Study on Treatment of Suddenly Polluted by Ammonian and Organic Matter Raw Water
|School||South China University of Technology|
|Keywords||polluted suddenly water aerated biological activated carbon filter ammonia odor CODMn|
Ammonia, odor and organic sudden pollution will occur in Dongguan reaches ofDongjiang River during rainy season due to inland drainage, bring a serious challenge to thewater plants within this basin for supplying quality drinking water continuously, to satisfy thesupplying goal of water plants, this study was carried out. The water quality characteristics ofthis basin are representative in south China, therefore, the study results have significance ofpromotion.Aerated biological activated carbon filter was placed between sedimentation tank andsand filter as a new water purification unit, then a pilot test of15m3/h was carried out in awater plant in Dongguan City, to study the treatment effect of combined process when waterocuur odor ammonia and organic pollution, the test results showed that:(1) The odor causing substances of Dongguan reaches of Dongjiang River during watersudden pollution were mainly reductive odor causing substances, potassium permanganatepre-oxidation can effectively remove such odor causing substances. The average removal rateof TON was95.1%via potassium permanganate pre-oxidation strengthening the conventionaltreatment process, deodorizing effect of potassium permanganate combined with powderactivated carbon was not increased obviously, the average removal rate of TON was only95.4%.(2) BAC have certain buffer to sudden ammonia pollution ammonia of water. whenwater burst micro-ammonia pollution, the ammonia of BAC effluent satisfied the test goal ofless than0.5mg/L, and after about nine hours the removal rate of ammonia by BAC wasstabilized at around90%; on the initial stage of water burst high-ammonia pollution, theammonia of BAC effluent exceeded0.5mg/L, however, the ammonia of BAC effluentre-stabilized below0.5mg/L, and the removal rate of ammonia was about85%after14hours.(3) The odor causing substances and CODMnremoval by BAC depends mainly onactivated carbon adsorption and biodegradation, compared to conventional strengthening, theCODMnand odor removal efficiency of test process were all increased; however, odor causing substances could not be romoved completed at some time, there was still no guarantee thatCODMnwas degradated to less than2.0mg/L when water occur sudden high-ammoniapollution.(4) After nitrifying bacteria growth promoters was dosed two weeks a time, when BACmet micro-ammonia pollution and high-ammonia pollution, the effluent ammonia were lessvolatile, only increased to the value that to the influent ammonia concentration.1.22~1.31mg/L influent ammonia concentration was corresponded to effluent ammonia concentration of0.08~0.11mg/L,1.94~2.05mg/L influent ammonia concentration was corresponded to effluentammonia concentration of0.18~0.23mg/L, and BAC could removed4.0mg/L influentammonia to below0.5mg/L.(5) Dosing nitrifying bacteria growth promoters two weeks a time, and pre-dosing1.0mg/L potassium permanganate when water ocuur sudden pollution, not only the removal ofammonia of test process were efficient, and aslo odor causing substances were removedcompletly, and CODMnaccompanied with high ammonia pollution was removed to less than2.0mg/L.