厌氧消化运转影响成分剖析(国外英文资料).doc

厌氧消化运行影响因素分析(国外英文资料) Analysis of the effects of anaerobic digestion Methane-producing reaction is anaerobic digestion process control stage, therefore, generally speaking, when discussing the influence factors of anaerobic biological treatment is mainly to discuss the various factors influencing the methanogens; The main factors are temperature, pH, REDOX potential, nutrient, organic load ratio (F/M ratio), toxic substances and so on. 1). Temperature factors: Especially the influence of temperature on the anaerobic microbes, anaerobic digestion of microorganisms are very sensitive to changes in temperature range (one day within 1.5 ~ 2 ℃ advisable), sudden changes in temperature has obvious effect on methane production, change above a certain temperature range, will stop the gas. Anaerobic bacteria can be classified as mesophilic (mesothermal), thermophilic bacteria (or high-temperature bacteria); Accordingly, anaerobic digestion is divided into: normal temperature digestion (10 ~ 30 ℃), medium temperature (33 ~ 35 ℃) and high temperature digestion (50 ~ 55 ℃); The reaction rate of high temperature digestion is about 1.5 to 1.9 times that of medium temperature, and the gas yield is relatively high, but the gas is low in methane. When treating wastewater or sludge containing pathogenic bacteria and parasitic eggs, high temperature digestion can achieve better health effects, and the dehydration of sludge is better after digestion. Along with the development research and application of new type of anaerobic reactor, and the influence of temperature on the anaerobic digestion is no longer very important (new reactor biomass is very big), so it can be under the condition of room temperature (20 ~ 25 ℃), in order to save energy and operation costs. PH and alkalinity: PH is the most important factor in anaerobic digestion, and pH changes directly affect digestion and digestion. Important reasons: methanogens is very sensitive to the change of pH value, it is generally be