CN111348805A - Anaerobic treatment process for organic wastewater - Google Patents
Anaerobic treatment process for organic wastewater Download PDFInfo
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- CN111348805A CN111348805A CN202010216663.2A CN202010216663A CN111348805A CN 111348805 A CN111348805 A CN 111348805A CN 202010216663 A CN202010216663 A CN 202010216663A CN 111348805 A CN111348805 A CN 111348805A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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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
- C02F1/00—Treatment of water, waste water, or sewage
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
An anaerobic treatment process of organic wastewater, which comprises the steps of pretreating the organic wastewater by a pretreatment system, and then feeding the organic wastewater into an anaerobic fermentation tank for stirring and anaerobic fermentation; then storing the biogas generated in the anaerobic fermentation tank into a biogas storage tank, wherein one part of the biogas in the biogas storage tank is dehydrated and desulfurized by a dehydration and desulfurization device and then recovered, and the other part of the biogas enters a concentration separator for aeration; then the effluent of the anaerobic fermentation tank enters a concentration separator, is aerated by methane to carry out anaerobic biological contact treatment, meanwhile, anaerobic sludge in the concentration separator flows back to the anaerobic fermentation tank for repeated fermentation, and the sludge at the bottom of the anaerobic fermentation tank is discharged for treatment at regular intervals; and finally, the aerated methane escapes from the air outlet of the concentration separator and is recycled into the methane storage tank, and the effluent water separated by the concentration separator is sterilized by a sterilizing tank and then is recycled. The invention solves the problems that most of anaerobic processes have large influence on water inlet by SS, the internal structure is complex, and some processes need to add fillers with higher price.
Description
Technical Field
The invention relates to the field of sewage purification, in particular to an anaerobic treatment process for organic wastewater.
Background
In industrial organic wastewater such as domestic sewage, food processing and paper making, organic substances such as carbohydrates, proteins, oils and fats, lignin and the like are contained. These substances are present in the sewage in a suspended or dissolved state and can be decomposed by biochemical action of microorganisms. Oxygen is consumed in its decomposition process and is therefore referred to as an oxygen-consuming contaminant. Such contaminants can cause a reduction in dissolved oxygen in the water, affecting the growth of fish and other aquatic organisms. After the dissolved oxygen in water is exhausted, the organic matter is anaerobically decomposed to generate unpleasant odors such as hydrogen sulfide, ammonia and mercaptan, which deteriorate the water quality and also adversely affect the surrounding environment.
The organic waste water treatment needs a sludge anaerobic process, and under the anaerobic condition, the organic matters in the sewage are decomposed, metabolized and digested by anaerobic bacteria, so that the organic matters in the sewage are greatly reduced, and the sewage treatment mode of methane is generated. Currently, the commonly used anaerobic processes in the market include an internal circulation anaerobic reactor (IC), an upflow anaerobic sludge bed reactor (UASB), an upflow solid reactor (USB), an Anaerobic Filter (AF), an anaerobic fluidized bed reactor (UBF), an expanded granular sludge bed reactor (EGSB), a fully mixed reactor (CSTR), and the like. An anaerobic sludge bed reactor (UASB) needs to be provided with a three-phase separator and an effective water distributor, so that the fed water is uniformly distributed at the bottom of a digester, the SS content of the fed water is required to be low, solids and microorganisms are easy to run off when the hydraulic load and the SS load are high, and the operation technical requirement is high; the Upflow Solid Reactor (USR) has relatively strict structural limitation and smaller monomer volume; the digester of the full mixing reactor (CSTR) has larger volume, is difficult to completely mix, has enough stirring and higher energy digestion, and the substrate is not completely digested when flowing out of the system, so the microorganism is lost along with the discharge; the Anaerobic Filter (AF) is not suitable for feeding with high SS, the filler cost is high, blockage and short circuit are easy to occur, the feed liquid feeding resistance is increased by the accumulation of microorganisms, and a long start-up period is needed; the anaerobic fluidized bed reactor (UBF) requires high energy consumption and maintenance costs for fluidizing sludge, damages pumps or other equipment when the granular media are flushed out, and requires a degassing device to effectively separate the media particles from the suspended solids if necessary; the internal circulation anaerobic reactor (IC) is not suitable for materials with more suspended matters; the expanded granular sludge bed reactor (EGSB) is not suitable for treating sewage with high SS content because of high upflow speed operation and high requirements on operation conditions and control technology. As can be seen from the processes, most of the prior anaerobic processes have the problems that the inlet water is greatly influenced by SS, the internal structure is complex, and the filling with a high price needs to be added in some processes. Therefore, it is important to invent a high-efficiency anaerobic treatment process for organic wastewater.
Disclosure of Invention
The invention aims to provide an anaerobic treatment process method of organic wastewater, which solves the problems that most of anaerobic processes have large influence on inlet water due to SS (suspended substance), the internal structure is complex, and some processes need to add fillers with higher price.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an anaerobic treatment process of organic wastewater comprises the following steps:
firstly, organic wastewater is pretreated by a pretreatment system and then enters an anaerobic fermentation tank for stirring and anaerobic fermentation;
then storing the biogas generated in the anaerobic fermentation tank into a biogas storage tank, wherein one part of the biogas in the biogas storage tank is dehydrated and desulfurized by a dehydration and desulfurization device and then recovered, and the other part of the biogas enters a concentration separator for aeration;
then the effluent of the anaerobic fermentation tank enters a concentration separator, is aerated by methane to carry out anaerobic biological contact treatment, meanwhile, anaerobic sludge in the concentration separator flows back to the anaerobic fermentation tank for repeated fermentation, and the sludge at the bottom of the anaerobic fermentation tank is discharged for treatment at regular intervals;
and finally, the aerated methane escapes from the air outlet of the concentration separator and is recycled into the methane storage tank, and the effluent water separated by the concentration separator is sterilized by a sterilizing tank and then is recycled.
Preferably, in order to balance the proliferation of methanogens and the speed of discharging, the retention time of the sludge in the anaerobic fermentation tank in the step is 10-15 days, the ambient temperature is 30-45 ℃, and the concentration load is 3-4 kgCOD/(m3 d).
Preferably, in order to increase the sludge concentration in the anaerobic fermentation tank and increase the digestion rate, the sludge in the sludge thickener is refluxed to the anaerobic fermentation tank at a reflux ratio of 100-400% in the third step.
Further, the device structure for realizing the anaerobic treatment process of the organic wastewater comprises a pretreatment system, an anaerobic fermentation tank, a concentration separator, a biogas storage tank, a dehydration and desulfurization device and a disinfection tank, wherein an outlet of the pretreatment system is connected to the anaerobic fermentation tank by a pump, one gas outlet of the anaerobic fermentation tank is connected to the biogas storage tank, and the other outlet of the anaerobic fermentation tank is connected to the concentration separator by a pump; one outlet of the methane storage tank is connected to the concentration separator, and the other outlet is connected to the dehydration and desulfurization device; the first outlet of the concentration separator is connected to the anaerobic fermentation tank by a pump, the second outlet is connected to the biogas storage tank, and the third outlet is connected to the disinfection tank.
Preferably, the concentration separator is a device which is improved on the basis of membrane bioreactor integrated equipment and is suitable for anaerobic environment, the concentration separator comprises an anaerobic reaction tank, a sludge pump, a water production device and a back washing device, and an aeration device and a membrane component are arranged in the anaerobic reaction tank.
Preferably, in order to filter fine particles in sewage more effectively, the membrane module uses a ceramic microfiltration membrane having a filtration membrane pore size of 0.1 μm and a membrane flux of 35 LMH.
By utilizing the process provided by the invention, a three-phase separation device, an anaerobic sedimentation tank and a complex water distribution system are not required to be arranged; the influence of SS on the system is small, and the requirement of water inlet on no toxic substances, pH 6-8, large suspended substances and the like in water quality can be met; anaerobic sludge is not easy to run off, the sludge concentration is high, and the organic matter concentration removal efficiency is high; strong impact load resistance and stable water outlet effect. Wherein, the anaerobic fermentation tank and the concentration separator are both in a sealed state, which can ensure the normal activity of anaerobic microorganism and avoid the leakage of methane to cause unnecessary potential safety hazard. The invention not only solves the problem of wastewater treatment, but also recovers the methane resource.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic view of an anaerobic treatment process of organic wastewater according to the present invention.
Detailed Description
The anaerobic treatment process of organic wastewater shown in fig. 1 specifically comprises the following steps:
according to the water quality condition of organic wastewater generated from food processing, paper mills, farms and the like, the organic wastewater is discharged into a pretreatment system for pretreatment, and the pretreatment system can carry out pretreatment by adopting a physical and chemical method such as a grating machine, a solid-liquid separator or a pH adjusting tank, so as to achieve the purpose of removing most large-particle suspended matters or neutralizing the water quality. After being treated by the pretreatment system, the sewage is pumped into an anaerobic fermentation tank. In order to keep the value-added speed of methanogens balanced with the speed of discharged material, the retention time of sludge in the anaerobic fermentation tank is 10-15 days, the environmental temperature is 30-45 ℃, and the concentration load reaches 3-4 kgCOD/(m)3D) removing pollutants such as COD, SS and the like by anaerobic fermentation. The anaerobic fermentation tank can adopt an anaerobic process with a simple structure in a hydraulic or mechanical stirring mode.
And then storing the biogas generated in the anaerobic fermentation tank into a biogas storage tank, dehydrating a part of biogas in the biogas storage tank by a dehydration and desulfurization device by a cold separation method, a solvent absorption method or a solid physical absorption method, desulfurizing by a wet method or a dry method, recovering, and aerating the other part of biogas in a concentration separator.
And pumping the effluent of the anaerobic fermentation tank into a concentration separator, aerating by biogas, and carrying out anaerobic biological contact treatment. The aeration of the methane can keep the physicochemical shape, the microbial population and the like in the concentration separator consistent, so that organic matters are effectively contacted with the microbes, and the mass transfer effect is obviously improved. Meanwhile, anaerobic sludge in the concentration separator is returned to the anaerobic fermentation tank by a pump for repeated fermentation. In order to increase the sludge concentration in the anaerobic fermentation tank and improve the digestion rate, the sludge is concentratedAnd refluxing the sludge in the compressor to the anaerobic fermentation tank at a reflux ratio of 100-400%. And (3) periodically discharging the sludge at the bottom of the anaerobic fermentation tank. In order to thoroughly ferment the anaerobic sludge, the sludge in the anaerobic fermentation tank stays for 10 to 15 days, the ambient temperature is 30 to 45 ℃, and the concentration load reaches 3 to 4kgCOD/(m3 d). The concentration separator is a device which is improved on the basis of MBR (membrane bioreactor) integrated equipment and is suitable for anaerobic environment, an aerobic pool is removed, an aeration device and a membrane component are arranged in an anaerobic reaction pool, and the concentration separator also comprises a sludge pump, a water production device, a back washing device and the like. The aeration device at the bottom of the anaerobic reaction tank uses methane aeration to fully mix water, and simultaneously, the membrane component realizes sludge-water separation, so that the detention period of microorganisms greatly exceeds the water conservation detention time, and the concentration load is improved to 10 COD/(m)3D) above. In order to filter the tiny particles in the sewage more effectively, the filtering membrane of the membrane component adopts a ceramic micro-filtering membrane with the aperture of 0.1 mu m, the membrane flux reaches 35LMH, and the service life is as long as more than 5 years.
And finally, the aerated methane escapes from the air outlet of the concentration separator and is recycled into the methane storage tank, and the effluent water separated by the concentration separator is sterilized by a sterilizing tank and then is recycled.
The process for anaerobic treatment of organic wastewater according to the present invention is described above with reference to the accompanying drawings, and it is to be understood that the invention is not limited thereto, and that various modifications can be made without departing from the scope of the invention, provided that the process concept and technical solution of the present invention are used.
Claims (6)
1. An anaerobic treatment process of organic wastewater is characterized by comprising the following steps:
(a) after being pretreated by a pretreatment system, the organic wastewater enters an anaerobic fermentation tank to be stirred and subjected to anaerobic fermentation;
(b) storing biogas generated in the anaerobic fermentation tank into a biogas storage tank, wherein one part of biogas in the biogas storage tank is dehydrated and desulfurized by a dehydration and desulfurization device and then recovered, and the other part of biogas enters a concentration separator for aeration;
(c) the effluent of the anaerobic fermentation tank enters a concentration separator, is aerated by methane to carry out anaerobic biological contact treatment, meanwhile, anaerobic sludge in the concentration separator flows back to the anaerobic fermentation tank for repeated fermentation, and the sludge at the bottom of the anaerobic fermentation tank is discharged for treatment at regular intervals;
(d) the aerated methane escapes from the air outlet of the concentration separator and is recycled to the methane storage tank, and the effluent water separated by the concentration separator is recycled after being disinfected by the disinfection tank.
2. The process of claim 1, wherein the sludge in the anaerobic fermentor is maintained for 10-15 days at an ambient temperature of 30-45 ℃ under a concentration load of 3-4 kgCOD/(m3 d).
3. The anaerobic treatment process for organic wastewater according to claim 1, wherein the sludge in the sludge thickener is refluxed to the anaerobic fermentor at a reflux ratio of 100 to 400% in the step (c).
4. The anaerobic treatment process of organic wastewater as claimed in claim 1, wherein the device for realizing the anaerobic treatment process of organic wastewater comprises a pretreatment system, an anaerobic fermentation tank, a concentration separator, a biogas storage tank, a dehydration desulfurization device and a disinfection tank, wherein an outlet of the pretreatment system is connected to the anaerobic fermentation tank by a pump, an outlet of the anaerobic fermentation tank is connected to the biogas storage tank, and the other outlet is connected to the concentration separator by a pump; one outlet of the methane storage tank is connected to the concentration separator, and the other outlet is connected to the dehydration and desulfurization device; the first outlet of the concentration separator is connected to the anaerobic fermentation tank by a pump, the second outlet is connected to the biogas storage tank, and the third outlet is connected to the disinfection tank.
5. The anaerobic treatment process of organic wastewater as claimed in claim 4, wherein the concentration separator is a device adapted to anaerobic environment improved on the basis of membrane bioreactor integrated equipment, and comprises an anaerobic reaction tank, a sludge pump, a water production device and a back washing device, and an aeration device and a membrane module are arranged in the anaerobic reaction tank.
6. The anaerobic treatment process for organic wastewater according to claim 5, wherein the membrane module uses a ceramic microfiltration membrane with a filtration membrane pore size of 0.1 μm and a membrane flux of 35 LMH.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010216663.2A CN111348805A (en) | 2020-03-25 | 2020-03-25 | Anaerobic treatment process for organic wastewater |
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| CN202010216663.2A CN111348805A (en) | 2020-03-25 | 2020-03-25 | Anaerobic treatment process for organic wastewater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526792A (en) * | 2021-07-26 | 2021-10-22 | 江苏中车环保设备有限公司 | Method and system for resourceful treatment of kitchen waste water |
| CN114368838A (en) * | 2022-01-11 | 2022-04-19 | 苏州科特环保股份有限公司 | Treatment method of nitrogen and phosphorus wastewater |
| CN115417556A (en) * | 2022-08-12 | 2022-12-02 | 上海东振环保工程技术有限公司 | Anaerobic bioreactor |
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| US20070251881A1 (en) * | 2003-02-21 | 2007-11-01 | Kurita Water Industries Ltd. | Method for treating water containing ammonium-nitrogen |
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| CN102153251A (en) * | 2011-05-11 | 2011-08-17 | 上海膜达克环保工程有限公司 | External anaerobic membrane bioreactor and waste water purification technology thereof |
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| CN106673190A (en) * | 2016-12-22 | 2017-05-17 | 常州大学 | Waste water efficient anaerobic treatment process and device |
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2020
- 2020-03-25 CN CN202010216663.2A patent/CN111348805A/en active Pending
Patent Citations (6)
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| US20070251881A1 (en) * | 2003-02-21 | 2007-11-01 | Kurita Water Industries Ltd. | Method for treating water containing ammonium-nitrogen |
| JP2005131478A (en) * | 2003-10-29 | 2005-05-26 | Mitsubishi Heavy Ind Ltd | Apparatus and method for treating nitrogen-containing organic waste |
| CN101333050A (en) * | 2007-09-12 | 2008-12-31 | 北京中科国益环保工程有限公司 | Waste water treating process of salt-containing propenoic acid and/or salt-containing propylene ester |
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| CN106673190A (en) * | 2016-12-22 | 2017-05-17 | 常州大学 | Waste water efficient anaerobic treatment process and device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526792A (en) * | 2021-07-26 | 2021-10-22 | 江苏中车环保设备有限公司 | Method and system for resourceful treatment of kitchen waste water |
| CN113526792B (en) * | 2021-07-26 | 2023-04-07 | 江苏中车华腾环保科技有限公司 | Method and system for resourceful treatment of kitchen waste water |
| CN114368838A (en) * | 2022-01-11 | 2022-04-19 | 苏州科特环保股份有限公司 | Treatment method of nitrogen and phosphorus wastewater |
| CN115417556A (en) * | 2022-08-12 | 2022-12-02 | 上海东振环保工程技术有限公司 | Anaerobic bioreactor |
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