Vol. 11 No. 4 Nov ELECTROCHEM ISTRY ( GB ). : O 646, R : A ), 120 cm 2 ( TSM2005)

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1 ELECTROCHEM ISTRY Vol. 11 No. 4 Nov : (2005) , 2, 1, 1, 1 (1., ; 2., ) :,,., ( ),, 6 ma /cm 2 15 m in 40 L /h 1. 0, < 500CFU /L, ( GB ). : ; ; ; : O 646, R : A,.,, HW 01,, [ 1 ].,1996 :,, [ 2 ]., ( ) ( ) [ 3 ].,,,,, ;,,,,, ;,,,,, [ 4 ].,,,. [ 5 ]. [ 6 9 ],.,,, ,,,,.,,20 cm 8 cm 10 cm, ml, 3 (, ), 120 cm 2 1 mm 2 cm.,. : , : : Tel: (862538) , E2mail: Zfli@ tsme. edu. cn ( TSM2005)

2 4 : Fig. 1 The schematic diagram of experimental equipment for electrochem ical disinfection 1) settling, 2) filtrating, 3) measuring, 4) cathode, 5) anode, 6) air flow meter 1. 2,,,,, ml.,,,, [ 10 ]. 1. 3,, CFU /L ,, 30 V 6 ma /cm 2 15 m in 40 L /h 1. 0, 1. 1,,,,.,, Fe 2 + A l 3 + Fe (OH) 3 ( ) A l(oh) 3 ( ) [ 11 ],,, [ 12 ],,.,,,,,,.,, H 2 O 2 O 3 [ 13 ], ClO 2 HClO -,,.,,.,,. 1 Tab. 1 Influence of anode material on the removal rates Electrode material Fe A l C ( graphite) Ti Count of total coliform bacteria in ingoing water (CFU /L) Count of total coliform bacteria in outgoing water (CFU /L) Removal rates /% ,,1 000 ml, 30 V, 40 L /h 1. 0,. 2,,. 5 m in ;, > CFU / L; 10 m in; > 8 ma /

3 cm 2 ;15 m in; > 6 ma / cm 2, 500 CFU /L., [ 14 ],,,,.,,,,, 6 ma /cm 2 15 m in. 2 Fig. 2 Influence of current density and hydraulic reten2 tion time on the removal rates hydraulic retention time /min: 5, 10, ml, 30 V, 6 ma /cm 2 15 m in 1. 0,,, 3. 3,, 40 L /h,.,,,,,., 3 Fig. 3 The influence of air flow rate on the removal rates,,,,, 40 L /h V 6 ma /cm 2 15 m in 40 L /h, ( cm 2 /cm 3 ),, 4. 4,< 0. 7, ; 0. 7, 85%,,,,,,,,,.,,,., 4 Fig. 4 The influence of the rate of anode effective area to the inner water volume on the removal rates

4 4 : , kw h /m 3 (H 2 O ), 500 CFU /L. 3 1),, 30 V 6 ma /cm 2 15 m in 40 L /h 1. 0 ( CFU /L ), < 500 CFU /L, ( GB ) kw h /m 3 (H 2 O ). 2),,,.,,. (R efe rence s) : [ 1 ] Ma Shihao ( ), L ing Bo ( ). Hosp ital W astewater and Pollutant Treatment [ M ]. Beijing: Chem ical Industrial Press, [ 2 ] L i Zhifu (), Xu N ing( ). Study on the p rop2 erty parameters of ClO 2 for treating sewage from hosp itals [ J ]. Techniques and Equipment for Environmental Pol2 lution Control( in Chinese), 2003, 5: [ 3 ] Tang Shouyin (), Dai Youzhi (). Engi2 neering Handbook of W ater[m ]. Beijing: Chem ical In2 dustrial Press, [ 4 ] Stucki S, Kotz R, Carcer, et al. Electrochem ical wastewater treatment using high overvoltage anodes. Part 2: Anode performance and app lications [ J ]. J. App l. Electrochem., 1991, 21 (2) : [ 5 ] Rajeshwar K, Ibanez J G, Swain GM. Electrochem istry and the environment [ J ]. J. App l. Electrochem., 1994, 24: [ 6 ] Yu Q iongwei (), Zhou Yuanquan (). Study on dye wastewater treatment using the direct elec2 trolysis [ J ]. Techniques and Equipment for Environ2 mental Pollution Control ( in Chinese), 2004, 5 ( 7) : [ 7 ] L iang Hong( ), Zeng Kangmei (), Yang J i2 cheng(). Analysis on influencing factor in trea2 ting high2colority reactive dyes wastewater by multi2elec2 trodes method[ J ]. Techniques and Equipment for Envi2 ronmental Pollution Control ( in Chinese), 2004, 5 ( 4) : [ 8 ] Yang Song ( ), L i Yum ing (), Zhou J iti ( ). Treatment of aniline using Three - dimensional three - phase fluidized bed electrode [ J ]. Techniques and Equipment for Environmental Pollution Control ( in Chinese), 2004, 5 (6) : [ 9 ] J ia Chengzhi (), Luo Ping ( ), Zou Jaqing (). Reactive dye wastewater treatment by elec2 trolysis[ J ]. Environmental Engineering ( in Chinese), 2004, 22 (2) : [ 10 ] L iu Desheng (), L i Zhifu (). Environ2 mental Monitor [ M ]. Beijing: Chem ical Industrial Press, [ 11 ] Beijing Normal University ( ), Hua Zhong Normal University( ). Inorganic Chem istry [ M ]. Beijing: H igher Education Press, [ 12 ] Fu Xiancai(), Chen Ruihua (). Physi2 cal Chem istry [M ]. Beijing: H igher Education Press, [ 13 ] W ang A im in (), Qu J iuhui(), Ge J ian2 tuan (). The aduances on the mechanism s of electrochem ical treatment of organic pollutants [ J ]. Techniques and Equipment for Environmental Pollution Control( in Chinese), 2002, 3 (10) : [ 14 ] Dalian University of Technology ( ). In2 organic Chem istry [ M ]. Beijing: H igher Education Press,

5 Electrochem ical D isinfection Method to Treat W astewater from Hosp itals L I Zhi2fu 3 1, TAN Ya2dong 2, XU N ing 1, REN Shao2hong 1, ZHAO Yu 1 (1. S chool of Chem istry and Chem ical Eng ineering, Tai Shan M edica l College, Taian , China ) (2. Environm ental P rotection B ureau of Ta ian, Ta ian , China) Ab s tra c t: Electrochem ical disinfection method was used to treat wastewater from hosp itals. electrochem ical disinfection was researched by using the different anode materials. The mechanism of The results showed that when the titanium coated with noble metal(ru Pt Ir) oxide was used as an anode and stainless steel as a cathode, the current density was 6 ma /cm 2, hydraulic retention time was 15 m in, air flow rate was 40 L /h, the rate of anode effective area to the inner water volum e was 1. 0, the amount of total colibacillus was below 500 CFU /L after electrochem ical disinfection, A ll these m eet the first order of Effluent D ischarge Standard ( GB ). Ke y wo rd s: Hosp ital s wastewater, Electrochem ical disinfection, Electrode m aterial, Amount of total coliba2 cillus