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Research for the Influence of Sewage Sludge on the Plant Soil and Water

Author: ZhouHaiHao
Tutor: YangHaiLong
School: Beijing Forestry University
Course: Soil and Water Conservation and Desertification Combating
Keywords: Raw sludge Compost sludge Heavy metal
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 119
Quote: 1
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Abstract


With the rapid development of industrialization, the contradiction between the rapid growth of the urban population, the increase in the amount of sludge and the current capacity is increasingly intensified, an inevitable requirement for the sludge consumptive capacity building. The relative shortage of natural resources, therefore, the resource utilization of the sludge that much more urgent. Organic matter, N, P, K and other nutritional substances in municipal sludge is very rich, so its resource utilization has become the the current sludge ideal way out. Factors that limit the resource utilization of the sludge pathogenic microorganisms including those containing heavy metals and excess nutrients, more and more scholars began to study to solve difficult ways and means. In this study, the raw sludge and compost sludge and soil mixed design pots species and soil column two experimental systems, and find out the pros and cons of plants, soil and water fit to impose the raw sludge and compost sludge amount to provide a reference for resource utilization of the sludge. Basin kinds of experiments show that: there is a certain dose relationship between sludge amount of plant biomass and root to shoot ratio. - Given the range of tall fescue biomass and root to shoot ratio increased with increasing sludge application rate, but when the sludge application rate over this range, tall fescue biomass and root to shoot ratio, but will reduce the . This shows that excessive application of sewage sludge adverse effect on plant growth and development, and land use should be strict control of dosage. Simulated soil column leaching experiment: Leachate total phosphorus and total nitrogen has significantly increased pH downward trend in the application of sewage sludge. Higher nitrogen content in raw sludge series leachate, and easy to groundwater pollution. Total phosphorus content in the leachate has little effect on the cost of production of agriculture, but there is a huge impact on its eutrophication. Therefore, in order to avoid the enrichment of nitrogen and phosphorus in surface water and groundwater, causing the eutrophication of water bodies, both raw sludge compost sludge volume needs to be controlled in a certain range. After the analysis of heavy metal elements which show that the raw sludge Series leachate for the content of heavy metals in the leachate, the most likely cause potential contamination to groundwater Mn elements, and compost sludge series of leaching solution resulting in potential contamination of groundwater is the most critical The factor As elements. The study basin kinds of tall fescue experimental and simulated soil column leaching experiments, analysis of nutrients and heavy metals in the soil environment, migration and transformation, as well as plants, water, and thus find a suitable raw sludge and compost sludge The applied amount is 10% and 15%, respectively.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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