Dynamics Research On Pressurized Aeration Biological Oxidation Process For Treating Acetaldehyde Wastewater

Acetaldehyde wastewater is a kind of organic ones, which is middle and higherconcentration, poisonous. Through looking over related literatures and materials, weexpound the feasibility of pressurized aeration biological oxidation process fortreating acetaldehyde wastewater in terms of the theory of Physical Chemistry andMicro-Biology.Under the condition of pressurized aeration, activated sludge reaction dynamicsfor treating acetaldehyde wastewater is close to activated sludge system under normalpressure. In the lab, we build pressurized aeration bioreactor and equipments, keepingpressure in the reactor stand in 0.2MPa. Water temperature is 20℃-35℃. During thecourse of experience, we choose the simulation system of pressurized aerationbiological oxidation process for treating wastewater, through adjusting inlet valveconcentration about experimental equipments, quantity of microorganism, Do, HRT,sludge loading, average staying time of biological solid parameters and so on. Wehave studied efficiency of Oxygen mass transfer, the mode of mass transfer dynamics,the mode of organic matter degradation dynamics and microorganism growthdynamics under the condition of pressurized aeration. At last we get respectivedynamics parameters and formula.According to the results of experiments, we know that pressurized aerationbiological reactor can improve aeration oxygenate competence through enhancing theconcentration of saturated Do in liquid mixture, Oxygen supply competence can beformulated: dc/dt=0.98KLa(0.93Cs-C). Using the methods to treat acetaldehydewastewater, the mode of reaction dynamics respectively is——the mode of velocityof organic matter degradation: V=5.714Se/62+Se(mg COD/mg.vss.d);the mode ofrelations of organic matter degradation and microorganism increasing:ΔX=0.2201Q(S0-Se)-0.1090VX(Kg/d);the mode of relations of organic matter degradation and Oxygen demand:Q2=0.714Q(SoB-SeB)+0.154VX0(Kg/d);Q2=0.415Q(Soc-Sec)+0.116VX(Kg/d).The results of research can provide reference frame for design and running ofsystem about pressurized aeration biological oxidation process to treat acetaldehydewastewater.