Experiment Research On Treatment Of Coking Wastewater With New Biofilm Carrier

Coke plant wastewater is a kind of intractable waste water which is from the process of making coke, purifying coal gas and recovering the coke products.Components are complex in coke plant wastewater, in which contain high concentration of ammonia-nitrogen and a number of toxic and difficult decompounded organic compounds. Great changes usually happened to the quality of water and the flow of water. Conventional coke plant wastewater treatment processes adopted activated sludge method, though which the removal of COD and ammonia-nitrogen were dissatisfied and the effluent concentration couldn't attain the standards of draining wastewater. These brought severe harm to our environment and the health of human.Erobic fluidized bed that added a new biofilm carrie was used to treat High Consistency Coking Waste Water. The reactor was inoculated with sludge comes form a coke plant and the new biofilm carrie.After cultivated for 25 days ,when the normal running of reactor, the biomass concentration reached 4.196 gMLVSS/L. Watch by microscope, some protozoan and metazoan such as rotifers on the aerobic biological membrane were found. Influent COD,NH₃-N, volatile phenols and total phenols are 3000,40⁶0,100 and 130mg/L, Removal rate of COD about 80%; Removal rate of NH₃-N and volatile phenols are chose to 100%; Removal rate total phenols is upwards 95%.the effect of HRT, DO concentration,and pH on the COD and NH₃-N removal efficiency and nitrite accumulation rate was investigated respectively.The Tolerance Ability of the biomembrane to COD load was also surveyed .Then, technological parameters'Distinctiveness were surveyed by Orthogonal experiment in the reactor.the Determination of technological parameters are as follow Influent COD is 2500³000mg/L,pH is 7.5⁸,DO concentration is 2⁵mg/L. degradation kinetics of COD was Prelimenary studied , the calculating result indicated that degradation of COD is approximate first class response. Saturation constant Ksand Maximum Reaction Rate V_max were calculated, K_s is 5473.22mg/L, V_max is 0.1375h^-1.SND effect of the reactor was studied when the NH₃-N load was higher as before. the effect of DO COD/NH₃-N and so on on the SND effect were surveyed. Experimental results showed that, when Influent NH₃-N was 100²00 and Influent TN was 150²50mg/L, Removal rate of TN was about 50%, when the reaction conditions were controlled strictly as follows:DO concentration 2.5³.5mg/L, COD/NH₃-N at above 10. By two-stage fluidized bed'running,when Influent COD was about 3000mg/L, Influent NH₃-N was 150mg/L, the effluent COD was up to standard,and Removal rate of TN was about 80%.Pilot-testing that the new biofilm carrie was used was also studied , Experimental results showed that, by two-stage fluidized bed running, when HRT was 20h,could got Effective treatment,when Influent COD was about 3000mg/L, Influent NH₃-N was 60¹00mg/L and Influent volatile phenols was 600mg/L.The Removal rates was about 97%,99% and 75%...