城镇污水厂排水回用于集中供热管网补充水工程应用

Engineering Application of Municipal Wastewater Treatment Plants Effluent Reused for Supplementary Water of District Heating Network

通过调研城市供热经营企业生产需求和类比国内既有相关工程实例,认为满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准的城镇污水处理厂排水经处理后可作为同时满足《工业循环冷却水处理设计规范》(GB/T 50050—2017)、《城市污水再生利用工业用水水质》(GB/T 19923—2005)和《采暖空调系统水质》(GB/T 29044—2012)的城市集中供热管网补充水回用,但水处理工程的选址与规模应与城市集中供热管网建设的具体规划相契合。城市供热经营企业尚需搭建24项水质指标的全面监测技术平台;研发水处理成本与直接购买工业用自来水相比能够形成明显价格优势的新工艺;采用经济适用的缓蚀阻垢杀生剂配方以降低集中供热管网维护费;因地制宜地开展全生命周期经济评价以权衡管材基建费用与缓蚀阻垢杀生剂运营费用的取舍,以谋求我国严寒地区和寒冷地区的冬季供热真正实现节能减排。

Demand for supplementary water from district heating(DH)management enterprises and relevant domestic engineering cases were investigated,and thus it was suggested that the treated drainage of municipal wastewater treatment plant(WWTP),which was satisfied with the first class A criteria of GB 18918-2002,and which met the norms of GB/T 50050-2017,GB/T 19923-2005 and GB/T 29044-2012 simultaneously,could be reused as the supplementary water of DH network.The locations and dimensions of the water treatment projects should correspond to construction programme of the DH network.In order to truly implement energy saving&emission reduction for heating supply in freezing and cold regions in China,DH management enterprises still need monitoring setups for the 24 water quality indices,a new water reuse technology of which processing cost is much lower than the price of tap water for industry use,an application of suitable scale,corrosion and microorganism inhibitors reducing the maintenance expense of the DH network,and a launch of the total life cycle economic assessment for trading off the capital expenditure of pipes against the operating expenses of inhibitors,suiting to the local conditions.