Characterization of primary and secondary wastewater treatment sludge from a pulp and board mill complex to evaluate the feasibility of utilization as a soil amendment agent and a fertilizer product  

作　　者：Risto Pöykiö Gary Watkins Olli Dahl 

机构地区：[1]Department of Environmental Protection,City of Kemi,Valtakatu 26,FI-94100 Kemi,Finland [2]Environmental and Chemical Engineering Research Unit,Faculty of Technology,University of Oulu,Faculty of Technology,FI-90014 University of Oulu,Finland [3]Clean Technology Research Group,Department of Bioproducts and Biosystems,School of Chemical Technology,Aalto University,Espoo 00076 Aalto,Finland

出　　处：《Journal of Bioresources and Bioproducts》2018年第3期88-95,共8页生物质资源与工程（英文）

摘　　要：In this study,we have determined the main important physical and chemical properties as well as the heavy metal concentrations of the primary and secondary wastewater treatment sludge from a pulp and board mill complex located in Finland in order to evaluate the utilization of these by-products as a soil amendment agent or a fertilizer product.Easily soluble Ca,Mg,K,Na,P and S concentrations in the sludges were extracted by ammonium acetate(CH3COONH4)and easily soluble Cu,Mn and Zn concentrations by CH3COONH4+Na2EDTA.For the determination of total nutrient and total heavy metal concentrations in sludges,they were digested using aqua regia(3 mL HCl+9 mL HNO3).The total heavy concentrations in the primary sludge were lower than the Finnish heavy metal limit values for fertilizer products.In the secondary sludge,all other total heavy metals than the total Cd concentration(4.8 mg/kg;d.w.)were lower than the heavy metal limit values for fertilizer products.Due to the low total heavy metal concentrations,which were lower than the Finnish limit values for fertilizer products,the primary sludge is a potential fertilizer.Although the total Cd concentration(4.8 mg/kg;d.w.)in the secondary sludge exceed the limit value of 1.5 mg/kg(d.w.)for fertilizer products,this residue may be used as a soil improver,a growing media or as a fertilizer product in landfill sites or in other closed industrial areas,because the Finnish limit values for fertilizer products are not applied at these sites.

关 键 词：Activated sludge FERTILIZER Forest industry Biosludge Board mill Fibre sludge Pulp mill Waste Wastewater treatment 

分 类 号：X70[环境科学与工程—环境工程]