蚯蚓培养床系统对污泥的处理及其产物的初步利用

发布时间：2018-03-15 01:29

本文选题：污泥　切入点：培养床　出处：《西南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着城镇污水处理量日益增加,作为污水处理伴生产物的污泥量亦愈来愈大。已有研究表明,污泥不合理处理处置会对地表水、大气、土壤等造成严重污染。近年来,大量研究人员致力于污水处理技术的研发。本研究利用蚯蚓具有食腐性的特征处理污泥,探究“蚯蚓培养床处理污泥+处理后产物农用”的污泥处理处置方式,旨在实现污泥的绿色资源化。论文取得的主要研究成果如下:为了获得较高的蚯蚓增殖量和较好的含污泥基质处理速率,优化蚯蚓培养床条件参数如下:污泥中添加秸秆(混合质量比9:1);单次含污泥基质添加量为400g,每12天添加一次;培养床基质构成为1 0 c m底层土壤+5 c m缓冲基质+含污泥基质;以灰色土壤作底层土壤。通过观察发现,蚯蚓活动能明显改变含污泥基质外观,将大块的污泥分解成为以蚯蚓粪为主的细碎状物质。且研究显示,在培养床中接种蚯蚓能明显提高培养床对含污泥基质中TN、TP、OM的去除率和对含污泥基质中细菌的灭活率。蚯蚓活动可改变培养床各层基质TN、TP的分布状况。培养起始时,培养床各层基质中TN、TP分布相对均匀,至培养结束时,接种蚯蚓的培养床含污泥基质层和缓冲基质层中的TN、TP值较初始值降低,而底层土壤层的TN、TP值较初始值增加。使用添加蚯蚓粪的土壤作为种植基质,可促进青椒幼苗和凤仙花幼苗的生长,且土壤中混合蚯蚓粪的比例越高幼苗生长状况越好。较种植到一般土壤中的青菜种子,使用添加新鲜脱水污泥的土壤作为种植基质,会使青菜种子最终发芽率降低32.5%;使用添加蚯蚓粪的土壤作为种植基质,在研究进行的各个时间段内均能促进青菜种子的发芽,使其最终发芽率提高10.9%。
[Abstract]:With the increasing amount of sewage treatment in cities and towns, the amount of sludge which is associated with sewage treatment is becoming larger and larger. Some studies have shown that the unreasonable treatment of sludge will cause serious pollution to surface water, atmosphere, soil, etc. In recent years, A large number of researchers have devoted themselves to the research and development of sewage treatment technology. In this study, the characteristics of earthworms with scavenging property were used to treat sludge, and to explore the sludge treatment and disposal mode of "earthworm culture bed after sludge treatment after sludge treatment for agriculture". The main results of this paper are as follows: in order to obtain higher earthworm proliferation and better sludge substrate treatment rate, The optimized conditions of earthworm culture bed are as follows: adding straw (mixed mass ratio 9: 1), adding 400 g of sludge substrate once every 12 days; The substrate composition of culture bed was 10 cm bottom soil, 5 cm buffer substrate containing sludge, and gray soil as bottom soil. It was found that earthworm activity could obviously change the appearance of sludge containing substrate. Decompose a large chunk of sludge into a fine fragment of material dominated by earthworm dung. And studies have shown that, Inoculation of earthworms in the culture bed could obviously increase the removal rate of TNTTPOM and the inactivation rate of bacteria in the sludge containing substrate. Earthworm activity could change the distribution of TNTTP in each layer of the culture bed, and at the beginning of culture, the activity of earthworm could change the distribution of TNTTP in each layer of culture bed. The distribution of TNTP in each layer of the culture bed was relatively uniform. At the end of culture, the TNTP values in the substrates containing sludge and in the buffer substrates of earthworm inoculated in the culture bed were lower than the initial values. However, the TNN TP value of the bottom soil layer was higher than the initial value. Using the soil supplemented with earthworm dung as the planting substrate could promote the growth of green pepper seedlings and Impatiens chinensis seedlings. The higher the proportion of earthworm dung in the soil, the better the seedling growth condition. Compared with the vegetable seeds planted in the general soil, the soil supplemented with fresh dewatered sludge was used as the planting substrate. The soil supplemented with earthworm dung could promote the germination of green vegetable seeds and increase the final germination rate by 10.9%.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;X174

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