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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 COD_Cr (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.

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