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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (5): 719-723    DOI: 10.1631/jzus.2007.A0719
Environmental and Energy Engineering     
Enhanced primary treatment of low-concentration municipal wastewater by means of bio-flocculant Pullulan
YANG Kai, YANG Xiao-Jun, YANG Mo
School of Civil Engineering, Wuhan University, Wuhan 430072, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
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Abstract  Jar tests were conducted to investigate the performance of enhanced primary treatment processes for low-concentration municipal wastewater from South China by using composite flocculant combined with bio-flocculants Pullulan and poly-aluminum-chloride (PAC). The optimum dosage for composite flocculant and conditions for flocculation were determined. The experimental results indicated that composite flocculant had high efficiency for removing over 95% of turbidity, over 58% of CODCr (chemical oxygen demand determined with potassium dichromate), over 91% of TP (total phosphate), and over 15% of NH3-N. Moreover, it could improve sludge settling and dehydration properties, and decrease the treatment cost.

Key words： Bio-flocculant      Pullulan      Enhanced primary treatment     
Received: 16 April 2006     
CLC:  TU992  
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YANG Kai
YANG Xiao-Jun
YANG Mo
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YANG Kai, YANG Xiao-Jun, YANG Mo. Enhanced primary treatment of low-concentration municipal wastewater by means of bio-flocculant Pullulan. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(5): 719-723.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A0719     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I5/719

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