Study On Adsorption Of Modified Bentonite Combines With Coagulation To Treatment Micro-polluted Source Water

With the aggravation of pollution of drinking water，the conventionaltreatment process can not satisfy people’s demand In order to remove ammonianitrogen，COD_Mnand turbidity，It uses the bentonite which rich in our countryand low in price and its modified or other adsorption material which compositewith，combined with the coagulant to treatment the micro-polluted source wateraccording to coagulation. To explore the excellent adsorbent and the new way.In this study，the actual micro-polluted source water samples for testing.，including coagulant screening，bentonite modified and composite with otheradsorbent，combined with the coagulant. The results are as follows:The use of PFS and PAC as coagulant，PAM and chitosan as a coagulant totreatment the micro-polluted source water for coagulation tests. The results showthat PAC is better than the PFS，chitosan is better than the PAM. PAC as acoagulant，chitosan as a coagulant to treatment the micro-polluted source water，the removal rates of turbidity and COD_Mnare95.2%、32.3%，but it has littleeffect on ammonia removal.After bentonite has been modified by heat，acid，and bentonite，activatedcarbon， zeolite，chitosan are composited and modified，then use of modified materials as well as PAC and chitosan to treatment the micro-polluted sourcewater according adsorption-flocculation tests. The results show that bentonite bycarbon-entraining roasting has the best effect to remove ammonia and COD_Mn，the removal rate of turbidity is relatively high. Revealing the mechanism ofadsorption-flocculation Making sure the best modified conditions: joining theactive carbon2%，roasting to burn time as2hour under450℃.The single factors test of adsorption-flocculation uses bentonite bycarbon-entraining roasting as well as PAC and chitosan show that，adsorptiontime，adsorption stirring intensity，PAC dosage，chitosan dosage，mixingintensity，mixing time，mixing flocculation strength，flocculation time，settlingtime，pH，and the dosing method of the composite materials are have effect toadsorption-flocculation. To make sure the best hydraulic conditions，the bestdosage and the dosing method. To provide the theoretical basis for practicalapplication.The removal rates of Adsorption-flocculation ammonia，COD_Mnandturbidity using adsorption-flocculation to treatment the micro-pollutedsource water are56.74%、65.38%、97.42%。 Bentonite by carbon-entraining roasting is the excellent adsorbent to removeammonia and COD_Mn，adsorption-flocculation as well as PAC and chitosanis the new way to treatment the micro-polluted source water.