Zheng Guodi, Liu Yuan, Li Yongjie, Liu Junwan, Yang Junxing
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Bioengineering (Basel). 2022 Jun 17;9(6):258. doi: 10.3390/bioengineering9060258.
Odor released from the sewage sludge composting process often has a negative impact on the sewage sludge treatment facility and becomes a hindrance to promoting compost technology. This study investigated the effect of adding KNO on the emissions of volatile sulfur compounds, such as hydrogen sulfide (HS), dimethyl sulfide (DMS), and carbon disulfide (CS), during sewage sludge composting and on the physicochemical properties of compost products, such as arylsulfatase activity, available sulfur, total sulfur, moisture content, and germination index. The results showed that the addition of KNO could inhibit the emissions of volatile sulfur compounds during composting. KNO can also increase the heating rate and peak temperature of the compost pile and reduce the available sulfur loss. The addition of 4% and 8% KNO had the best effect on HS emissions, and it reduced the emissions of HS during composting by 19.5% and 20.0%, respectively. The addition of 4% KNO had the best effect on DMS and CS emissions, and it reduced the emissions of DMS and CS by 75.8% and 63.0%, respectively. Furthermore, adding 4% KNO had the best effect from the perspective of improving the germination index of the compost.
污水污泥堆肥过程中释放的气味通常会对污水污泥处理设施产生负面影响，并成为推广堆肥技术的障碍。本研究调查了添加硝酸钾（KNO）对污水污泥堆肥过程中挥发性硫化合物（如硫化氢（HS）、二甲基硫醚（DMS）和二硫化碳（CS））排放的影响，以及对堆肥产品理化性质（如芳基硫酸酯酶活性、有效硫、总硫、水分含量和发芽指数）的影响。结果表明，添加KNO可抑制堆肥过程中挥发性硫化合物的排放。KNO还可提高堆肥堆的升温速率和峰值温度，并减少有效硫的损失。添加4%和8%的KNO对HS排放的抑制效果最佳，分别使堆肥过程中HS的排放量降低了19.5%和20.0%。添加4%的KNO对DMS和CS排放的抑制效果最佳，分别使DMS和CS的排放量降低了75.8%和63.0%。此外，从提高堆肥发芽指数的角度来看，添加4%的KNO效果最佳。
