排序方式: 共有15条查询结果,搜索用时 15 毫秒
1.
2.
生活垃圾的卫生填埋处理是目前我国生活垃圾处理的主要方法,而垃圾填埋产生的渗滤液是污染环境的重要隐患。对垃圾渗滤液的主要来源及水量的影响因素、主要特点进行了综述,并就如何控制处理和管理好垃圾渗滤液提出了对策措施。 相似文献
3.
Vertical and temporal distributions of N and P in soil solution in aquatic-terrestrial ecotone (ATE) of Taihu Lake were investigated, and the relations among N, P, ORP (oxidation reduction potential), TOC, root system biomass and microorganism were studied. As a whole, significant declines in TN, NO3^--N, DON (dissolved organic nitrogen) and TP concentration in soil solution have occurred with increase of the depth, and reached their minima at 60 cm depth, except for NH4^+-N, which increased with depth. The concentration of TP increased gradually from spring to winter in the topsoil, the maximum 0.08 mg/L presented in the winter while the minimum 0.03 mg/L in spring. In the deeper layer, the concentration value of TP fluctuated little. As for the NO3^--N, its seasonal variation was significant at 20 cm depth, its concentration increased gradually from spring to autumn, and decreased markedly in winter. Vertical and temporal distribution of DON is contrary to that of NO3^--N. The results also show that the variation of N and P in the percolate between adjacent layers is obviously different. The vertical variation ofTN, TP, NO3^--N, NH4^+-N and DON is significant, of which the variation coefficient of NO3^--N along the depth reaches 100.23%, the highest; while the variation coefficient of DON is 41.14%, the smallest. The results of correlation analysis show that the concentration of nitrogen and phosphorus correlate significantly with TOC, ORP, root biomass and counts of nitrifying bacteria. Most nutrients altered much from 20 to 40 cm along the depth. However, DON changed more between 60 and 80 cm. Results show that soil of 0-60 cm depth is active rhizoplane, with strong capability to remove the nitrogen and phosphorus in ATE. It may suggest that there exists the optimum ecological efficiency in the depth of above 60 cm in reed wetland. This will be very significant for ecological restoration and reestablishment. 相似文献
4.
Brian K. Richards Brendan M. Schulte Arik Heilig Tammo S. Steenhuis Murray B. McBride Ellen Z. Harrison Philip Dickson 《Journal of the American Water Resources Association》2004,40(4):1025-1042
ABSTRACT: Farms that once spread only manures are now also applying sewage biosolids (sludge) and/or other wastes such as those from food processing. The objective of this study was to monitor environmental impacts at a dairy farm applying these materials. Fields were selected representing recent waste applications of manure (M1, M2), sewage biosolids (B1, B2), or fertilizer only control (F1, F2), although most fields had historical biosolids applications. Fields representing each treatment were not experimental replicates because of varying applications and soil characteristics. Septage and food processing wastes were also applied. Soil percolates were collected with wick lysimeters. Runoff was sampled at seven stream sites. Test field soils and alfalfa (Medicago sativa) were analyzed for trace elements. Cumulative trace metal loadings were low, at most only 1 percent of USEPA Part 503 limits. Surface soil enrichment was most evident for Mo, P, and S. Alfalfa tissue showed no trends of concern. The B2 site had the greatest percolate concentrations for 6 of 13 elements. Percolate Cu was somewhat elevated at Sites M1, M2, B2, and Fl. Percolate sodium was elevated on all M and B fields and sulfur was greatest at M2, B1, and B2. Soluble orthophosphate correlated with stream discharge during intensive monitoring of Stream Sites S1 (fertilizer) and S2 (biosolids). Peaks in S2 streamwater Mo lagged large runoff events by five days. Total streamwater export of Cu, Na, Mo, and soluble P were greater from the S2 biosolids subwatershed than from the S1 fertilizer subwatershed. Percolate concentrations exceeded corresponding streamwater concentrations in most cases. 相似文献
5.
6.
阐述垃圾渗滤液的产生及危害,重点介绍现有垃圾渗滤液中高浓度NH3-N处理的现状及发展方向.垃圾填埋场渗滤液是一种成分复杂的废水,目前还没有特别有效的治理办法,传统的生化处理办法虽然常常用来处理渗滤液,但是由于渗滤液中含有高浓度NH3-N,其处理效果不及城市污水的处理. 相似文献
7.
8.
随着人口的增长和城市化的迅速发展,城市生活垃圾产量逐年递增,成分更加复杂.城市生活垃圾填埋过程中产生的渗滤液和焚烧过程产生的烟气对环境的污染极为严重,一定程度上已经制约了城市的可持续发展.通过分析渗滤液的产生及对环境的污染,提出了分层填埋控制和渗透反应栅格修复技术.对焚烧过程中的污染,通过焚烧前分类处理从源头上减少二次污染,同时对焚烧产生的烟尘和有毒有害物质进行物理化学方法的去除. 相似文献
9.
10.