YANYing-ying,MENGChun-lin,ZANGXing-hua,et al.Design and Operation of the Emergency Project for Deep Dewatering of Sludge in Shenzhen[J].China Water & Wastewater,2022,38(4):120-124.
Design and Operation of the Emergency Project for Deep Dewatering of Sludge in Shenzhen
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第4期
Page:
120-124
Column:
Date of publication:
2022-02-17
- Abstract:
- Due to the lack of local sludge disposal capacity, about 60% of the sludge in Shenzhen is still exported for disposal, which means a long transportation distance and high disposal price. At the beginning of 2019, Shenzhen Fuyong WWTP transported the sludge with a water content of 80% after centrifugal dewatering to China Resources Power Haifeng Power Plant, which is 183 km away, for mixed burning with a total daily cost of about 62 352 yuan. Since May 2019, the emergency project for deep dewatering of sludge has been implemented. The deep dewatering belt dehydrator that can be connected with the current centrifugal dewatering system has been used to reduce the sludge water content from 80% to 60% and reduce the sludge transport volume from 120 t/d to 68.3 t/d through chemical conditioning and mechanical pressing with significant reduction effect. Besides, the total cost of sludge treatment and disposal has also decreased to 44 315 yuan/d, with obvious economic benefits. In addition, the appearance of the sludge after deep dewatering changes from a lumpy plastic state to a sheet?like semi?solid state, which is conducive to long?distance transportation and power plant co?processing. The calorific value of sludge increased from -0.96 MJ/kg to 0.69 MJ/kg. The emergency project of sludge deep dewatering has been running stably for over a year, whose design and operation experience can provide references.
Last Update:
2022-02-17