### The best combination of parameters for electroosmosis dehydration of sewage sludge

WU Zhuoyu1, LIANG Yaoxuan2, ZHANG Shujuan1, ZHANG Xulan1, CAI Baihua1

1. 1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510000, China；
2. Dongguan Environmental Protection Industry Promotion Cente, Dongguan 523000, China

• Received:2020-01-09 Online:2020-07-08 Published:2020-07-08

Abstract:

As a new technology of sludge dehydration, electro-osmotic dehydration has the advantages of good dehydration effect, low cost and without flocculant. Through two rounds of orthogonal experiments and by using moisture content of sludge and dewatering energy consumption as evaluation system, this study investigated the combination of optimal operating parameters of mechanical pressure, electroosmosis time, voltage gradient and sludge thickness. After shrinking range of parameters by the first orthogonal experiment, the second orthogonal experiment was carried out. Finally, the optimal operation parameters were determined as follows: mechanical pressure was between 14.6 and 15.0 kPa, and electroosmosis time was between 58.7 and 70 min, and voltage gradient was between 15.1 and 16.1 V/cm, and sludge thickness was 0.50 cm. After dewatering, the moisture content of sludge was between 55.00% and 58.00%, and ewatering energy consumption was between 0.110 and 0.120 kW·h/kg. The optimal operation parameters obtained through two rounds of orthogonal experiments, the moisture content of sludge can achieve the standards and energy consumption is only 9% to 19% of thermal drying.

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