Advanced treatment process and system for cassava-based ethanol wastewater
A technology of advanced treatment and ethanol, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problem of high treatment cost, difficult solid-liquid separation, and difficult treatment and other problems, to achieve the effect of reducing total nitrogen discharge, treating water quality well, and improving treatment effect
Inactive Publication Date: 2014-07-23
上海天之冠可再生能源有限公司
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Problems solved by technology
Potato starchy fuel ethanol mainly includes root starchy raw materials such as cassava and sweet potato. Because of its good processing performance, it has been used as an ideal substitute raw material for large-scale fuel ethanol production. In the production process of potato non-grain starchy fuel ethanol A large amount of acidic, high-temperature and high-concentration organic wastewater is produced, and 11-15 tons of process wastewater can be produced for every 1 ton of fuel ethanol produced. Large, high content of suspended solids and difficult solid-liquid separation, difficult to handle, high processing cost
After this kind of wastewater passes through the fully mixed anaerobic reactor to produce biogas, the tail water still has a high COD concentration and a high viscosity
UASB, IC and other anaerobic reactors are usually used for secondary anaerobic reactors. Currently, circular reactors with a height-to-diameter-depth ratio are used, and the height of the reactor can reach 10-30 meters. Wastewater lifting requires large energy consumption.
Frequent cleaning shortens the effective operating time of the facility and reduces the life of the membrane, which affects the normal operation of the treatment facility and significantly increases the operating cost
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[0039] A cassava ethanol production wastewater, the total treated water volume is 5000m3 / d, the pollutant concentration in the influent is: COD=48000mg / L, SS=30000mg / L, after anaerobic treatment, it reaches COD=2500mg / L, SS=1000mg / L index of. After anoxic fluidized bed, MBR and nanofiltration advanced treatment. Among them, the MBR controls the residence time of 30h, the reflux ratio is 500%, and the pH of the effluent is controlled at 9.5 to enter the nanofiltration. The water quality after treatment is shown in the table below:
[0040]
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The invention discloses an advanced treatment process for cassava-based ethanol wastewater. Wastewater generated after cassava-based ethanol is subjected to multistage anaerobic digestion to generate methane is sequentially treated in an anaerobic fluidized bed, a membrane bioreactor, an intermediate tank and a nanofiltration device until nanofiltration water is discharged up to the standard. The invention also discloses a treatment system comprises the anaerobic fluidized bed, the membrane bioreactor, the intermediate tank and the nanofiltration device which are connected in sequence.
Description
technical field [0001] The invention relates to the technical field of environmental protection, in particular to an advanced treatment process of cassava ethanol wastewater and a special treatment system. Background technique [0002] Fuel ethanol has the characteristics of cleanness and regeneration, which can reduce the emission of carbon monoxide and hydrocarbons in automobile exhaust. It is an important part of renewable energy. important role in increasing income. At present, the national strategic plan for the development of fuel ethanol requires "not to compete with others for food, not to compete with food for land", actively and scientifically develop non-grain fuel ethanol, insist on focusing on non-food, encourage the diversification of raw materials, and become the development trend of fuel ethanol technology. Potato starchy fuel ethanol mainly includes root starchy raw materials such as cassava and sweet potato. Because of its good processing performance, it h...
Claims
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Login to View More IPC IPC(8): C02F9/14C02F1/44
Inventor 杨蕴毅王宏杰吴凯秦岭盛爱红王超林吴孔伟
Owner 上海天之冠可再生能源有限公司
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