Research on the Improvement of Sludge Dewatering Performance by Electroflocculation
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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