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(r>0.99),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(r>0.95),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。
To explore the improvement effect of desertification soil by adding of dewatering sludge from sewage treatment plant as soil amendment and determine the appropriate adding amount of sludge,the soil structure,nutrition index,water retention character were tested under the dewatering sludge doping content of5%,10%,15%,20%,25%,30%,35%.Three kinds of soil which were suitable for farming were chose as control test sample.The results showed that density of soil particles and soil bulk density reduced（r=-0.99,r=-0.89）,while soil porosity increased when the addition of sludge to the desertification soil（r=0.79）.When the sludge adding amount was more than 10%,the improvement effects of soil bulk density and porosity reduced.However,organic matter content,moisture content and water-holding capacity appeared linear growth with mixing amount of sludge（r〉0.99）.The water retention ability of improved desertification soil was better than contrast soil.Amounts of nitrogen and phosphorus were significantly positive linear correlated with the adding amount of sludge.（r〉0.95）.The content of total nitrogen and phosphorus of improved soil were closed to the comparative soil when the sludge amount was 15%—25%,while the content of total potassium was almost no changed.However,the effective potassium content of sludge effectively increased.The best blending amount was 10%—25%the physical and chemical properties of ameliorative desertification soil was closed to contrasted soil and suitable to vegetation growth.
出处
《水土保持学报》
CSCD
北大核心
2017年第1期323-327,共5页
Journal of Soil and Water Conservation
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)
关键词
脱水污泥
沙化土
含水率
土壤改良
dewatering sludge
desertification soil
water content
soil amelioration
