DLT9972006火电厂石灰石石膏湿法脱硫废水水质控制指标

DL/T997—2006I目次前言··································································································································································Ⅱ1范围·····························································································································································12规范性引用文件··········································································································································13术语·····························································································································································14一般规定······················································································································································15水质标准······················································································································································16水样测定······················································································································································2附录A（资料性附录）废水水质分析方法·································································································3DL/T997—2006II前言本标准是根据《国家发展改革委办公厅关于下达2003年行业标准项目补充计划的通知》（发改办工业［2003］873号文）的要求制定的。石灰石-石膏湿法脱硫技术因为具有脱硫效率高的优点，目前在火电厂的应用越来越广，但湿法脱硫在生产过程中会产生一定量的废水，即脱硫废水。脱硫废水中含有许多对环境污染性较强的成分，必须进行处理，否则将对环境产生二次污染。脱硫废水的水质比较特殊，国内现行的相关废水水质标准不能完全适用于脱硫废水，特制定本标准。本标准是以德国废水管理条例中的烟气净化废水水质标准（附录472004年修订版）为基础，结合GB8978《污水综合排放标准》的相关内容进行编制的。本标准由中国电力企业联合会提出。本标准由电力行业环境保护标准化技术委员会归口并解释。本标准起草单位：西安热工研究院有限公司，浙江天地环保工程有限公司。本标准主要起草人：杨宝红、应春华、王正江、刘柏辉、戴豪波、王璟、许臻。DL/T997—20061火电厂石灰石石膏湿法脱硫废水水质控制指标1范围本标准规定了火电厂石灰石石膏湿法烟气脱硫系统产生的废水在处理后应达到的水质控制指标。本标准适用于火电厂石灰石石膏湿法烟气脱硫系统排放出的废水。不适用于其他工业废气净化系统排放的废水。2规范性引用文件下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件，其随后所有的修改单（不包括勘误的内容）或修订版均不适用于本标准，然而，鼓励根据本标准达成协议的各方研究是否可使用这些文件的最新版本。凡是不注日期的引用文件，其最新版本适用于本标准。GB8978污水综合排放标准DL/T938火电厂排水水质分析方法DL/T5196火力发电厂烟气脱硫设计技术规程FederalLawGazetteBGBl.Ip.1108德国废水排放管理条例（TheOrdinanceonRequirementsfortheDischargeofWasteWaterintoWaters）3术语3.1烟气脱硫fluegasdesulfurization（FGD）对锅炉烟气进行净化，降低其中二氧化硫含量的烟气处理工艺。3.2脱硫废水FGDwastewater石灰石-石膏湿法烟气脱硫系统在运行中排出的废水。3.3工艺水processwater运行中加入烟气脱硫系统的水。4一般规定4.1按照DL/T5196的规定，在有脱硫废水产生的火电厂，应单独设置脱硫废水处理系统。4.2未经处理的脱硫废水不应排入厂区公用排水系统，也不应采用稀释的方法降低污染物浓度后排放，更不应直接外排。4.3对于有脱硫废水产生的火电厂，在厂区废水排放口增加硫酸盐浓度的监测。4.4在脱硫废水处理系统出口，应监测控制的项目有总汞、总铬、总镉、总铅、总镍、总锌、总砷、悬浮物、化学需氧量、氟化物、硫化物和pH值。5水质标准5.1在厂区排放口增加的监测项目和控制指标见表1。DL/T997—20062表1在厂区排放口增加的监测项目和污染物最高允许排放浓度序号监测项目单位最高允许排放浓度值1硫酸盐mg/L20005.2在脱硫废水处理系统出口要监测的项目和最高允许排放浓度值见表2。表2脱硫废水处理系统出口的监测项目和污染物最高允许排放浓度序号监测项目单位控制值或最高允许排放浓度值1总汞mg/L0.052总镉mg/L0.13总铬mg/L1.54总砷mg/L0.55总铅mg/L1.06总镍mg/L1.07总锌mg/L2.08悬浮物mg/L709化学需氧量mg/L15010氟化物mg/L3011硫化物mg/L1.012pH6～9注：化学需氧量的数值要扣除随工艺水带入系统的部分6水样测定6.1取样方法6.1.1水样在脱硫废水处理系统出口取样。6.1.2依据FederalLawGazetteBGBl.Ip.1108，样品应在2h内采集完毕并混匀。可连续采样或者间隔采样。间隔采样时，至少等量采集5个样品；最小取样间隔不得小于5min。6.2分析方法6.2.1所有项目的分析宜按照GB8978中规定的方法进行，分析方法参见附录A。6.2.2采集的分析水样应按照DL/T938的要求保存。DL/T997—20063附录A（资料性附录）废水水质分析方法表A.1废水水质分析方法序号污染物测定方法方法来源1总汞冷原子吸收光度法GB/T74682总镉原子吸收分光光度法GB/T74753总铬高锰酸钾氧化—二苯碳酰二肼分光光度法GB/T74664总砷二乙基二硫代氨基甲酸银分光光度法GB/T74855总铅原子吸收分光光度法GB/T74756总镍火焰原子吸收分光光度法GB/T119127总铜原子吸收分光光度法二乙基二硫代氨基甲酸钠分光光度法GB/T7475GB/T74748总锌原子吸收分光光度法双硫腙分光光度法GB/T7475GB/T74729悬浮物重量法GB/T1190110化学耗氧量重铬酸钾法GB/T1191411氟化物离子选择电极法GB/T748412硫化物亚甲基蓝分光光度法GB/T1648913硫酸盐重量法铬酸钡间接原子吸收法a铬酸钡光度法aGB/T11899GB/T13196—a脱硫废水的硫酸盐含量超过了该方法的检测上限，需要将水样稀释后测定