Lignin Flocculation And Sedimentation - Lime Addition To Sulfate - Off The Ammonia-sbr Processing Of Monosodium Glutamate Wastewater

Glutamate wastewater is a kind of high concentration organic wastewater. Withhigh acidity, high ammonia concentration, high sulphate concentration and highorganic pollutant concentration, glutamate waStewater could not be treatedsuccessfully with simple traditional method. In this study, physi-chemical andbiological treatment technique were combined, and a new method of glutamatewastewater treatment was proposed and tested. The research included thefOllowing parts.Flocculation treatment of glutamate wastewater with lignin was studied and theaffecting factors were optimized, which included the amount of nocculant andflocculant assistant used, temperature, and acidity. Aboat 55% COD (chemicaloxygen demand) in glutamate wastewater could be removed after flocculationtreatment.Because the high concentration of ammonia and sulphate could causeenvironmental pollution and bring negative effeCt on the fOllowing bio-treatment,removal of both of them is necessary. Calcium oxide was used to neutralize theacidic glutamate wastewater and precipitate the high concentration of SO.'-. TheoPtimized amount' of calcium oxide added was abQut 20 grams per liter wastewater,and the concentration of SO.'- could be reduced from 8000 milligrams per liter toabout 450 milligrPms per liter, with removing rate higher than 90%. Experimentalresults of ammonia removal showed that pH and the ratio of air to wastewater hadthe greatest effect on the percentage of ammonia removed. The higher the pH, thehigher the removal rate was.After series of physi-chemical pretreatment, about 55% COD, 90% sulphate andmore than 70% ammonia were removed from the glutamate wastewater.Afterwards, the pretreated glutamate wastewater was diluted and further treatedwith sequencing batch reactor (SBR), Experiment results showed that, afteraerobic activated sludge bio-treating for 24 hours, about 77% to 87% COD in thewastewater was removed. It could be fOund that the series of physi-chemicalpretreatment made the biotreament easy and practical.