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Zhang, Hong-Zhong
- Effect of a New Bulking Agent on Sewage Sludge Composting
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Authors
Affiliations
1 Zhengzhou University of Light Industry/Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan Province, Zhengzhou 450001, CN
1 Zhengzhou University of Light Industry/Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan Province, Zhengzhou 450001, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 1 (2015), Pagination: 133-136Abstract
To improve bulking agent (BA) reusability and reduce bulking agent costs, a new bulking agent was developed using straw and methylene diphenyl diisocyanate. The objective of this study was to investigate the effect of the new bulking agent on sewage sludge composting. The results showed that the new bulking agent has high recovery ratio when used in sewage sludge composting, and can improve the composting process. Decreasing the mass ratio of sewage sludge to bulking agent from 3:1 to 2.5:1 in compost pile improved the rate of temperature increase, increased the maximum temperature, shortened the thermophilic stage of the composting process, and achieved an even temperature distribution during the initial heating phase. The recovery ratios for the bulking agent with mass ratios of 3:1 and 2.5:1 were 94.7% and 92.2%, respectively. The recovery and reuse of this new bulking agent could significantly reduce the cost of bulking agents in the composting of sewage sludge, and the appropriate mass ratio of sewage sludge to bulking agent is 2.5:1.Keywords
Bulking Agent, Sewage Sludge, Composting Recovery Ratio.Full Text
- Effect of Ventilation Modes on Production and Emission of Volatile Organic Compounds During Sewage Sludge Composting
Abstract Views :142 |
PDF Views:0
Authors
Affiliations
1 Zhengzhou University of Light Industry, Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan Province, Zhengzhou 450001, CN
1 Zhengzhou University of Light Industry, Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan Province, Zhengzhou 450001, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 4 (2016), Pagination: 1263-1266Abstract
To investigate the relationship between ventilation modes and volatile organic compounds (VOCs) production and emission properties during sludge composting, two trials were conducted with different ventilation modes, the large ventilation rate for a short ventilation time (T1) and the small ventilation rate for a long ventilation time (T2). The VOCs were qualitatively and quantitatively monitored by gas chromatography-mass spectrometer (GC-MS). The results show that, the mass concentration of VOCs produced and emitted in the composting process of T2 is significantly higher than that of T1, the total VOC mass concentration of T1 and T2 during sewage sludge composting were 34052.0 μg·m-3 and 48476.6 μg·m-3, respectively. Total VOCs (TVOCs) emission concentration is 710.8 μg·m-3 and 1790.8 μg·m-3, respectively. Compared with the production of TVOCs, the emission of T1 and T2 were reduced by 97.9% and 97.9% respectively; the main VOCs components produced by two treatments are different, for T1, the production of olefin is the largest, accounting for 76.43% of the TVOCs. T2 produces the largest amount of oxygen-containing organic plant-based VOCs, accounting for 89.23% of the TVOCs. VOCs emission of two treatments during sewage sludge composting have the maximum concentration of oxygen-containing organic plant-based VOCs. The maximum ozone generation potential of TVOCs produced by T1 is higher than that of T2, while the maximum ozone generation potential of TVOCs emitted by T1 is lower than that of T2, in the process from produce to emission, the TVOCs maximum ozone generating potential of T1 and T2 were reduced by 99.2% and 96.1%, respectively. In order to control the secondary pollution to the environment caused by the emission of VOCs during the sludge composting, the ventilation mode of T1 is recommended.Keywords
Sewage Sludge, Composting, Ventilation Mode, VOCs, Ozone Generation.Full Text
References
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