生物难降解废水污泥的形成（Formation of biological refractory wastewater sludge）.docVIP

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生物难降解废水污泥的形成（Formation of biological refractory wastewater sludge）.doc

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生物难降解废水污泥的形成（Formation of biological refractory wastewater sludge）

生物难降解废水污泥的形成（Formation of biological refractory wastewater sludge） 1 main technical conditions for anaerobic granular sludge formation 1.1 wastewater properties In general, the treatment of sugar containing wastewater is easy to form granular sludge, while lipid wastewater and protein wastewater and toxic and refractory waste water are difficult to develop granular sludge or can not produce granular sludge. C:N:P of wastewater is required to be about 200:5:1, otherwise it should be properly supplemented. Adding appropriate amount of trace elements such as nickel, cobalt, molybdenum and zinc is beneficial to improve methane production of sludge, because these elements are important components of methane producing coenzyme [2]. 1.2 sludge load rate The most important operation control condition of sludge granulation process is the rate of sludge loading of degradable organic matter (COD). When the sludge loading rate reaches 0.3kgCOD/ (kgVSS.d), the granular sludge can begin to form. This provides plenty of food for the reproduction of microorganisms (carbon source), is the material basis of microbial growth. When the sludge loading rate of 0.6kgCOD/ (kgVSS.d), particle speed, so when the granular sludge appeared, will be quickly COD sludge loading rate increased to 0.6kgCOD/ (kgVSS.d) about the level, which is conducive to the granulation of [2]. 1.3 hydraulic load rate and gas production load rate Upflow is a necessary condition for the formation of granular sludge in a series of carrier free anaerobic reactors represented by UASB. The physical quantity that represents the upwelling condition is the rising velocity of water flow and the rising velocity of methane. They are the hydraulic load rate and the gas production load rate. The total of the action is usually called the system selection pressure (SelectionPressure). Pressure is selected to produce a mixing action and hydraulic screening effect on the sludge bed along the height (flow) direction. The shearing fo