The Study Of Temperature Characteristics On The Phosphorus Accumulating Bacteria

There are many ways to remove phosphorus in water, in which the mosteconomical way is biological phosphorus removal and widely used all over the world.Biological phosphorus removal mainly use the properties of Phosphorus accumulatingbacteria s anaerobic phosphorus release and excess aerobic phosphorus s absorption toreduce phosphorus in water, and finally to achieve the purpose of removing phosphorusthrough mud disposal. The temperature has an effect on microbe, Microbe activity isbest when it is in proper temperature, many researches and practical engineerings havefound that biological phosphorus removal is affected by temperature and is easy tocause phosphorus removal fluctuate, However, there exists difference betweentemperature s effect on phosphorus removal and common microbial temperature seffect. The experiment studies the properties of biological phosphorus removal;analyzes the changing ways of phosphorus-accumulating bacteria and phosphorus, andalso analyzes the influence on phosphorus removal mechanism from enzyme activity indifferent temperatures.Results:(1) Starting the biological phosphorus removal system when the temperatureis200C,we find that SBR through A/o operating can gather the phosphorus-accumulatingbacteria, which will cost19s. The Lower temperature, the longer time to start reactorand the longer sludge age. After the stability of the system operation, removal rate canreach85%when the temperature of phosphate is100C,95%in150C,75%in300C.Temperature-rising within a certain range has benefit on the growth ofphosphorus-accumulating bacteria and will improve it s activity and it s removalefficiency; much higher or lower temperature (above250C, below150C) can reduce theoperating efficiency of the system, which is not conducive to the growth of phosphorus accumulating bacteria and will reduce the efficiency of phosphorus removal(2) Biological phosphorus removal is greatly affected by sludge age, especially inlower temperature. It is obvious that the effect of phosphorus removal reduces when thesludge age from30d to7d in150C. phosphorus-accumulating bacteria has strongeractivity in temperature-changing for a long time than in a short time, which suggeststhat adequate SRT can strengthen the system activity.(3) Temperature has a great influence on reaction kinetics of phosphorus sludge. In25OC,aerobic reaction activity is in a maximum state, anaerobic reaction activityincreases with the rise of temperature (10oC-30oC). VFA absorption and phosphaterelease s temperature coefficient is1.077and1.106respectively, phosphate absorptionand generated phosphorus s temperature coefficient is1.073and1.084respectively.Different temperatures has little effect on the metrology parameters of anaerobicreaction on sludge of biological phosphorus removal.(4) PPX are affected by anaerobic anaerobic-aerobic in circles, PKK andphosphatase s activity are not affected by anaerobic anaerobic-aerobic in circles. In thesystem of biological phosphorus removal in different temperatures, PPX， PKK andphosphatase s activity are affected by temperature，but the transformation of VOA,SOP and the generation of poly-P have not a consistent changing-tendency with PPX，PKK and phosphatase s activity. So PPK may be not a key enzyme leading todifferences in phosphorus-accumulating under different temperatures. PPX andphosphatase may be not the key enzyme of phosphorus-release in differenttemperatures.(5) The instantaneous shock of temperature change has a certain influence on thesystem, Due to the restriction of the previous constant temperature for a long time, thereis distinction between instantaneous shock s influence on system and temperature slong-time changing.