摘要
【目的】研究通风量对城市污泥堆肥过程中硫素转化和挥发性硫化物释放的影响,为有效控制挥发性含硫恶臭物质,保留污泥堆肥产品中的硫素营养提供理论依据和方法。【方法】城市污泥和调理剂(锯末)以3∶1(湿重)的比例混合后,采用自动好氧堆肥控制装置进行15天的堆肥试验,通过改变鼓风机频率实现不同堆体的通风量调节。设置鼓风机工作频率10、13、16 Hz 3个处理,相应的通风量为2.5、3.0和3.5 L/min。在堆肥的第0、1、2、3、5、7、9、11、13、15天进行堆体内部多点混合采样,进行挥发性硫化物的浓度测定,研究城市污泥不同堆肥阶段硫素的转化特征。【结果】相较于低通风量(10 Hz),高通风量(16 Hz)下H2S的峰值浓度下降了约50%,但其累积释放量增加了45.4%;甲硫醚的累积释放量提高了398%,峰值浓度增加了490.8%;CS2的累积释放量下降了57.8%,其峰值浓度下降了77%。堆肥产品中有效硫浓度在低、中、高通风量条件下相较于堆肥前分别上升了19.5%、19.1%、36.1%。【结论】城市污泥堆肥过程中,提高通风量可以降低H2S的浓度峰值,但增加了H2S的累积释放量,甲硫醚的峰值浓度和累积释放量均显著增加;提高通风量可以抑制城市污泥堆肥过程中CS2的释放。在低、中、高3种通风量条件下,堆肥产品的有效硫浓度相较于堆肥前都明显升高。高通风处理虽然全量硫的损失最大,但更有利于提高堆肥产品中可直接被植物吸收的有效硫含量。
【Objectives】The sulfur transformation and the release of volatile sulfide during sewage sludge composting process were studied under different ventilation conditions.This study was conducted to provide a reference for the retention of higher sulfur content in the compost and the control of malodorous substances.【Methods】A composting experiment was conducted for 15 days in a composting device with automatic ventilating system.The frequency of the blower was set into 10,13,and 16 Hz to achieve low,medium,and strong ventilation treatments,respectively.In all the three ventilation treatments,the sewage sludge and sawdust were mixed in 3∶1(wet weight),and the ventilation was set to an interval of 20 minutes every 1 minute.Multipoint mixed samples were collected,and the emission of volatile sulfides was determined in the beginning and in days 1,2,3,5,7,9,11,13,and 15 of the composting process.【Results】The peak concentration of H2S decreased by about 50%while the cumulative release increased by 45.4%in the strong ventilation treatment.The cumulative release of methyl sulfide increased by 398%,and the peak concentration increased by 490.8%in strong ventilation treatment.In strong ventilation treatment,the cumulative release of CS2 decreased by 57.8%,and the peak concentration decreased by 77%,compared to the low ventilation treatment.The concentrations of available sulfur in the final product increased by 19.5%,19.1%and 36.1%under low,medium,and strong ventilation,respectively,as compared with that before composting.【Conclusions】In the process of composting,strong ventilation intensity reduced the peak concentration of H2S,but increases the cumulative release of H2S.Strong ventilation also promotes the release of methyl sulfide,and increases the peak concentration and cumulative release of methyl sulfide.Thus,it can be concluded that strong ventilation helps to increase the available sulfur content in sewage sludge compost.
作者
刘珺婉
郑国砥
郑海霞
陈同斌
于豹
石晓晓
马闯
LIU Jun-wan;ZHENG Guo-di;ZHENG Hai-xia;CHEN Tong-bin;YU Bao;SHI Xiao-xiao;MA Chuang(Center for Environmental Remediation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China)
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2021年第1期135-143,共9页
Journal of Plant Nutrition and Fertilizers
基金
国家重点研发计划项目(2016YFD0501408)。
关键词
城市污泥
堆肥
通风量
硫
挥发性硫化物
sewage sludge
composting
ventilation
sulfur
volatile sulfur compounds