References
- Vancardon , S. , Kuper , J. and Hoffmann , J. 1999 . Toxicity of chromium to activated sludge . Ecotoxicity and Environmental Safety , 42 : 16 – 21 .
- Bae , J.W. , Rhee , S.K. , Hyun , S.H. , Kim , I.S and Lee , S.T. 2000 . Layered structure of granules in upflow anaerobic sludge blanket reactor gives microbial populations resistance to metal ions . Biotechnology Letters , 22 : 1935 – 1940 .
- Chinni , S. and Yallapragda , P.R. 2000 . Toxicity of copper, cadmium, zinc and lead to Penaeus indicus postlarvae: effects of individual metals . Journal of Environmental Biology , 21 : 255 – 258 .
- APHA . Standard Methods for the Examination of Water and Wastewater, 19th Ed. , American Public Health Association, American Water Works Association and Water Environment Federation: Washington, DC, 1995
- Errecalde , O. , Seidl , M. and Campbell , P.G.C. 1998 . Influence of a low molecular weight metabolite (citrate) on the toxicity of cadmium and zinc to the unicellular green alga Selenastrum capricornutum: an exception to the free-ion model . Water Research , 32 : 419 – 429 .
- Cabrero , A. , Fernandez , A. , Mirada , F. and Carcia , J. 1998 . Effects of copper and zinc on the activated sludge bacteria growth kinetics . Water Research , 32 : 1355 – 1362 .
- Sani , R.K. , Peyton , B.M. and Brown , L.T. 2001 . Copper-induced inhibition of growth of Desulfovibrio desulfuricans G20: assessment of its toxicity and correlation with those of zinc and lead . Applied and Environmental Microbiology , 67 : 4765 – 4772 .
- Shuttleworth , K.L. and Unz , R.F. 1991 . Influence of metals and metal specification on the growth of filamentous bacteria . Water Research , 25 : 1177 – 1186 .
- Liu , Y. 2000 . Reduced growth yield of activated sludge in organic protonophore-containing batch culture . Microbial Ecology , 39 : 168 – 173 .
- Dilek , F. , Gokcay , C.F. and Yetis , U. 1991 . Effects of Cu(II) on a chemostat containing activated sludge . Environmental Technology , 12 : 1007 – 1016 .
- Madoni , P. , Davolf , D. , Gorbi , G. and Vescovf , L. 1996 . Toxic effect of heavy metals on the activated sludge protozoan community . Water Research , 30 : 135 – 144 .
- Chudoba , P. , Chevalier , J.J. , Chang , J. and Capdeville , B. 1991 . Effect of anaerobic stabilization of activated sludge on its production under batch conditions at various So/Xo ratios . Water Science and Technology , 23 : 917 – 926 .
- Chang , J. , Chudoba , P. and Capdeville , B. 1993 . Determination of the maintenance requirements of activated sludge . Water Science and Technology , 28 : 139 – 142 .
- Suthersan , S. and Ganczarczyk , J.J. 1986 . Inhibition of nitrite oxidation during nitrification: some observations . Water Pollution Research Journal of Canada , 21 : 257 – 266 .
- Rols , J.L. , Mauret , M. , Rahmani , H. , Nguyen , K.M. , Capdeville , B. , Cornier , J.C. and Deguin , A. 1994 . Population dynamics and nitrite build-up in activated sludge and biofilm processes for nitrogen removal . Water Science and Technology , 29 : 43 – 52 .
- Jensen , A.L. 1972 . Stand error of LC50 and sample size in fish bioassays . Water Research , 6 : 85 – 89 .
- Weber , C.I. 1991 . Methods for measuring the acute toxicity of effluents and receiving waters to freshwater and marine organisms . USEPA report . 1991 , Cincinnati.
- Xie , M.L. 2002 . Utilization of 8 kinds of metabolic uncouplers to reduce excess sludge production from the activated sludge process Beijing Technology and Business University . Master Thesis
- Korthals , G.W. , Bongers , M. , Fokkema , A. , Dueck , T.A. and Lexmond , T.M. 2000 . Joint toxicity of copper and zinc to a terrestrial nematode community in an acid sandy soil . Ecotoxicology , 9 : 219 – 228 .