废水处理流程设计及原理WastewaterTreatmentProcess.ppt
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1、Wastewater Treatment,Primary treatment Secondary treatment Tertiary treatment - N, P Advanced treatment Design of sedimentation basin ; overflow rate,Introduction to Environmental Engineering and Science , G.M. Masters & W.P. Ela, 2008,Chemical Treatment, : ; 2 - : Al2(SO4)318H2O, Al2(SO4)3 14H2O -
2、(III) : FeCl3 - (III) : Fe2(SO4)3, Fe2(SO4)3 3H2O - (II) : FeSO4 7H2O - : Ca(OH)2, ,Activated sludge process (biological aeration), , (Activated Sludge Process), , ,Trickling filter,Rotating biological contactor,Sludge treatment 2% of the orginal volume, 97% water,Water Treatment Process (Drinking w
3、ater production), Screening 1. Mixing : Rapid Mixing 2. Coagulation, Alum (Al2(SO4)3 18 H2O), Ca(OH)2, Na2CO3 3. Flocculation 4. Sedimentation, Sludge Processing 5. Filtration, Sand, Activated Carbon 6. Disinfection, Cl2, NaOCl, Ca(OCl)2, O3,prechlorination,Raw water,Rapid mixing coagulation,floccul
4、ation,Conventional water treatment process?,Sedimentation,filtration,disinfection,postchlorination,Conventional water treatment process? ?, , ,Water Treatment Process?,Coagulation - destabilize the colloidal particles & to overcome the negative charge of particles with chemical addition Flocculation
5、 - gently mix the destabilized particles to promote interparticle collisions in order to achieve particle growth,Drinking Water Standard, , , WHO . WHO (, , ) .,Drinking Water Standard, (Drinking water standard (disinfection), , , ,(HPC), (Total Coliforms), , (Residual Chrorine),100CFU/mL (1mL 100 )
6、,ND/100mL (100 mL ),0.2 mg/L ( 1.5 mg/L),0.4 mg/L ( ), (Turbidity),1 NTU 0.5 NTU (2001 7 1), (Fecal Coliforms),(E.coli),ND/100mL (100 mL ),ND/100mL (100 mL ), (Disinfection byproducts),THMs () and Other Halogenated DBPs,Factors ( ),pH time () temperature (, ) organics ( ) chlorine does ( ) bromide (
7、),HOCl + Br- + NOM,Commonly Identified disinfection by-products,Chlorination,Chlorine dioxide,Ozonation,Trihalomethanes,Haloacetic acids,Haloacetonitriles,Haloketones,Chloropicrin,Chloral hydrate,Cyanogen Chloride,Chlorophenols,N-organochloramines,Chlorine dioxde,Chlorite,Chlorate,Aldehydes,Organic
8、acids,Ketones,Epoxides,Quinones,Chlorate,Bromate,Iodate,Disinfection :,Byproducts :,Disinfection byproducts,THMs(Trihalomethanes),HANs(Haloacetonitriles),Bromoform, THMs DBPs Fomula,Haloacetic acids,Haloacetonitriles,Disinfection and Disinfection byproducts,Risk, : , ( ) (Option), , ,Membrane Techno
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