TIANXia-di,ZHANGShu-jun,Lü Xin-tao,et al.Advanced Treatment of Landfill Leachate Biochemical Effluent and the Release Characteristics of Organics from Coagulated Sludge[J].China Water & Wastewater,2023,39(19):33-40.
Advanced Treatment of Landfill Leachate Biochemical Effluent and the Release Characteristics of Organics from Coagulated Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第19期
Page:
33-40
Column:
Date of publication:
2023-10-01
- Abstract:
- This paper proposed a non-membrane process consisting of coagulation, air floatation and advanced oxidation, and investigated the coagulation process, so as to solve the problem of organic residues in the effluent from anaerobic ammonia oxidation for treating landfill leachate. The effects of factors such as coagulant type, coagulant dosage and pH on the removal of organic matter were investigated, and an pilot-scale orthogonal test was carried out. In addition, the change of organic matter before and after coagulation and the release characteristics of organic matter in coagulated sludge after pressure filtration dehydration were also analyzed. The optimal coagulation process were as follows: the pH was 5.75, the dosage of polymerized ferric sulfate (PFS) was 1 500 mg/L and the dosage of polyacrylamide (PAM) was 2 mg/L. Under these conditions, the removal rates of TOC, COD, UV254 and chroma reached 79.84%, 67.57%, 88.55% and 95.00%, respectively. The pilot-scale orthogonal test results showed that pH was the most important factor affecting the coagulation process, and the optimal operating conditions were consistent with the bench-scale test results, which proved that the experimental results were reliable. The three-dimensional fluorescence data showed that coagulation removed almost all of the humic acid. The results of gel permeation chromatography (GPC) showed that the molecular weight of organic matter decreased after coagulation treatment. In addition, the amount of organic matter released from the coagulated sludge was small and the release rate gradually tended to be stable, indicating that the risk of pollutants secondary release was small.
Last Update:
2023-10-01