CN110615584A - Device and method for standard treatment of bean product wastewater - Google Patents
Device and method for standard treatment of bean product wastewater Download PDFInfo
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Classifications
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- C02F2209/14—NH3-N
-
- 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
- C02F2209/18—PO4-P
-
- 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
- C02F2209/19—SO4-S
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a device and a method for standard treatment of bean product wastewater, which relate to the technical field of wastewater treatment and mainly comprise an adjusting primary sedimentation tank, an anaerobic tower, an anaerobic sedimentation tank, an aerobic tank, a secondary sedimentation tank, a reaction tank, a physicochemical sedimentation tank, a filter tank and a clean water tank which are sequentially connected through pipelines. The method for treating the bean product wastewater up to standard successfully solves the problem that high-concentration organic matters in the bean product wastewater are difficult to degrade, biochemical sludge generated in the operation of the system can be automatically digested in the system, the sludge treatment cost is reduced, and only a small amount of physicochemical sludge is discharged for disposal. The system has the characteristics of low investment cost, simple management, stable operation and the like.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a device and a method for standard treatment of bean product wastewater.
Background
The bean product is a product obtained by processing and manufacturing soybean serving as a main raw material. The bean product wastewater is mainly derived from bean soaking wastewater, squeezing wastewater and washing wastewater, and is characterized by large wastewater amount, high organic matter concentration and complex components.
The COD of the bean product production wastewater is up to 20000 to 30000mg/L, the COD of the bean soaking wastewater is 2000 to 3000mg/L, and the COD of the washing wastewater is 8000 to 10000mg/L, so that the water quality of the wastewater is different due to different production processes and product raw material reasons. The main components in the bean product wastewater comprise water-soluble non-protein nitrogen, fistulose threose, raffinose, citric acid, water-soluble vitamins, minerals, pigments and the like. The wastewater produced by a particular treatment process also contains proteins (soy albumin, soy lectin, trypsin inhibitor, etc.), amino acids, lipids, etc., as well as a large amount of okara and detergents, etc.
The standard treatment of the bean product wastewater is an important reason for troubles enterprises, and whether the wastewater can be stably treated and discharged after reaching the standard becomes a bottleneck for restricting the continuous and vigorous development of the enterprises. The water quality discharged after the traditional bean product wastewater treatment process is used for treating cannot reach the standard stably, and the environment is easily influenced. Moreover, the medicament input amount is large, the sludge amount is correspondingly increased, and the traditional process cannot reduce the burden of continuous development of enterprises more and more.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for standard treatment of bean product wastewater, which are used for performing biodegradation treatment on high-concentration organic matters in the bean product wastewater.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a bean product wastewater standard treatment device, which comprises a regulation primary sedimentation tank, an anaerobic tower, an anaerobic sedimentation tank, an aerobic tank, a secondary sedimentation tank, a reaction tank, a physicochemical sedimentation tank, a filter tank and a clean water tank which are arranged in sequence; the device also comprises a sludge tank, wherein the secondary sedimentation tank and the materialized sedimentation tank are communicated with the sludge tank.
Optionally, an aeration stirring device is arranged in the adjusting primary sedimentation tank.
Optionally, the anaerobic tower comprises an internal circulation system, the internal circulation system comprises a circulation pump, and the circulation pump is used for returning the wastewater before the effluent of the anaerobic tower to the water distributor of the anaerobic tower.
Optionally, an anaerobic lift pump is arranged between the anaerobic tower and the adjusting primary sedimentation tank.
Optionally, a liftable aerator is arranged in the aerobic tank.
Optionally, the secondary sedimentation tank is a radial sedimentation tank.
Optionally, the secondary sedimentation tank is provided with a sludge reflux pump, and the sludge reflux pump is used for refluxing the sludge in the secondary sedimentation tank to the aerobic tank and the anaerobic tower.
Optionally, a stirrer is arranged in the reaction tank.
The invention also provides a method of the bean product wastewater standard treatment device, which comprises the following steps:
s1: the bean product comprehensive wastewater automatically flows into a regulation primary sedimentation tank, aeration stirring and particle sedimentation are simultaneously carried out, particles are precipitated, the particles are discharged to a sludge tank through a sludge discharge pump, and the water quality and the water quantity are simultaneously adjusted;
s2: pumping the bean product wastewater regulated by the regulating primary sedimentation tank into an anaerobic tower;
s3: introducing part of effluent of the anaerobic tower into an adjusting primary sedimentation tank, and supplementing and adjusting alkalinity and buffering water quality of the primary sedimentation tank;
s4: introducing effluent of the anaerobic tower into an anaerobic sedimentation tank for sludge-water separation;
s5: introducing the wastewater precipitated by the anaerobic precipitation tank into an aerobic tank;
s6: introducing the effluent of the aerobic tank into a secondary sedimentation tank;
s7: introducing the effluent of the secondary sedimentation tank into a reaction tank, and adding a medicament for coagulation reaction;
s8: discharging the effluent treated by the reaction tank into a materialized sedimentation tank for mud-water separation, and settling the effluent;
s9: introducing the effluent of the physical and chemical sedimentation tank into a filtering tank to remove SS in the wastewater;
s10: the effluent of the filter tank flows to a clean water tank to be discharged after reaching the standard.
Optionally, in the step S7, the chemical agents added into the reaction tank are polyaluminium chloride and polyacrylamide, and the adding amount of the polyaluminium chloride is 0.5-0.6 kg/m3The dosage of polyacrylamide is 0.005-0.006 kg/m3。
Compared with the prior art, the invention has the following technical effects:
according to the device and the method for treating the bean product wastewater to reach the standard, aiming at the characteristic of high COD concentration of the bean product wastewater, the process wastewater firstly passes through a fine grid to remove floating substances and most of large-particle bean dregs and then enters an adjusting primary sedimentation tank, enters an anaerobic tower after pretreatment (keeping the pH of anaerobic inlet water between 6.5 and 7.0) such as adjusting aeration, sedimentation and the like, and then passes through the anaerobic tower, an aerobic tank and a reaction-physicochemical sedimentation tank to reach the standard and is discharged. The invention can reduce COD in the bean product wastewater from 12000-15000 mg/L to below 50mg/L, the removal rate of the COD is above 95%, the ammonia nitrogen in the wastewater is reduced from 30-50 mg/L to below 5mg/L, the removal rate of the ammonia nitrogen is above 90%, and the SS in the wastewater is reduced from 1000mg/L to below 10 mg/L. The bean product wastewater standard treatment method adopts a combined process of 'anaerobic tower-aerobic tank-reaction tank-physical and chemical sedimentation tank-filtration', and the process reduces part of investment and operation cost compared with the traditional bean product treatment process. And the whole process has small sludge production, effectively reduces the investment and the operating cost of sludge treatment, and has the advantages of low power consumption, low operating cost, simple operation and management, stable operation and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a bean product wastewater standard treatment device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment provides a device and a method for treating bean product wastewater to reach the standard, which are shown in figure 1. Aiming at the characteristic of high COD of bean product wastewater, the process wastewater enters an adjusting primary sedimentation tank, enters an anaerobic tower-aerobic tank-secondary sedimentation tank which is a core system of the invention to carry out biodegradation treatment on high-concentration organic matters after anaerobic effluent backflow and adjusting aeration stirring, and then is discharged by a reaction tank and a physicochemical sedimentation tank after reaching the standard.
The method for treating the bean product wastewater to reach the standard in the embodiment specifically comprises the following steps:
s1: the bean product wastewater automatically flows into the adjusting primary sedimentation tank after floaters and most of large-particle bean dregs are removed through the fine grating, an aeration stirring device is installed in the adjusting primary sedimentation tank, and the wastewater is homogenized, so that impact influence on subsequent biochemical steps caused by overhigh periodical organic matter concentration of the wastewater can be avoided. Adjusting the Chemical Oxygen Demand (COD) concentration of the water quality of the incoming water of the primary sedimentation tank to 12000-15000 mg/L and the Biochemical Oxygen Demand (BOD)5At 7000-10000 mg/L, ammonia nitrogen NH3The concentration of N is less than or equal to 50mg/L, the concentration of total phosphorus TP is less than or equal to 5mg/L, the concentration of suspended solid SS is less than or equal to 1000mg/L, and the pH range is 6-8.
S2: the process wastewater pretreated by the primary sedimentation tank is lifted by an anaerobic lift pump to enter an anaerobic tower, the anaerobic temperature is controlled to be 35-38 ℃, and the pH value is 7.0-7.2; controlling the hydraulic retention time HRT of the anaerobic tower to be 5d and the organic load to be 2.4-3.0 kgCOD/(m)3D), changing macromolecular pollutants in the wastewater into micromolecular pollutants, changing pollutants which are difficult to degrade into pollutants which are easy to degrade, greatly removing organic matters in the anaerobic tower to generate biogas, and recycling the biogas after purification.
S3: and introducing part of effluent of the anaerobic tower into the adjusting primary sedimentation tank, and supplementing and adjusting the alkalinity of the primary sedimentation tank and buffering the water quality.
S4: the process wastewater treated by the anaerobic tower automatically flows into an anaerobic sedimentation tank for mud-water separation, fine sludge flows back to the anaerobic tower, and clear water enters an aerobic tank. The anaerobic sedimentation tank intercepts anaerobic sludge, thereby preventing the anaerobic sludge from losing and avoiding the influence of the anaerobic sludge on a subsequent biochemical system. COD of effluent of anaerobic precipitation is 600-750 mg/L, and the removal rate is more than 95%.
The anaerobic tower is provided with an internal circulation system, namely, wastewater before water outlet in the anaerobic tower flows back to a water distributor of the anaerobic tower through a screw pump, so that the surface ascending flow velocity of the anaerobic tower during internal circulation and water inlet of the anaerobic tower is 1.0-1.5 m/h, and the ascending flow velocity is calculated as: (flow rate of the internal circulating water pump + flow rate of anaerobic intake water) is divided by the sectional area of the anaerobic tower. If the ascending flow velocity of the anaerobic tower is more than 1.8-2.0 m/h, the flocculent sludge in the anaerobic tower flows with a large amount of effluent, so that the sedimentation load of the anaerobic sedimentation tank is too large, and the anaerobic sedimentation tank cannot settle any time; if the ascending flow velocity of the anaerobic tower is less than 0.8m/h, the granular sludge and flocculent sludge of the anaerobic tower are precipitated, so that the mass transfer effect of the granular sludge of the anaerobic tower is reduced, and the COD (chemical oxygen demand) of the effluent of the anaerobic tower is increased.
The ascending flow velocity of the anaerobic sedimentation tank is between 0.8m/h and 1.0m/h, a centrifugal pump can be selected for the sludge return pump of the anaerobic sedimentation tank if the sludge of the anaerobic sedimentation tank is flocculent sludge, and a screw pump is selected for the sludge of the anaerobic sedimentation tank if the sludge of the anaerobic sedimentation tank is granular sludge, so that the anaerobic granular sludge is prevented from being broken by a water pump.
S5: and introducing the effluent of the anaerobic sedimentation tank into an aerobic tank, controlling 2-3mg/L of dissolved oxygen by aeration in the aerobic tank, providing survival conditions of various microbial floras, and efficiently removing organic matters. Controlling the hydraulic retention time HRT of the aerobic pool to be 2.5-3.0 d and the organic load to be 0.24-0.25 kgCOD/(m)3D). COD in the effluent of the aerobic tank is below 50mg/L, the removal rate reaches more than 91 percent, and the pH value is 7.5-8.
S6: the process wastewater treated by the aerobic tank automatically flows to a secondary sedimentation tank for sludge-water separation, the ascending flow velocity of the secondary sedimentation tank is 0.6-0.8 m/h, and a self-sucking pump, a centrifugal pump or a pipeline pump can be selected as a sludge reflux pump of the secondary sedimentation tank, and the self-sucking pump is preferred. The reflux ratio of more than 200 percent is easy to cause the reduction of the hydraulic retention time of the aerobic tank, the reflux pump is lower than 50 percent, and the sludge is easy to deposit in the secondary sedimentation tank, thereby causing the sludge to float upwards and turn black. The preferable backflow proportion of the sludge backflow pump of the secondary sedimentation tank is 80-160%. And (3) returning 90-95% of sludge in the secondary sedimentation tank to the aerobic tank for activated sludge supplement, and returning 5-10% of sludge in the secondary sedimentation tank to the anaerobic tower when the sludge amount is increased. The excess sludge is greatly reduced, and the produced excess sludge is discharged into a sludge concentration tank.
In the invention, after the sedimentation and the reflux treatment, 2-5% of the total amount of the obtained precipitated sludge is preferably used as residual sludge for subsequent filter pressing concentration treatment.
S7: and automatically flowing the effluent of the secondary sedimentation tank to a dosing reaction tank. A vertical stirrer is arranged in the reaction tank. Al in PAC flocculant2O3The dosage of the polyaluminium chloride with the content of 24 percent is 0.5-0.6 kg/m3. PAM is anion with the molecular weight of 1200 ten thousand, and the dosage is 0.005-0.006 kg/m3Suspended substances SS and chroma of effluent of a biochemical system are removed to achieve clarified effluent, so that the chroma of the treated sewage is less than 124 times;
s8: discharging the effluent treated by the reaction tank into a materialized sedimentation tank for mud-water separation, precipitating the effluent, discharging the generated materialized sludge into a sludge concentration tank, performing filter pressing by using a plate-and-frame filter press, wherein the water content is 70%, and the yield of the materialized sludge is about 0.2-0.3 ton of residual sludge generated by treating 1000 tons of wastewater;
s9: the effluent of the materialized sedimentation tank overflows to a filter tank, sludge in the materialized sedimentation tank is discharged into a sludge tank, and SS in the wastewater is removed through the filtering action of media such as fine sand, coarse sand, cobblestones and the like, so that the SS of the effluent is less than 10mg/L, the COD is less than 50mg/L, and NH is added3N is less than 5mg/L, and total phosphorus is less than 0.5 mg/L.
S10: and the effluent of the filter tank is discharged into a clean water tank, and the effluent meets the requirement of standard discharge.
The control of the sludge concentration of the anaerobic tower and the aerobic tank is vital to the realization of the wastewater with high COD, the sludge sedimentation ratio SV30 of the anaerobic tower is 30-40%, the sludge sedimentation ratio SV30 of the aerobic tank is 40-60%, and the ammonia nitrogen and the total phosphorus in the effluent of the physical and chemical sedimentation tank are respectively reduced to be below 5mg/L and below 0.5 mg/L.
Compared with the traditional anaerobic tower-aerobic tank process, the method for treating the bean product wastewater reaching the standard refines the proportion of the sludge in the secondary sedimentation tank flowing back to the anaerobic tower and the aerobic tank. The heterotrophic bacteria cultured in the anaerobic tower hydrolyze suspended pollutants such as starch, fiber, carbohydrate and the like and soluble organic matters in the sewage into organic acid, so that macromolecular organic matters are decomposed into micromolecular organic matters, insoluble organic matters are converted into soluble organic matters, and then the soluble organic matters enter the aerobic tank for aerobic treatment, so that the biodegradability of the sewage discharged by the anaerobic tower can be improved; under the condition that the aerobic tank has sufficient oxygen supply, most organic matters can be treated.
The method for treating the bean product wastewater to reach the standard can reduce COD of the bean product wastewater from 12000-15000 mg/L to below 50mg/L, the removal rate of the COD is above 99%, ammonia nitrogen in the wastewater is reduced from 20-50 mg/L to below 5mg/L, the removal rate of the ammonia nitrogen is above 80%, SS in the wastewater is reduced from 800-1000 mg/L to below 10mg/L, the removal rate of the SS is above 95%, total phosphorus in the wastewater is reduced from 50mg/L to below 0.5mg/L, and the removal rate of the SS is above 90%.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A bean product wastewater standard treatment device is characterized by comprising a regulation primary sedimentation tank, an anaerobic tower, an anaerobic sedimentation tank, an aerobic tank, a secondary sedimentation tank, a reaction tank, a physicochemical sedimentation tank, a filtering tank and a clean water tank which are sequentially arranged; the device also comprises a sludge tank, wherein the secondary sedimentation tank and the materialized sedimentation tank are communicated with the sludge tank.
2. The soybean wastewater treatment apparatus for meeting the standard according to claim 1, wherein an aeration stirring device is disposed in the primary settling tank.
3. The soybean wastewater treatment apparatus for reaching the standard according to claim 1, wherein the anaerobic tower comprises an internal circulation system, the internal circulation system comprises a circulation pump, and the circulation pump is used for returning the wastewater before the wastewater in the anaerobic tower flows out to the water distributor of the anaerobic tower.
4. The soybean wastewater treatment apparatus for meeting the standard according to claim 1, wherein an anaerobic lift pump is arranged between the anaerobic tower and the regulating primary sedimentation tank.
5. The soybean wastewater treatment apparatus according to claim 1, wherein a liftable aerator is disposed in the aerobic tank.
6. The soybean wastewater treatment apparatus according to claim 1, wherein the secondary sedimentation tank is a radial sedimentation tank.
7. The soybean wastewater treatment apparatus for meeting the standard according to claim 1, wherein the secondary sedimentation tank is provided with a sludge reflux pump for refluxing sludge in the secondary sedimentation tank to the aerobic tank and the anaerobic tower.
8. The soybean wastewater treatment apparatus according to claim 1, wherein a stirrer is disposed in the reaction tank.
9. A method for the bean product wastewater standard treatment device based on any one of claims 1-8, which is characterized by comprising the following steps:
s1: the bean product comprehensive wastewater automatically flows into a regulation primary sedimentation tank, and simultaneously aeration stirring and particle sedimentation are carried out, and the water quality and the water quantity are adjusted;
s2: pumping the bean product wastewater regulated by the regulating primary sedimentation tank into an anaerobic tower;
s3: introducing part of effluent of the anaerobic tower into an adjusting primary sedimentation tank, and supplementing and adjusting alkalinity and buffering water quality of the primary sedimentation tank;
s4: introducing effluent of the anaerobic tower into an anaerobic sedimentation tank for sludge-water separation;
s5: introducing the wastewater precipitated by the anaerobic precipitation tank into an aerobic tank;
s6: introducing the effluent of the aerobic tank into a secondary sedimentation tank;
s7: introducing the effluent of the secondary sedimentation tank into a reaction tank, and adding a medicament for coagulation reaction;
s8: discharging the effluent treated by the reaction tank into a materialized sedimentation tank for mud-water separation, and settling the effluent;
s9: introducing the effluent of the physical and chemical sedimentation tank into a filtering tank to remove SS in the wastewater;
s10: the effluent of the filter tank flows to a clean water tank to be discharged after reaching the standard.
10. The method of a bean product wastewater standard treatment device according to claim 9, wherein in the step S7, the added agents in the reaction tank are polyaluminium chloride and polyacrylamide, and the adding amount of the polyaluminium chloride is 0.5-0.6 kg/m3The dosage of polyacrylamide is 0.005-0.006 kg/m3。
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