Stabilization lagoons are economic systems that are built for treatment of municipal, industrial and agricultural wastewater;these systems are used in rural communities. Objective of this article is to present the hyd...Stabilization lagoons are economic systems that are built for treatment of municipal, industrial and agricultural wastewater;these systems are used in rural communities. Objective of this article is to present the hydrodynamics flow in lagoon system considering 6 screens with 7 channels containing curved forms with slopes suitable to stabilize the flow along each channel, and approach a piston flow. Hydrodynamics of this system with IBER software was analyzed, where was considered the velocity and hydraulic gradient, using Froude number. Also transport of total suspended solids was modelled. Efficiency in the treatment with this design was evaluated, using parameters such as, pH, conductivity, alkalinity, hardness, total solids, dissolved oxygen, redox potential and Chemical Oxygen Demand (COD). Through the results, a homogeneous transport was observed, mainly dissolved oxygen which was concordant with redox potential and COD, also through the curves, short circuits were minimized, avoiding dead zones and making treatment more efficient, finally were possible to comply with regulations of Mexico NOM-001-SEMARNAT-1996 of discharges and the NOM-003-SEMARNAT-1997 for water of agricultural use.展开更多
【目的】筛选对甜瓜枯萎病菌有较强拮抗活性的菌株,并对拮抗菌株进行分类鉴定,为丰富热带地区甜瓜枯萎病生防菌资源库及田间应用提供参考。【方法】以前期筛选获得的82株菌株为试验材料,通过平板对峙、继代培养、发芽率及盆栽试验筛选...【目的】筛选对甜瓜枯萎病菌有较强拮抗活性的菌株,并对拮抗菌株进行分类鉴定,为丰富热带地区甜瓜枯萎病生防菌资源库及田间应用提供参考。【方法】以前期筛选获得的82株菌株为试验材料,通过平板对峙、继代培养、发芽率及盆栽试验筛选出对甜瓜枯萎病菌有较强拮抗活性的菌株,并通过形态特征、生理生化特征及16S r DNA序列分析对筛选获得的菌株进行分类鉴定。【结果】筛选出一株对甜瓜枯萎病菌有较强拮抗活性的放线菌菌株D2,其对枯萎病的防治效果达73.53%。D2菌株可形成气生菌丝和孢子丝,孢子丝呈螺旋形,孢子卵呈圆形,且与利迪链霉菌(Streptomyces lydicus)聚于同一分支中,其同源性达99.6%;综合D2菌株的形态特征及生理生化特性,可鉴定其为利迪链霉菌(S.lydicus)。【结论】D2菌株对甜瓜枯萎病有较好的防治效果,具有开发成生物农药或生物肥料的潜力。展开更多
文摘Stabilization lagoons are economic systems that are built for treatment of municipal, industrial and agricultural wastewater;these systems are used in rural communities. Objective of this article is to present the hydrodynamics flow in lagoon system considering 6 screens with 7 channels containing curved forms with slopes suitable to stabilize the flow along each channel, and approach a piston flow. Hydrodynamics of this system with IBER software was analyzed, where was considered the velocity and hydraulic gradient, using Froude number. Also transport of total suspended solids was modelled. Efficiency in the treatment with this design was evaluated, using parameters such as, pH, conductivity, alkalinity, hardness, total solids, dissolved oxygen, redox potential and Chemical Oxygen Demand (COD). Through the results, a homogeneous transport was observed, mainly dissolved oxygen which was concordant with redox potential and COD, also through the curves, short circuits were minimized, avoiding dead zones and making treatment more efficient, finally were possible to comply with regulations of Mexico NOM-001-SEMARNAT-1996 of discharges and the NOM-003-SEMARNAT-1997 for water of agricultural use.
文摘【目的】筛选对甜瓜枯萎病菌有较强拮抗活性的菌株,并对拮抗菌株进行分类鉴定,为丰富热带地区甜瓜枯萎病生防菌资源库及田间应用提供参考。【方法】以前期筛选获得的82株菌株为试验材料,通过平板对峙、继代培养、发芽率及盆栽试验筛选出对甜瓜枯萎病菌有较强拮抗活性的菌株,并通过形态特征、生理生化特征及16S r DNA序列分析对筛选获得的菌株进行分类鉴定。【结果】筛选出一株对甜瓜枯萎病菌有较强拮抗活性的放线菌菌株D2,其对枯萎病的防治效果达73.53%。D2菌株可形成气生菌丝和孢子丝,孢子丝呈螺旋形,孢子卵呈圆形,且与利迪链霉菌(Streptomyces lydicus)聚于同一分支中,其同源性达99.6%;综合D2菌株的形态特征及生理生化特性,可鉴定其为利迪链霉菌(S.lydicus)。【结论】D2菌株对甜瓜枯萎病有较好的防治效果,具有开发成生物农药或生物肥料的潜力。
