ZHOUWei-qi,FANGNing,GUOYa-li,et al.Treatment Technology Path Based on the Characteristics of Multi-source Sludge[J].China Water & Wastewater,2022,38(19):16-22.
Treatment Technology Path Based on the Characteristics of Multi-source Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第19期
Page:
16-22
Column:
Date of publication:
2022-10-01
- Keywords:
- great protection of the Yangtze River; multi-source sludge; organic matter; sand content; calorific value; heavy metals; trace pollutants
- Abstract:
- The organic matter, sand content, calorific value, heavy metals, trace pollutants and other indicators of typical municipal sewage sludge, ditch sludge and sediment from rivers and lakes in the Yangtze River economic belt were collected and analyzed. The results showed that the organic matter content of sewage sludge was 30%-50%, and its calorific value was generally in the range of 5 500-11 000 kJ/kgDS; the calorific value of sewage sludge had a great relationship with the organic matter content, that was, the more the organic matter content, the higher the calorific value of sludge; the sand content was high, the nutrient content of sludge was 6%-8%; the heavy metal content was low, and the heavy metals in more than 95% of dehydrated sludge were far lower than the limit of class A criteria specified in the Control Standards of Pollutants in Sludge for Agricultural Use (GB 4284-2018), and at relatively clean level, with low concentration of PAHs and low risk. The composition of ditch sludge was complex, and the organic matter content ranged from 5% to 90%, which was usually low in calorific value and nutrients. The content of organic matter in sediment of river and lake was less than 10%, and the calorific value was low, less than 1 000 kJ/kgDS, with low fertility. The heavy metal content of ditch sludge and sediment of river and lake met the first category screening value of Soil Environmental Quality Risk Control Standard for Soil Contamination of Development Land (GB 36600-2018), which could be used for construction land of residential areas.
Last Update:
2022-10-01