无锡市典型污泥处理处置全过程碳排放特征研究

Carbon emission characteristics of typical sludge treatment and disposal process in Wuxi

无锡市污泥处理处置工程实行碳减排策略迫在眉睫,对无锡市3种主要的污泥处理处置技术路线进行全过程碳排放核算。核算结果表明,当处理1 t干污泥时,深度脱水-干化焚烧-填埋的碳排放量(2 985.34 kgCO_(2)/tDS)最高,其次是生物沥浸-好氧堆肥-土地利用(2 743.06 kgCO_(2)/tDS),碱性热水解-土地利用的总碳排放量最低,为1 080.64 kgCO_(2)/tDS。整体上,污泥碳排放中以电能消耗和药剂消耗为主的间接碳排放占全部碳排放量的82.4%,是污泥处理处置过程产生碳排放的主要因素。

It is imminent to implement carbon emission reduction strategies for sludge treatment and disposal projects in Wuxi. Carbon emission calculation of three main sludge treatment and disposal methods in Wuxi is carried out. The accounting results show that when 1 ton of dry sludge is treated, the carbon emission(2 985.34 kgCO_(2)/tDS) of the "deep dewatering-drying-incineration-landfill" method is the highest, followed by the "bioleaching-aerobic composting-land use” method(2 743.06 kgCO_(2)/tDS), and “alkaline thermal hydrolysis-land use” presents the lowest(1 080.64 kgCO_(2)/tDS). On the whole, the indirect carbon emissions, mainly electricity consumption and chemical consumption, accounted for 82.4% of the total carbon emissions, which is the principal factor for the carbon emissions in the sludge treatment and disposal process.