A Preliminary Study On Controllong Technology Of Toxic Organic Pollutantsin Mgp-wastewater

According to Potential damages and current pollution situation of toxic orgnic inPearI river Delta, the MGP(manufacture gas from petroleum)-wastewater is selected tobe our research object, and isolating high efficiency bacteria and designing new type ofbioreactor are the means to improve MGP-wastewater beatment efficiency. Thisdissertation includes: investigations and analysis of wastewater characteristics,acclimating and isolating bacteria which can biodegrade MGP-wastewatef,biodegradation of toxic organic with acclimated bacteria and the influences ofenvironmental facts, oxygen transfer characteristic of fluidized-bed reactor, dynamictreatment of wanewater with coupling technics.Applying the GC/MS instrument and refering to U.S.EPA QA/QC method, thequantitative analysis of aromatic compounds in MGP-wastewater is carried out. About 80toxic organic compounds are detected by GC/MS analysis, and 23 compounds have beenstrictly limited to discharge by several cotuntries or districts. The total removal rate ofaromatic compounds is only 7.6%. We can make a conclusion that the removal of toxicorganic in wastewatr is more important even NH₄⁺-N is at a high level,. The original activated sludge technics is incompetent to treat MGP-wastewater.Among all of the l6 isolated bacteria, S-2,Y-3 and XH-3 have better ability ofbiodegrading MGP-wastewater than other l2 species of bacteria. These 3 bacteria canremove COD about 38-44%, and the COD removal rate is improved about 16.9²6.5%after adding dextrose or ethanol. S-2, Y-3 and XH-3 can remove the total aromaticcompounds about 47. 1 ⁵1 .2%, and the removal rate can be improved about 15.4²1 .7%when dextrose or ethanol is existing in the wastewater. These 3 bacteria have good abilityof biodegrading aromatic compound which has less than 3 aromatic ring, but, they haveweak ability of biodegrading aromatic compound which has 4～6 aromatic ring.The operation and structure parameters that established by study on oxygen transfercharacteristic are applied to the dynamic wastewater treatment. The technics of couplingacclimated bacteria and fluidized-bed reactor is running good, this technics has a goodability of biodegrading aromatic compounds. When retention time is 5 hours, the totalaromatic compounds removal rate is 79.8%. All the results show that the couplingtechnics has a priority of treating toxic organic wastewater.The innovation and feature of this study: (1) Applying the GC/MS analysis andrefering to U.S.EPA QA/QC method, we carried out the quantitative anaIysis of aromaticcomPOunds in MGP-wastewateL About 80 toxic organic comPOunds are detected byGCMS analysis, and 23 comPOunds have been strictly limited to charge by severalcountries or districts. Also the quantitative analysis is applied tO study the biodegradationlaw of aromatic comPOunds in MGP-wastewateL (2) With GC/MS analysis, toxiccompounds in actUal wastewaer but preparing water have been stUdied. (3) Theacclimat6d bacteha and bioIogical fluidized bed are coupled to trCat MGP-wastewateF,and good wastewater treatment resuIts are gained.