References
- Hutchins , R.A. 1973 . Activated carbon system . Chem. Eng. , 80 : 133 – 138 .
- Watson , M.R. 1973 . Pollution control of metal Finishing , 90 – 135 . London : NDC .
- Lee , S.E. , Shin , H.S. and Paik , B.C. 1989 . Treatment of Cr(VI)‐containing waste water by addition of powdered activated carbon to the activated sludge process . Water Res. , 23 (1) : 67 – 72 .
- Huang , C.P. and Wu , M.H. 1975 . Chromium removal by carbon adsorption . J. Water Pollut. Control Fed. , 47 : 2437 – 2446 .
- Srivastava , H.C.P. and Mathur , R.P. 1986 . and Indu Mehrotra, Removal of chromium from industrial effluents by adsorption on sawdust . Environ. Technol. Lett. , 7 : 55 – 63 .
- Tan , W.T. , Rahman , Abd. and Khan , M. 1989 . Removal of lead, cadmium and zinc by waste tea leaves . Environ. Technol. Lett. , 9 (11) : 1223 – 1231 .
- Tan , K.K. , Tan , W.T. and Mok , P.H. . Removal of lead by rice straw . Proceedings of 1988 Conference of Hazardous Waste Research . Hololulu. Feb. , paper no. 11
- Tan , W.T. , Chong , N.Y. and Lee , C.K. 1989 . Removal of chromium(III) by coconut hasuk and rice straw . 3rd Asian Chemical Conference . August 1989 , Brisbane, Australia.
- Department of Statistics . 1985 . Malaysia and Ministry of Agriculture Malaysia
- Tong , C.C. and Hamzah , N.H. 1989 . Biochemistry Department, Universiti Pertanian Malaysia , Private Communication .
- Coleman , R.N. and Para , J.H.M. 1991 . Biofilm concentration of chromium . Environ. Technol. , 12 : 1079 – 1093 .
- Poots , V.J.P. , Mckay , G. and Healy , J.J. 1976 . The removal of acid dye from effluent using natural adsorbent‐wood . Water Res. , 10 : 1067 – 1070 .