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Research on Experiment and Evaluation of Sewage Sludge Used as Cover Material in MSW Landfill

Author: WangJing
Tutor: XueQiang；LuHaiJun
School: Wuhan Polytechnic University
Course: Applied Chemistry
Keywords: Sludge Modifier Microscopic characteristics Mechanical properties Performance Evaluation
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 96
Quote: 0
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Abstract


Large urban ensemble sewage water sludge disposal requirements of ecological safety, environmental science, chemical engineering and geotechnical engineering interdisciplinary theories and methods of municipal the comprehensive sewage water sludge as the research object, through a series of sludge materialized characteristics and geotechnical engineering properties of the pilot study, to carry out the modified sludge as the garbage landfill closure cover material effectiveness and feasibility studies, to provide decision support for ecological safe disposal of sludge. First studied the chemical characteristics of the sludge and microscopic characteristics and sludge eroded changes similar components of the sludge and clay, instead of clay for garbage landfill closure cover, HAS rapid hardening cement, lime, three change sexual agent for sludge modified, and the modified sludge moisture content, organic matter, bulk density, calorific value and chemical properties were monitored at the same time, the mechanical properties of the sludge, the microscopic characteristics are also appropriate monitoring. The key findings are as follows: (1) through the sludge microscopic characteristics analysis sludge composition similar to clay, sludge thermogravimetric characteristics is divided into three stages, the analysis of water out of phase, out of phase volatiles, fixed carbon combustion stage; loose body the sludge shape are irregular, the loose porous surface, the hole is filled with fine grain, and adheres to many floc forming an amorphous structure. Erosion characteristics through the sludge: sludge began to be eroded, small shear strength, mobility, landslide-prone phenomenon. Late due to the flocculation of colloidal particles, the particles are stabilized. (2) analysis showed that the modified sludge physical and chemical properties: the modified sludge bulk density did not change significantly reduce the the modified sludge calorific value than those of the original sludge, a variety of modified material in the sludge organic matter content can reach sewage mud seal Coverage Requirements. The optimization analysis moisture content: rapid hardening cement content cured 14d ≥ 10% moisture content to meet landfill requirements. The shear experiment results show that only in HAS rapid hardening cement, lime dosage of ≥ 15%, to meet the safety factor requirements and rapid hardening cement safety factor. (3) Analysis of microscopic characteristics of modified sludge: sludge modified internal presence of a large number of communicating pores and high specific surface area of ??pores, and thus can maintain good filtration adsorption properties, i.e., the modified sludge having a strong filter performance and adsorption of heavy metal performance, and thus better able to prevent the landfill landslides and heavy metals into the water. As the modifier to join a specific surface area gradually increases, wherein quicklime relatively large specific surface area, the sludge modified within the content is 10%, the average pore diameter and total pore volume reaches a maximum. Porosity analysis has modified sludge porosity, rapid hardening cement, followed by lime minimum. (4) the modified sludge closure cover material performance evaluation analysis: the concentration of the original sludge of heavy metals in addition to Cd exceeded, sludge leaching of toxic heavy metals and of modified sludge leaching of toxic heavy metals were not exceeded, sludge is used The closure of the landfill cover, will not affect the post-closure landfill farm. The cultured plant heavy metal sludge and clay are part of the heavy metal content is greater than under natural conditions. Bermudagrass accumulated strong enrichment of Cu, white clover strong enrichment effect on Cd, Ni, Fe, tall fescue on Cd, Fe there is a certain amount of accumulated enrichment. Due to the high content of heavy metals in the sludge, the enrichment of plants better repair of heavy metals in the sludge. Modified sludge the leaching toxicity COD comply with the performance of the closure cover material. Lime as a modifier leaching solution when the pH value is higher, does not meet the requirements, HAS, rapid hardening cement is used as the modifier to meet the requirements of the covering material. The results of the above study for sludge utilization and disposal of sludge to provide a theoretical basis and technical parameters, as well as sludge closure covering the performance evaluation provided technical support to provide new ideas, clay, natural source of soil, an important guiding significance and application value.

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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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