FEASIBILITY INVESTIGATION ON AEROBIC COMPOSTING OF MUNICIPAL SLUDGE SUPPLEMENTED WITH LESS PROPORTION OF GREEN WASTE

XIONG Ying; BAI Dong-rui; ZHANG Tao; LIU Yi; LIU Yan-ting; CHEN Tan; WANG Hong-tao; YANG Ting; JIN Jun; ZHOU Ping; GUO Fang

doi:10.13205/j.hjgc.202103022

Volume 39 Issue 3

Jul. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(3): 153-160

XIONG Ying, BAI Dong-rui, ZHANG Tao, LIU Yi, LIU Yan-ting, CHEN Tan, WANG Hong-tao, YANG Ting, JIN Jun, ZHOU Ping, GUO Fang. FEASIBILITY INVESTIGATION ON AEROBIC COMPOSTING OF MUNICIPAL SLUDGE SUPPLEMENTED WITH LESS PROPORTION OF GREEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(3): 153-160. doi: 10.13205/j.hjgc.202103022

Citation:

XIONG Ying, BAI Dong-rui, ZHANG Tao, LIU Yi, LIU Yan-ting, CHEN Tan, WANG Hong-tao, YANG Ting, JIN Jun, ZHOU Ping, GUO Fang. FEASIBILITY INVESTIGATION ON AEROBIC COMPOSTING OF MUNICIPAL SLUDGE SUPPLEMENTED WITH LESS PROPORTION OF GREEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(3): 153-160. doi: 10.13205/j.hjgc.202103022

Citation:

XIONG Ying, BAI Dong-rui, ZHANG Tao, LIU Yi, LIU Yan-ting, CHEN Tan, WANG Hong-tao, YANG Ting, JIN Jun, ZHOU Ping, GUO Fang. FEASIBILITY INVESTIGATION ON AEROBIC COMPOSTING OF MUNICIPAL SLUDGE SUPPLEMENTED WITH LESS PROPORTION OF GREEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(3): 153-160. doi: 10.13205/j.hjgc.202103022

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FEASIBILITY INVESTIGATION ON AEROBIC COMPOSTING OF MUNICIPAL SLUDGE SUPPLEMENTED WITH LESS PROPORTION OF GREEN WASTE

doi: 10.13205/j.hjgc.202103022

1. College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China;
2. School of Environment, Tsinghua University, Beijing 100084, China;
3. Kunming Dianchi Water Treatment Co., Ltd, Kunming 650228, China

Received Date: 2020-04-06
Available Online: 2021-07-19

Abstract

Abstract

In order to verify the feasibility of the aerobic composting process of municipal sludge supplemented with less proportion of green waste, the returned sludge composting product was used to replace the green waste as an aggregate, and the dewatered municipal sludge was treated by the static turn-over aerobic composting process. The indicators of the composting process and products were determined. When the green waste was partially replaced by the returned sludge composting product, the high temperature period of the heap (≥ 55℃) was not less than 3 days, the moisture content of the product was lower than 40%, the volatile solid content (VS) exceeded 45%, the pH value was stable at 6.0~7.0, and the seed germination index (GI) was higher than 70%, which could meet the requirements of landscaping application. Among them, the composting heap of the mass ratio at 5:1.5:1 of dewatered municipal sludge, green waste and returned sludge composting product, could be controlled within 27 d, and the contents of total nitrogen, total phosphorus, total potassium and humic acid in the primary fermentation products were higher, indicating a better fertilizer effect. This proportional composting material ratio was suitable for landscaping in engineering applications. In the test groups, in which the returned sludge composting product completely replaced the green waste, the composting heaps of the mass ratio at 5:6 and 5:8 of dewatered municipal sludge and returned sludge composting product could meet the high temperature requirements (not less than 55℃ and maintaining 3 d at least), the parameters such as VS, pH, nutrients, ascaris egg mortality and fecal coliform count met the sludge quality requirements applying of landscaping and as organic fertilizer, and the period of primary fermentation could be controlled within 16 d. When the mass ratio of the returned sludge composting product to the dewatered municipal sludge was no more than 6/5, the GI exceeded 90%, which met the requirements of maturity. Replacing green waste by returned sludge composting products as aggregate for municipal sludge composting can effectively adjust the properties of dewatered municipal sludge, shorten the composting cycle, and improve the product fertility.
- municipal sludge,
- aerobic compost,
- green waste,
- composting product return,
- aggregate replacement

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References(27)

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