DAI Hao,LI Lian-long,BAO Qiang,et al.Aerobic Composting Performance of Dredged Sediment Enhanced by Microbial Agent Addition[J].China Water & Wastewater,2021,37(13 13):70-76.
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Aerobic Composting Performance of Dredged Sediment Enhanced by Microbial Agent Addition

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 13 13 Page: 70-76 Column: Date of publication: 2021-07-01
Author(s):
DAI Hao1; LI Lian-long1; BAO Qiang1; GUAN Shi-lin1; LI Fei1; JIANG Chang-bo2; 3; 4
(1. No.3 Engineering Company Ltd. of CCCC First Harbor Engineering Company Ltd., Dalian 116083, China； 2. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China； 3. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China； 4. Engineering and Technical Center of Hunan Provincial Environmental Protection for River-lake Dredging Pollution Control, Changsha 410114, China)
Keywords:
microbial agent; aerobic composting; dredged sediment; seed germination index; C/N
Abstract:
Aerobic composting of dredged sediment has the problems of low organic matter content and slow temperature rise in high temperature stage. To deal with the problems, dominant strains were isolated from the natural composting process to prepare mixed microbial agent, and it was applied to enhance the aerobic composting performance of dredged sediment. Compared with the control group, the experimental group possessed higher rate of temperature rise and longer high temperature stage, and the days with temperature above 55 ℃ lasted for 9 days, which met the requirement of Hygienic Requirements for Harmless Disposal of Night Soil (GB 7959-2012). The addition of mixed microbial agent promoted the maturity of the compost, and seed germination index increasing from 86.9% to 96.3%. Moreover, C/N ratios of the experimental and control groups decreased by 22.0% and 14.3%, respectively, indicating that the addition of mixed microbial agent could improve the nitrogen conservation of the compost.
Last Update: 2021-07-01