摘要
针对污染物浓度较高的猪场沼液,开展了不同浸润线高度下垂直潜流湿地处理效果的对比研究。试验结果表明:湿地浸润线可改变湿地填料层中的溶解氧分布和水力流态,从而造成了3种类型湿地系统对猪场沼液处理效果的差异;在不同水力负荷下,中浸润线垂直潜流湿地(VSSF-M)对猪场沼液中各项污染物的去除效果均好于低浸润线垂直潜流湿地(VSSF-L)和高浸润线垂直潜流湿地(VSSF-H);中浸润线垂直潜流湿地利用溶解氧梯度在填料层内实现了好氧区、缺氧区和厌氧区的共存,从而使硝化作用与反硝化作用在同一系统内完成,提高了系统的脱氮能力;中浸润线垂直潜流湿地系统还可适当增大系统的水力停留时间(HRT),并可优化水力流态,从而进一步改善湿地系统的净化效果。因此,结合处理效果和出水水质的稳定性,中浸润线垂直潜流湿地对浓度较高的猪场沼液具有较高的去除效率。
Comparison study of three vertical subsurface flow constructed wetlands with different water level to treat digested swine wastewa- ter was carried out under different hydraulic loading rate（HLR）. The results showed that, vertical subsurface flow constructed wetland with high water leve（lVSSF-H）, vertical subsurface flow constructed wetland with middle water leve（lVSSF-M）and vertical subsurface flow constructed wetland with low water leve（lVSSF-L）were highly effective in removing SS under three different HLR, whereas their removal rates of COD, NH 4＋ -N, TN and TP decreased with increasing HLR, respectively; VSSF -M had the best effect on treating digested swine wastewater under three different HLR, especially NH4＋ -H and TN, as HLR was 0.02 m·3m-·2d-1, average removal efficiencies of VSSF-M were as follows：83.59% for SS, 90.94% for COD, 87.39% for NH4＋ -N, 82.68% for TN, 95.42% for TP, respectively. It was indicated that there was significant differences among VSSF-H, VSSF-M and VSSF-L due to their different distribution of dissolved oxygen and hydraulic flow state caused by water level; VSSF-M could make aerobic zone, anoxic zone and anaerobic zone coexist in the system in order to improve nitrogen removal rate by nitrification and denitrification; in addition, wastewater treatment effect of VSSF-M could be strengthened because VSSF-M could prolong the hydraulic retention time and optimize hydraulic flow state. Accordingly, VSSF-M was more effective in treating livestock wastewater with high concentration of pollutant due to its high efficiency and stability.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第9期1823-1828,共6页
Journal of Agro-Environment Science
基金
福建省区域重大科技项目(2010N3004)
厦门市科技计划项目(3502Z20112018)
福建省星火计划重点项目(2011S0011)
福建省科技计划重点项目(2012Y0068)
关键词
猪场沼液
浸润线
垂直潜流湿地
处理效果
digested swine wastewater； water level； vertical subsurface flow constructed wetland（VSSF）； treatment effect
