标题:
生活垃圾焚烧厂渗滤液处理工艺的改造研究—以广西某生活垃圾焚烧厂为例Reconstruction of Treatment Process for Leachate from Municipal Solid Waste Incineration Plants—A Case of a Municipal Solid Waste Incineration Plant in Guangxi
作者:
宇鹏
关键字:
渗滤液, 处理工艺, 生活垃圾焚烧厂Leachate, Treatment Process, Municipal Solid Waste Incineration Plant
期刊名称:
《Water pollution and treatment》, Vol.4 No.1, 2015-11-12
摘要:
《生活垃圾焚烧污染控制标准》(GB 18485-2014) (简称新标准)于2014年7月1日开始实施，该新标准对在焚烧厂内对渗滤液进行处理后外排的出水水质要求高于《生活垃圾焚烧污染控制标准》(GB 18485-2001) (简称旧标准)。因此，一些焚烧厂需要对原处理工艺进行改造才能满足新标准的要求。广西某生活垃圾焚烧厂原渗滤液工艺是预处理 + UASB + 两级消化、反硝化 + 外置式MBR + RO，该工艺处理后的出水的SS、重金属浓度高于新标准的限值，但对有机物的去除、脱氮已能满足新标准的要求，为节省投资，尽可能的保留原有的生化处理单元，将调节池改为溢流池，将UASB改为UBF，并增加了均衡池、纳滤单元，改造后的工艺为预处理 + UBF + 两级消化、反硝化 + 外置式MBR + NF + RO。从改造工艺各处理单元对污染物的去除效果看，渗滤液经改造工艺处理后能满足新标准的要求。Standard for pollution control on the municipal solid waste (MSW) incineration (GB 18485-2014) was implemented on July 1, 2014, which was called new standard in this article. However, treat-ment process for leachate existing in some incineration plants was designed according to the re-levant requirement specified in Standard for pollution control on the municipal solid waste (MSW) incineration (GB 18485-2001), which was called old standard in this article. Requirements about effluent quality in new standard were higher than that in old standard. Therefore, some incinera-tion plants need to reconstruct original treatment process to meet the requirements of the new standards. Original treatment process for leachate of a MSW incineration plant in Guangxi included pretreatment, UASB, two-stage digestion and denitrification, external MBR and RO. As far as this original treatment process was concerned, the removal efficiencies of organics and nitrogen could meet criteria specified in new standard, but those of SS and heavy metal could not. When the original process was reconstructed, biochemical treatment unit in original process was retained as much as possible to save investment. The main tasks of reconstruction were to respectively change regulation tank and UASB into overflow tank and UBF and to add equalization tank and NF. So reconstruction process includes pretreatment, UBF, two-stage digestion and denitrification, external MBR, NF and RO. From removal effect of pollutants in various processing units, the effluent quality from reconstruction process can reach the discharge concentration limits of the new standard.