| Industrial raw material for fermentation to produce ethanol with corn, corn broken pulping, is generally selected process route of serous fluid saccharification, mash fermentation, distillation extraction and ethanol, separation, drying, etc., in different stages of the fermentation wastewater pH, CODcr, quantity of emissions, index difference is very big.Corn fermentation wastewater pollutants of high concentration, high discharge temperature and discharge water, waste water and alcohol enterprise rich nutrients and biological sex good, conducive to biodegradable.Alcohol wastewater treatment more choose anaerobic, aerobic and advanced treatment processes, including high removal rate of anaerobic reaction, is the core of the biological treatment.Anaerobic reaction is the use of anaerobic degradation of organic matter, microbial metabolism process reaction process can be roughly divided into two aspects, acidic and alkaline digestion, the acid producing bacteria and acid decay fungi such as acid bacteria absorption of organic matter in wastewater, organic matter under the effect of microbial metabolic hydrolyzed into simple sugars, peptide, amino acids, such as hydrolysis stage end product including organic acids, alcohols, sulfur, hydrogen, ammonia, CO2 and energy, metabolism of organic acids including a, b, c, butyric acid, etc. [1].Acid bacteria strong adaptability, environmental changes, such as temperature, pH value have little impact on the active, acid bacteria is shorter life cycle at the same time, breeding a generation of [2] in only a few minutes to several hours.Alkaline digestion phase is mainly composed of methane bacteria using hydrolyzate metabolic, nutritional requirements for methane bacteria on the substrate is lower, the nutrition of common salt, CO2, alcohol, ammonia is methane bacteria can make use of nutrients, methane bacteria belong to obligate anaerobic bacteria, each of the methane bacteria metabolize only specific substrates, such as formic acid methane bacteria can only use carbon dioxide, hydrogen, formate synthesis of methane by metabolic pathways, low oxygen methane bacteria can only be pentanoic acid decomposition of acetic acid and propionic acid, greatly influenced by environmental factors on the methane bacteria, rapid changes in temperature, pH will significantly reduce the activity of bacteria, methane bacteria breeding generation takes 4 to 6 days, generation time relatively acid bacteria grow a lot of [3].Corn to produce ethanol fermentation process route is longer, the nature difference is very big, in different stages of the fermentation wastewater corn crushing stage of pulping wastewater, which consists mainly of starch, such as soaking liquid phase liquid saccharification wastewater are sugar, starch, distillation waste water are mainly ethanol, CIP cleaning liquid ingredients multifarious, anaerobic system different water quality of wastewater treatment, anaerobic effluent pH changed, CODcr, volatile acid and other indicators.Anaerobic system to deal with different water quality, and its water index differences, mainly in CODcr, volatile acid, etc., through comparing with normal anaerobic effluent index, analysis of water quality on the anaerobic system.Corn fermentation industry, industrial water use, wastewater emissions at the same time, supporting the construction of the sewage system capacity is slightly greater than the total amount of wastewater, sewage treatment system shall be maintained in the process of production running smoothly, to avoid abnormal fluctuations. |
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