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堆肥化处理TNT红水污染土壤
丛鑫1, 姜久宁1, 刘寒冰2, 杨兵2, 薛南冬2
1.辽宁工程技术大学环境科学与工程学院;2.中国环境科学研究院
摘要:
二硝基甲苯磺酸钠(2,4-二硝基甲苯-3-磺酸钠和2,4-二硝基甲苯-5-磺酸钠)是TNT红水污染土壤中主要污染物质,为研究堆肥化对土壤中二硝基甲苯磺酸钠的降解效果,本研究采用有机废物堆肥方法,探讨堆肥化对TNT红水污染土壤中二硝基甲苯磺酸钠降解的可行性,以及温度、含水率和pH值变化对降解效果的影响。结果表明,有机废物堆肥能处理TNT红水污染土壤,在堆肥60 d,五个堆肥体系(猪粪+木屑、猪粪+麦壳、污泥+木屑、污泥+麦壳和马粪+木屑)对2,4-二硝基甲苯-3-磺酸钠的降解率为65.5%~88.4%,对2,4-二硝基甲苯-5-磺酸钠的降解率为60.9%~100%。在第4 d堆肥体系所在的高温阶段(29.7~53.6℃),五个堆肥化体系中2,4-二硝基甲苯-3-磺酸钠总量的49.5%~67.3%被降解,高温堆肥有利于有机物的降解。堆体含水率随堆肥时间延长呈下降趋势,在堆肥第8 d,外源补水至体系含水率为50%,(猪粪+麦壳)体系对2,4-二硝基甲苯3-磺酸钠的去除率从70.2%增加至88.4%,即适当的外源补水可提高2,4-二硝基甲苯3-磺酸钠的降解去除率。五个堆肥体系中pH值均呈初期上升、后期下降并趋于稳定的趋势,但整个堆肥过程中,堆体pH始终保持在7.3~8.3之间。研究显示,五个堆肥体系中(猪粪+麦壳)体系效率对2,4-二硝基甲苯-3-磺酸钠和2,4-二硝基甲苯-5-磺酸钠的降解效率最高,分别为88.4%和100%。
关键词:  堆肥  TNT红水  土壤  二硝基甲苯磺酸钠
DOI:
分类号:
基金项目:
Composting for soils contaminated by TNT red water
Cong Xin,Jiang Jiuning,Liu Hanbing,Yang Bing,Xue Nandong,et al
College of Environmental Science and Engineering,Liaoning Technical University
Abstract:
Dinitrotoluene sulfonates (2,4-dinitrotoluene-3-sulfonate and 2,4-dinitrotoluene-5-sulfonate) are the main pollutants of soils contaminated by TNT red water of explosive factory. The present study assessed the effectiveness of composting with organic waste on the degradation of dinitrotoluene sulfonates, as well as the effects of the changes in moisture, temperature and pH during the composting process. The obtained results revealed that the degradation rates in five composting systems (pig manure + sawdust, pig manure + rice chaff, sewage sludge + sawdust, sewage sludge + rice chaff, and horse manure + sawdust) were 65.5% ~ 88.4% for 2,4-dinitrotoluene-3-sulfonate and 60.9% ~ 100% for 2,4-dinitrotoluene-5-sulfonate during the 60-day composting. More than 49.5% of dinitrotoluene sulfonates were degraded in the thermophilic period (29.7~53.6℃) in the fourth day. The moisture contents of five composting systems were declined during the composting process, and the supplementary water to 50% in the eighteenth day had an increase of from 70.2% to 88.4% in the degradation rate of 2,4-dinitrotoluene-3-sulfonate (pig manure +rice chaff). pH of the five composting systems increased initially, decreased subsequently, and stabilized finally. The results showed that organic waste composting can treat the polluted soil by TNT red water. The pig manure + sawdust system had the highest degradation rate in the studied five composting system, which represented the degradation rate of 88.4% and 100% for 2,4-dinitrotoluene-3-sulfonate and 2,4-dinitrotoluene-5-sulfonate, respectively.
Key words:  composting  TNT red water  soil  dinitrotoluene sulfonates