|標題:||CO-CONDITIONING AND DEWATERING OF CHEMICAL SLUDGE AND WASTE ACTIVATED SLUDGE||作者:||CHANG, G. R.
LIU, J. C.
LEE, D. J.
|關鍵字:||bound water;capillary suction time (CST);conditioning;dewatering;polyelectrolyte;sludge;specific resistance to filtration (SRF);tannery||公開日期:||2001||出版社:||Taipei:National Taiwan University Dept Chem Engn||期刊:||WATER RESEARCH 35(3)||頁數:||786-794||摘要:||The conditioning and dewatering behaviors of chemical and waste activated sludges from a tannery were studied. Capillary suction time (CST), speci®c resistance to ®ltration (SRF), and bound water content were used to evaluate the sludge dewatering behaviors. Zeta potentials were also measured. Experiments were conducted on each sludge conditioned and dewatered separately, and on the sludge mixed at various ratios. Results indicate that the chemical sludge was relatively di cult to be dewatered, even in the presence of polyelectrolyte. When the waste activated sludge was mixed with the chemical sludge at ratios of 1 : 1 and 2 : 1, respectively, the dewaterability of chemical sludge improved remarkably while the relatively better dewaterability of the waste activated sludge deteriorated only to a limited extent. As the mixing ratios became 4 : 1 and 8 : 1, the dewaterability of the mixed sludge was equal to that of the waste activated sludge. The optimal polyelectrolyte dosage for the mixed sludge was equal to or less than that of the waste activated sludge. It is proposed that the chemical sludges act as skeleton builders that reduce the compressibility of the mixed sludge whose dewaterability is enhanced. Bound water contents of sludge decreased at low polyelectrolyte dosage and were not signi®cantly affected as polyelectrolyte dosage increased. Advantages and disadvantages of co-conditioning and dewatering chemical sludge and waste activated sludge were discussed.||URI:||http://ntur.lib.ntu.edu.tw//handle/246246/2006111501254536||其他識別:||246246/2006111501254536|
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