Further Experimental Study On The Mechanism Of Denitrifying Phosphorus Removal Of Compound Flora

According to the present mechanism of phosphorus and nitrogen removal of sewage and its development trend, this paper, based on the status quo of denitrifying phosphorus and nitrogen removal mechanism and the foregoing production of our group, studies inoculation and enrichment of denitrifying phosphorus removal sludge. The paper aims at operation stability and reaction velocities of denitrifying phosphorus and nitrogen removal technics, posts operation stability of the technics from a fire-new angle which is transformation of PHB for the first time, quests for velocities of denitrifying phosphorus and nitrogen removal from the angle of intracellular and extracellular carbon source. At the same time, microorganism composition of the denitrifying phosphorus and nitrogen removal system has also been discussed. Main conclusions are as follows:(1) Active sludge is a compound microbe system which contains kinds of bacterium. If only proper surrounding is provided, the needed bacterium could be enriched. There are denitrifying phosphorus removal bacteria in conventional biological phosphorus removal system anaerobic/ oxic-SBR (A/O-SBR), and they are easy to be enriched in anaerobic/ anoxic/ oxic-SBR (A/AO-SBR). The domestication time of denitrifying phosphorus removal sludge inoculated from the conventional biological phosphorus removal system is shorter than that from the conventional biological nitrogen removal system. So it is suggested that sludge of denitrifying phosphorus removal technics should be inoculated from the conventional biological phosphorus removal system, then the domestication time will be shortened, it is in favor of fast startup of denitrifying phosphorus removal technics.(2) Saturation of PHB in microbe cell causes unstable run of anaerobic/ anoxic/ SBR(A/A-SBR). Along with the increasing of run time, because there is no the latter oxic phase oxidizing more PHB,inner drive of phosphorus release in anaerobic phase reduces gradually, finally PHB is saturated, the capacity of denitrifying phosphorus removal loses. PHB in microbe cell is further oxidized in A/AO-SBR because of the existence of the latter oxic phase. It ensures that there is a little of PHB at the start of anaerobic phase, then there is enough space to accumulate PHB over again, and the A/AO-SBR could run steadily.(3)when there is no extracellular carbon source, the velocities of denitrifying...