Thickening and dewatering of waste activated sludge from WWTP with semi-coke powder

ABSTRACT

Semi-coke powder was selected as the conditioner to improve waste-activated sludge (WAS) dewaterability. The specific resistance to filtration (SRF) of the conditioned WAS with 250% semi-coke powder declined significantly from 1.47 × 10¹³ m/kg to 1.82 × 10¹¹m/kg, the moisture content (MC) of filter cake also obviously decreased from 87.8% to 61.3%, and the turbidity of supernatant was lowered to 1.5–3 NTU. The low calorific value of filter cake was enhanced to 22.47 MJ/kg.

KEYWORDS:

• Semi-coke powder
• WAS
• sludge thickening
• dewatering performance
• skeleton rigid structure
• low calorific value

Acknowledgements

This work was supported by national Key Research and Development Project (No. 2018YFC0406403-1) and Beijing Natural Science Foundation (No. 8152025).

Additional information

Funding

This work was supported by the National Key Research and Development Project [No. 2018YFC0406403-1].