2010•Environmental Science & TechnologyRequires access
Treatment of Printing and Dyeing Wastewater with Use of Both Yttrium Nitrate and Carboxymethyl Chitosan
Huili Sun
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Abstract
The effectiveness of Yttrium nitrate,carboxymethyl chitosan and their composite as a flocculant to printing and dyeing wastewater was investigated which was on based on the dosage of carboxymethyl chitosan of 480mg/L,pH=2.3.It was discovered that there were two influencing factors which were the dosage of rare earth and temperature.The best dosage of rare earth of Yttrium for treatment were found to 5mg/L and the best temperature was 50℃.Then the chroma and the turbidity of printing and dyeing waste water could be reduced by over 99%,the chemical oxygen demand(COD) could be reduced by 76.59%,the ammonia nitrogen(NH3-N) could be reduced by 77.12%.Contrarily,the effect with only use of carboxymethyl chitosan was unevidence.