深圳市光明新区茅洲河底泥厂全流程除臭工程实践

Practice of Plant-wide Deodorization System in Maozhou River Sediment Treatment Plant in Guangming District,Shenzhen

深圳市光明新区茅洲河底泥处理工程是全国第一座永久性、全封闭式的底泥处理厂,底泥处理过程的各环节会产生恶臭气体,臭气污染物排放执行《恶臭污染物排放标准》(GB14554—1993)的厂界二级标准。针对该底泥处理厂恶臭气体的来源及组成特征,将底泥处理流程划分为八个臭气区域和主除臭、余土库除臭两套系统。主除臭系统(60000 m^(3)/h)用于收集板框压滤机车间、泥浆周转池、调理池、沉淀池、沉砂池和皮带输送机等处的臭气,采用喷淋洗涤耦合生物除臭工艺;余土库除臭系统(30000 m^(3)/h)收集余土库内大空间的臭气,采用喷淋洗涤除臭工艺。除臭工艺设计参数参照污水处理厂污泥处理工艺取值,主除臭、余土库除臭系统均采用双层填料喷淋塔,液气比为1.67 L/m^(3),停留时间分别为2.08 s和2.16 s。生物除臭塔采用炭质混合填料,停留时间18.7 s,空塔气速385 m/h。封闭工程采用低盖、高盖和隔断三种形式。除臭系统稳定运行后,该项目厂界臭气污染物可满足设计标准。

Maozhou River sediment treatment plant,which locates in Guangming District,Shenzhen,is the first permanent and full-enclosed sediment treatment plant in China.Odorous gas is inevitably produced at all stages of sediment treatment,and the discharge of odor pollutants shall comply with the second level limit at factory boundary specified in Emission Standards for Odor Pollutants(GB 14554-1993).According to the source and composition characteristics of odorous gas from the sediment treatment plant,the treatment process was divided into eight odor zones and two sets of deodorization systems(including the main deodorization system and the residual soil storage deodorization system).The main deodorization system with treatment capacity of 60000 m^(3)/h is for collecting the odors from the plate and frame press filter workshop,sludge circulation tank,conditioning tank,sedimentation tank,grit chamber and belt conveyor and other structures,and its process is spray washing coupled with biological deodorization.The residual soil storage deodorization system with treatment capacity of 30000 m^(3)/h collects the odor from the large space of the entire residual soil storage,and the deodorization process is spray washing.The design parameters of the deodorization process referred to the sludge treatment process of wastewater treatment plant.The two deodorization systems both adopt double-layer packing spray tower,the liquid-air ratio is 1.67 L/m^(3),and their retention times are 2.08 s and 2.16 s,respectively.The biological deodorization tower is packed with carbonaceous mixed packing media,the retention time is 18.7 s,and the retention gas velocity is 385 m/h.The sealing work consists of low cover,high cover and partition.After the deodorization system runs stably,the concentration of odor pollutants at the factory boundary meets the design standard.