third-level advanced treatment module 4 comprises a mixed flocculation sedimentation tank h (formed by connecting three units of a mixing tank, a flocculation tank and a sedimentation tank to share the same equipment body), a fiber rotary disc filter i, an activated carbon adsorption tank j and an ultraviolet disinfection tank k which are sequentially arranged in series. The mixing tank adopts a mechanical mixing tank, the coagulant adopts polyaluminium chloride, and the mixing time of the mixing tank is 60 s; a mechanical flocculation tank is adopted as the flocculation tank, and the reaction time is 12-15 min; the sedimentation tank adopts an inclined plate sedimentation tank (or an inclined tube sedimentation tank), and the rising flow velocity of the clear water area is 1.2-1.5 mm/s; the filtering speed of the fiber rotary disc filter i is 8-12 m3/h.m2. The filter unit of the fiber rotary disc filter i is in continuous operation, and the color of the outlet water is measured>And 30, operating the activated carbon adsorption tank j, and continuously operating the ultraviolet disinfection tank k.
The result shows that the modularized integrated method for treating the soy sauce brewing wastewater has the following technical characteristics:
1. is suitable for treating the waste water of the small, quick and scattered soy sauce brewing field with high concentration, complex components and large fluctuation;
2. the anaerobic process adopts an anaerobic expanded bed/an anaerobic fluidized bed, the two processes share one body device, and the conversion process is automatically controlled by changing the operation parameters of the device, so that the floor area is saved and the manufacturing cost is saved;
3. the aerobic process adopts a process with less sludge production amount and even no sludge production, thereby reducing the generation of high-concentration industrial sludge, lowering the sludge treatment cost and reducing pollution;
4. the process combination has high modularization degree, is beneficial to the technology to be converted into integrated equipment, and saves space;
5. the process combination technology is advanced, COD, nitrogen and phosphorus can be treated simultaneously, the stability reaches the standard, and the effluent can be recycled.

Claims (4)

1. A modular integration method suitable for soy sauce brewing wastewater treatment is characterized in that a primary pretreatment module, a secondary biochemical module and a three-level advanced treatment module are adopted in the integration method, and the process route is as follows: water inlet → on-line water quality monitoring system → first-stage pretreatment module → second-stage biochemical module → third-stage advanced treatment module → water outlet, the specific process is as follows:
selecting operation parameters of an operation module and a control module according to the water quality condition of inlet water, arranging an online water quality monitoring system at a water inlet end, collecting and analyzing the water quality information of the incoming raw water, outputting the result to an automatic control system, and sending a signal to each module or sub-module unit by the automatic control system so as to control the automatic operation of the whole process; the treated soy sauce brewing wastewater is discharged through the three-stage advanced treatment module, and the water quality information of the water outlet end is output to the automatic control system;
the sewage enters a primary pretreatment module, which has the functions of removing suspended matters and adjusting, the primary pretreatment module comprises three units, namely a fine grid, a self-cleaning filter and a hydrolysis acidification tank, the fine grid, the self-cleaning filter and the hydrolysis acidification tank are connected in series in sequence, and the fine grid is communicated with the hydrolysis acidification tank through a bypass; wherein the fine grid is in continuous operation, and the gap width of the grid bars is 3-5 mm; the filtering precision of the self-cleaning filter adopts 5-20 meshes, the operation is carried out intermittently according to the water outlet condition of the fine grid, and the operation is carried out automatically when the suspended matter SS is more than 100 mg/L; the hydrolysis acidification pool is continuously operated, and the hydraulic retention time HRT = 4.0-6.0 h;
the secondary biochemical module comprises an anaerobic submodule and an aerobic submodule which are arranged in series for operation; the anaerobic submodule comprises an anaerobic expansion bed and an anaerobic fluidized bed which are arranged in parallel, and the aerobic submodule comprises a semi-batch biological rotating disc and a batch membrane bioreactor which are sequentially arranged in series;
when the influent water from the hydrolysis acidification tank dissolves the chemical oxygen demand SCOD<104When the concentration is mg/L, the anaerobic submodule operates an anaerobic expansion bed; when the solubility chemical oxygen demand SCOD of the inlet water from the hydrolysis acidification tank is more than or equal to 104When the concentration is mg/L, the anaerobic submodule operates an anaerobic fluidized bed; the anaerobic expanded bed and the anaerobic fluidized bed share the same equipment body, and the conversion process is automatically controlled by changing the operation parameters of the equipment;
and continuously operating the semi-batch type biological rotating disk, and operating the batch type membrane bioreactor when the secondary biochemical effluent requires that the suspended substance SS is less than 10mg/L, the total nitrogen TN is less than 15mg/L or the total phosphorus TP is less than 0.5 mg/L.
2. The modular integrated process for brewing soy waste treatment according to claim 1, characterized in that: the three-stage advanced treatment module comprises a mixed flocculation sedimentation tank, a fiber rotary disc filter tank, an activated carbon adsorption tank and an ultraviolet disinfection tank which are sequentially connected in series on a pipeline.
3. The modular integrated process for brewing soy waste treatment according to claim 2, characterized in that: the mixing flocculation sedimentation tank is formed by connecting a mixing tank, a flocculation tank and a sedimentation tank to share the same equipment body, the mixing tank adopts a mechanical mixing tank, a coagulant adopts polyaluminium chloride, and the mixing time of the mixing tank is 60 s; a mechanical flocculation tank is adopted as the flocculation tank, and the reaction time is 12-15 min; the sedimentation tank adopts an inclined plate sedimentation tank or an inclined tube sedimentation tank, and the ascending flow velocity of the clear water area adopts 1.2-1.5 mm/s.
4. The modular integrated process for brewing soy waste treatment according to claim 2, characterized in that: the filtering speed of the fiber rotary disc filter tank is 8-12 m3/h.m2The filter unit of the fiber rotary disc filter tank operates continuously, and the color of the outlet water is measured>Operating the activated carbon adsorption tank when the temperature is 30 ℃; the ultraviolet ray sterilizing tank is continuously operated.
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