The effects of operating parameters such as electrocoagulation voltage,electrode spacing,initial pH of sludge,and anode material on sludge dewatering efficiency was investigated.The results showed that when the voltage was 16 V and electrocoagulation was lasted for 20 minutes,the water content of the dehydrated sludge and SRF decreased by 15%and 1.74×1013 m/kg,respectively,compared with the original sludge.It has a better dewatering performance when 40 mm of the spacing between electrodes and using iron anode.When the initial pH value of sludge was 3～5,the water content after sludge dewatering and SRF decreased by about 7.79%and 1.54×1013 m/kg,respectively.By optimizing the operating parameters of the response surface method,it was found that the sludge dewatering performance was optimum when 3.03 of the initial pH,16.22 V of voltage and lasting for 18.61 min,and the water content and SRF was 57.86%and 5.5×1011 m/kg,which was 2.16%and 7.7×1012 m/kg lower than that of the single factor experiment,respectively.
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