Anaerobic-aerobic stabilization process for high concentration organic wastewater
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A stabilized treatment and organic wastewater technology, applied in the direction of aerobic and anaerobic process treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of low volume load, large aeration, energy high volumetric load, shortened process, and reduced energy consumption
Active Publication Date: 2014-03-26
CEEP CO LTD
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[0004] Purpose of the present invention: to provide a high-concentration organic wastewater anaerobic-aerobic stabilization treatment process to solve the shortcomings of the existing high-concentration organic wastewater treatment process, such as low volume load, large aeration rate, and high energy consumption. Sludge bulking, the problem of realizing sludge reduction
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Embodiment 1
[0030] The wastewater flow rate of a petrochemical enterprise is 10000m 3 / d, COD concentration 1000-1500mg / L, ammonia nitrogen concentration 90-140mg / L, sulfide concentration 40-12mg / L, petroleum concentration 600-50mg / L. The process of the invention mainly makes the petrochemical waste water pass through the anaerobic-aerobic reactor and then settle and discharge directly.
[0031] 1. The sewage first passes through the pretreatment degreaser to remove most of the heavy oil, slick oil and remaining emulsified oil;
[0032] 2. The sewage treated by the pretreatment degreaser is treated by the iron-carbon micro-electrolysis process and then enters the UASB anaerobic reactor; Anaerobic Granular Sludge
[0033] 3. Sewage enters the UASB anaerobic reactor for anaerobic digestion, quickly starts the UASB reactor, the reaction temperature is 35-38°C, the rising flow rate is 0.6-0.8m / h, the reflux ratio is 100%-200%, and the volume load is 8- 12kgCOD / (m 3 d);
[0034] 4. The ef...
Embodiment 2
[0038] A food company has a waste water volume of 15000m 3 / h, COD concentration 300-1000mg / L, SS concentration 200-400mg / L, BOD concentration 200-600mg / L, petroleum 600-50mg / L, first filter for degreasing treatment;
[0039] 2. After the sewage is treated by the iron-carbon micro-electrolysis process, it enters the UASB anaerobic reactor;
[0040] 3. The sewage enters the UASB anaerobic reactor for anaerobic digestion, the reaction temperature is 35-38°C, the upflow velocity is 0.8-1.2m / h, the reflux ratio is 150%-200%, and the volume load is 10kgCOD / (m 3 d);
[0041]4. The effluent from the UASB anaerobic reactor passes through the intermediate sedimentation tank for primary sedimentation, and part of it flows back to the UASB as an internal circulation, and the effluent from the sedimentation tank enters the SBAR aerobic reactor;
[0042] 5. The SBAR aerobic reactor has a cycle of 3 hours, a drainage ratio of 60-80%, and settling for 20 minutes. The volume of aerobic gran...
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Abstract
The invention provides an anaerobic-aerobic stabilization process for high concentration organic wastewater. The process is as below: (1) wastewater is subjected to pretreatment and iron carbon micro electrolysis according to the quality and sent into a UASB anaerobic reactor for anaerobic digestion reaction; (2) UASB effluent is sent into a facultative sedimentation basin, which has the functions of an anaerobic tank; (3) liquid supernatant from the facultative sedimentation basin is sent into an SBAR aerobic reactor, wherein the sludge in the reactor is domesticated mature aerobic granular sludge, and air is introduced from the bottom of the aerobic reactor for air aeration treatment; (4) the sewage is subjected to sedimentation treatment in the aerobic reactor, and after sedimentation treatment the water flows out from a water outlet; (5) a reflux system can be set in the SBAR aerobic reactor according to quality of the outlet water, and part of the sludge in the SBAR aerobic reactor can be returned to the UASB anaerobic reactor; and (6) a reflux system can be set in the SBAR aerobic reactor according to quality of outlet mixed liquid, and part of the mixed liquid can be returned to the facultative sedimentation basin. Especially, wastewater indexes are as below: UASB inlet water preferably has COD at 1500-5000 mg / L, suspended solids less than 1500 mg / L, sulfate less than 1000 mg / L and ammonia nitrogen less than 2000 mg / L, and SBAR inlet water has COD concentration reaching 1000-1500 mg / L, ammonia nitrogen concentration less than 1500 mg / L and BOD / COD greater than 0.3.
Description
technical field [0001] The invention relates to an anaerobic-aerobic stabilization treatment process for high-concentration organic wastewater, and belongs to the technical field of environmental protection water pollution prevention and control. Background technique [0002] Petrochemical, food, brewing, breeding, slaughtering, catering and other industries will produce a large amount of high-concentration organic wastewater. The COD of wastewater is generally above 1000mg / L, and some even reach tens of thousands or even hundreds of thousands. The BOD / COD value Greater than 0.3; the organic matter in wastewater is mostly aromatic compounds and heterocyclic compounds with complex components, and also contains sulfides, nitrides, heavy metals and toxic organic compounds; the wastewater has high chroma, odor, and strong acidity and alkalinity. High-concentration organic wastewater will make the receiving water body hypoxic or even anaerobic, leading to the death of most aquati...
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