城市污水处理厂污泥对沙漠化土壤的改良效果

发布时间：2018-03-09 11:49

本文选题：脱水污泥　切入点：沙化土　出处：《水土保持学报》2017年01期 　论文类型：期刊论文

【摘要】：为探究城市生活污水处理厂脱水污泥作为土地改良剂对沙漠化土壤的改良效果,确定合适的污泥掺混量,试验以离心脱水污泥与沙漠表层土壤按污泥掺混量为5%,10%,15%,20%,25%,30%,35%充分掺混,以土壤物理指标、营养指标为考察指标,研究不同污泥掺混量对沙土的改良效果,并与3种适于耕作土壤平行对比。试验表明沙土经污泥掺混后,随着污泥掺混量的增大,其土粒密度、土壤容重降低;污泥掺混量与土粒密度和土壤容重呈负相关,相关系数可达-0.99,-0.89,而土壤孔隙度增加,呈正相关(r=0.79),当污泥掺混量大于10%后,污泥掺混量对土壤容重、孔隙度的改良效果减缓;改良沙土中有机物含量、含水率随污泥掺混量增加呈线性增加(r0.99),持水能力与污泥掺混量呈显著正相关(r=0.99)。改良沙土较对比土壤有更强的保水能力;氮、磷元素含量和污泥投加量呈显著正相关(r0.95),污泥掺混量为15%~25%时,改良沙土氮磷含量均接近对比土壤含量,污泥掺混对土壤全钾含量改善不大,但能有效提高土壤有效钾含量。污泥掺混量为10%~25%时,改良沙漠化土壤的理化性质接近对比适宜耕作土壤。
[Abstract]:In order to investigate the improvement effect of dewatered sludge from municipal sewage treatment plant on desertification soil as a land improvement agent and determine the appropriate amount of sludge mixing, the experiment used centrifugal dewatered sludge and desert surface soil to mix the sludge with the surface soil of the desert. Taking soil physical index and nutrition index as the investigation index, the improvement effect of different sludge mixing amount on sandy soil was studied, and it was compared with three kinds of suitable tillage soil. The experiment showed that the sand soil was mixed with sludge, with the increase of sludge mixing amount. The soil particle density and bulk density of soil decreased, the sludge mixing amount was negatively correlated with soil particle density and soil bulk density, and the correlation coefficient could reach -0.99- 0.89, while the soil porosity increased, which was positively correlated with soil bulk density. When the sludge mixing amount was more than 10%, the sludge mixing amount had a positive correlation with soil bulk density. The content of organic matter and moisture content in improved sandy soil increased linearly with the increase of sludge content, and the water holding capacity was significantly positively correlated with sludge content. The improved sandy soil had stronger water retention capacity than that of the control soil, and nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, nitrogen, There was a significant positive correlation between phosphorus content and sludge dosage. When the amount of sludge was 15 ~ 25, the content of nitrogen and phosphorus in improved sandy soil was close to the contrast soil content, but sludge mixing had little effect on soil total potassium content. But it can effectively increase the available potassium content in the soil. When the sludge mixing amount is 10 ~ 25, the physical and chemical properties of the improved desertification soil are close to that of the suitable tillage soil.
【作者单位】：沈阳建筑大学辽河流域水污染防治研究院市政与环境工程学院;
【基金】：沈阳建筑大学学科涵育项目(XKHY2-116);沈阳建筑大学青年基金项目(2015010);沈阳建筑大学博士后基金(SJZUBSH201625) 国家水体污染控制与治理科技重大专项(2014ZX07202-011) 辽宁省教育厅科学研究项目(LJZ2016028)
【分类号】：S156;S141.6

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