The Exprimental Study Of Coagulation And Adsorption Cooperative Treatment For LAS On Bathing Wastewater

Bathing wastewater has large volume, light pollution, stable water quality characteristics,asa kind of quality-recycled water source, the paper treat the bathing wastewate by coagulation andadsorption combined processes. The turbidity and LAS of effluent can reach reclaimed waterstandard.Compared with testing result of four different coagulants show that the order of removalefficiency on LAS is:PAC>PFS>Fecl3>Al2(SO4)3.Choosing PAC for coagulants, under thecondition of not to change simulated water temperature and pH, getting LAS removal rate of theprimary factors for the order through orthogonal test is：dosing quantity of coagulant，stirringvelocity， static settling time，stirring time.Better level condition of factors is：PAC dosingquantity45mg/L, speed: medium speed150r/min, slow speed50r/min, static settling time10min, stirring time: medium speed mixing3min, slow speed mixing10min. Compared withadsorption effect of five different adsorbents show that the order of removal efficiency on LASis: activated carbon>fly ash> zeolite> bentonite> volcanic rock, although the activated carbon tothe removal rate of LAS better than fly ash, from the view of economy, choosing fly ash asadsorbent，getting LAS removal rate of the primary factors for the order through orthogonal testis：dosing quantity of adsorbent,temperature, adsorption time,pH. Better level condition offactors is：fly ash dosing quantity50g/L,temperatrue25℃，adsorption time80min，pH6. Fly ashadsorption performance of LAS in simulated water better comply with Freundlich adsorptionisothermal.By comparing with the results of PAC coagulation and fly ash adsorption different orderprocessing bathing wastewater found the effect of firstly ues PAC coagulation and then fly ashadsorption is the best for bathing wastewater.we conduct on a enhanced coagulation test withPAM and chitosan for PAC show that the effect of removing turbidity by enhanced coagulationwith PAM and chitosan is very good,but LAS can not reach reclaimed water standard.Comparedwith fly ash shots and dosing quantity combination experimental results indicated that best flyash shot with coagulation began after4min，The optimal dosing quantity combination isPAC30mg/L+fly ash30g/L, which can make the bathing wastewater effluent water to reachreclaimed water standard.