新疆风采18选7

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紫外线消毒技术在城镇污水厂中的应用

2019-05-15 22:47:10      点击:
2002年12月24日颁布的《城镇污水处理厂污染物排放标准》中首次将微生物指标列为基本控制指标,要求城市污水必须进行消毒处理,因此消毒作为城市污水厂处理的最后一道工艺至关重要。而在众多的消毒方式中,紫外线消毒具有不需投加任何化学药剂,不改变水的成分和结构,消毒时间短,杀菌范围宽效果好的优点,得到了越来越多设计师和用户的青睐。 

一、紫外线消毒主要特点 

紫外线是一种肉眼不可见的光线,水消毒主要采用的是C波段,尤以波长253.7nm处杀菌效率最高,其主要特点有:①杀菌效率高,传统的消毒方式要达到现代紫外线消毒技术的杀菌效果一般需要20min至1h的时间,而在外线仅需要1s内完成;②紫外消毒技术由于是物理方法,不加入任何化学药剂,不产生二次污染;③杀菌广谱性,可杀灭各种细菌、病菌、寄生虫类;④无持久杀菌能力,不能有效防止细菌、病毒等微生物再次繁殖;⑤紫外线消毒无味、无噪声,并且建设和运行费用较低,运行安全可靠以及安装维修简便,占地面积小,并且可以实现自动控制等特点。 


二、影响紫外线消毒效果的因素 

1. 紫外剂量 紫外剂量是指单位面积上的接收到的紫外线能量,等于紫外光强度与接触时间的乘积。在相同的紫外光强度条件下,接触时间决定紫外剂量。从理论上分析,紫外剂量越大,消毒效果越好,但在实际应用中紫外剂量有一极限值,超过此值后不但不能有效地对额外的微生物进行灭杀,而且还增大了消毒的成本。 


新疆风采18选7 2.XUANFUWU XUANFUWUDUIZIWAIXIANXIAODUDEYINGXIANGZHUYAOBIAOXIANZAI:

新疆风采18选7 ①XUANFUKELIXISHOUBINGFENSANLEZIWAIXIANNENGLIANG;

新疆风采18选7 ②WEISHENGWUYINZANGZAIKELIZHONGSHOUDAOBIHU,XUERUOLEZIWAIXIANDEMIEHUOXIAOGUO。YINXIE,JINRUZIWAIXIANXIAODUXITONGDEWUSHUIXUANFUWUNONGDUYAOYANGEKONGZHI,YIBANTUIJIANXUANFUWUBUYINGGAOYU20mg/L。ERZIWAIXIANXIAODUXITONGQIANDUANCHENDIANHUOGUOLVCHULICHENGDUJIANGJUEDINGXUANFUWUNONGDUDEGAODI,JIANJIEYINGXIANGXIAODUXIAOGUO。 


3. ZIWAIDENGTAOGUANJIEGOU DANGWUSHUILIUJINGZIWAIXIANXIAODUQISHI,QIZHONGYOUXUDUOWUJIZAZHIHUICHENDIANZHANFUZAITAOGUANWAIBISHANG,YOUQIDANGWUSHUIZHONGYOUJIWUHANLIANGJIAOGAOSHIGENGRONGYIXINGCHENGWUGOUMO,ERQIEWEISHENGWURONGYISHENGZHANGXINGCHENGSHENGWUMO,ZHEIXIEDOUHUIYIZHIZIWAIXIANDETOUSHE,YINGXIANGXIAODUXIAOGUO。 


新疆风采18选7 4.GUANGFUHUOZUOYONG WUSHUILIUJINGZIWAIXIANXIAODUQUHOU,SHUIZHONGDEWEISHENGWUJUNYOUYUZIWAIXIANDEZHAOSHESHOUDAOSUNSHANGYIZHISIWANG,DANYIXIEWEISHENGWUSHOUDAOKEJIANGUANGZHAOSHEHOU,ZAITINEIGUANGFUHUOMEIDEZUOYONGXIA,JIANGLIANJIEZAIYIQIDEERJUTIJIEJUXINGCHENGDANTI,CONGERHUIFUQIFUZHINENGLI,ZHEIZHONGXIANXIANGCHENGWEIGUANGFUHUO。ZIWAIXIAODUDEWEISHENGWUFUHUOXIANXIANGZAISHUICHULILINGYUNEIPUBIANCUNZAI,DABUFENZHISHIXINGWEISHENGWU(RUDACHANGGANJUNDENG)DOUJUYOUYIDINGCHENGDUDEFUHUOGONGNENG,YINCIDUIWEISHENGWUGUANGFUHUOXIANXIANGDEKONGZHISHIZIWAIXIAODUXIAOGUODEZHONGYAOBAOZHENGZHIYI。CAIYONGZENGJIAXIAODUJILIANG、CHUSHUIZAIBIGUANGTIAOJIANXIAPAIFANGDENGFANGSHIKEYOUXIAOKONGZHIWEISHENGWUFUHUOXIANXIANG。 


三、工程实例 

1. ZIWAIXIANXIAODUJISHUZAIDALIANSHIMOUCHENGZHENWUSHUICHULICHANGDEYINGYONG DALIANSHIMOUCHENGZHENWUSHUICHULICHANGSHEJIGUIMOWEI6WANm3/d,ZHUTIGONGYICAIYONGCASSGONGYI,XIAODUFANGSHICAIYONGZIWAIXIANXIAODU,SHEJIZIWAIXIAODUQU1ZUO,LIANXUJINSHUI,CHULILIANGWEI2500m3/h,GONGPEIZHI6GEMOKUAI108ZHI320WZIWAIDENG,QIEPEITAOSHEZHIDAOLIUBAN、KUASHUIQUXIANG、KONGYAJI、ZHONGKONGJUJIWUDONGLIZIDONGYANMENDENG。CHUSHUISHUIZHIDADAO《CHENGZHENWUSHUICHULICHANGWURANWUPAIFANGBIAOZHUN》YIJIBBIAOZHUN。 


SHIJIYUNXINGGUOCHENGZHONGDELIULIANGBODONGSHIZIWAIXIAODUXITONGSUNHUAI,YUNXINGBUWENDING,ZHUYAOBIAOXIANZAIYIXIAJIGEFANGMIAN:

新疆风采18选7 ①SHUNSHIZUIDALIULIANGWEI4500m3/h,YIDADAOSHEJILIULIANG2500m3/hDE1.8BEI,YINERCHUXIANLEDENGGUANSHULIANGBUZU,ZIWAIJILIANGBUGOU,DAOZHISHAJUNXIAOGUOBUDABIAO;

②CASSFANYINGCHIBUNENGSHIXIAN24hLIANXUCHUSHUI,MEI1.5hDENGGUANZIDONGGUANBIYICIFANGZHIWUSHUIQINGKUANGXIAGANSHAOSUNHUAI,LAISHUIHOUZHONGXINQIDONG,DENGGUANPINFANQIDONG,YANZHONGYINGXIANGSHIYONGSHOUMINGHUOZONGTIJILIANG;

新疆风采18选7 ③LIULIANGBODONGDA,SHUIWEIKONGZHIZHUANGZHIWUFAZHUNQUEFANYINGSHUIWEI,ZIDONGYANMENDONGZUOPINFAN,SHEBEIMOSUNJIAODA;

④DANGSHUIWEIDIYUSHEDINGSHUIWEISHIHUIDAOZHIDENGGUANGANSHAOERSHITAOGUANSHANGDESHUIFENXUNSUZHENGFA,ERSHUIZHONGDEGAIMEILIZIZAITAOGUANBIAOMIANXINGCHENGLETANSUANYANGOU,CONGERYINGXIANGTAOGUANZIWAIGUANGDETOUGUOLV。 

针对该项目出现的问题,该厂对紫外消毒系统进行改造。新建1座紫外消毒渠,原有渠道作为检修超越渠道使用。新建紫外消毒系统按照最大流量(4500m3/h)进行设计,增加3个紫外消毒模块,灯管数量由原108支增加到162支。污水厂经改造后于2008年正式运行,实践证明改造后的紫外消毒系统运行正常,出水水质稳定达标。 


2.ZIWAIXIANXIAODUJISHUZAIZHUHAISHIMOUCHENGZHENWUSHUICHULICHANGDEYINGYONG ZHUHAISHIMOUCHENGZHENWUSHUICHANGSHEJIGUIMO5.5WANm3/d,ZHUTIGONGYICAIYONGGAILIANGA2/OGONGYI,ERCHENCHIWEIZHOUBIANZHOUCHUFULIUSHICHENDIANCHI。ZIWAIXIAODUSHEBEISHEJICHULILIULIANG2291.7m3/h,FENGZHILIULIANG3000m3/h,GONGPEIZHI120GEN320WDIYAGAOQIANGDENGGUAN,ZIWAIDENGGUANYUSHUILIUFANGXIANGYIZHIPINGXINGPAIFANG,CAIYONGZAIXIANJIXIEJIAHUAXUEQINGXI。XIAODUHOUWEISHUIYAOQIUDACHANGGANJUNXIAOYU10000GE/L。ZIWAIXIANXIAODUXITONGTOURUSHIYONGHOU,XIAODUXIAOGUOJIAOWEILIXIANG,CHUSHUIJIBENDADAOSHEJIYAOQIU。GAIXIAODUXITONGYUNXINGFEIYONGYUEWEI0.0218YUAN/m3(BUHANRENYUANGONGZI),QIZHONGBAOKUODIANHAO0.0140YUAN/m3(DIANJIAWEI0.8YUAN/DU),SHEBEIZHEJIU0.0078YUAN/m3。 


该厂采用的周边周出辐流式沉淀池的良好沉淀效果,去除大部分的SS,是紫外线消毒系统高效率杀菌的前提条件,同时消毒系统的在线机械加化学清洗功能,有效保证系统消毒性能不受结垢的影响。在实际运行中发现紫外线消毒系统的效果好坏与处理流量和水质密切相关,当水量突然增大时,紫外线接触时间变短,需要更强的紫外剂量。因此,紫外剂量通常根据最大峰值流量设计,但由于水力负荷大时,出水水质也较平时差,而水质下降势必使透光率下降,致使杀菌率无法保证。紫外线消毒系统运行状况还与设备环境条件密切相关,该厂紫外线消毒设备露天安装,没有设遮阳棚,受周边建筑的影响通风条件差,夏天多雨季节造成高温高湿环境,导致控制柜周边环境温度湿度超出了设备的要求,镇流器因散热不好而有个别损坏。为了保证系统正常运行,加设遮阳棚,并在系统控制柜内安装空调,以便在夏季极端气候条件下对控制系统环境进行降温除湿处理。 


四、 注意事项 

紫外线消毒新疆风采18选7系统设计时要充分考虑进水水质、水量波动、污水厂工艺特点、设备环境条件及拟定消毒目标等因素。

②QIANDUANCHULIGONGYIDUIXUANFUWUDEYOUXIAOKONGZHISHIZIWAIXIANXIAODUXITONGGAOXIAOLVSHAJUNDEQIANTITIAOJIAN。

③ZIWAIDENGGUANBIAOMIANJIEGOUJIANGJIDADIYINGXIANGDENGGUANCHANSHENGDEZIWAIGUANGSHERUSHUIZHONG,KEYITONGGUODINGQIQINGXIDENGGUANJIAYIJIEJUE。

新疆风采18选7 ④ZIWAIDENGGUANPINFANKAIGUAN,JIANGYANZHONGYINGXIANGSHIYONGSHOUMINGHUOZONGTIJILIANG,MEITIANKAIGUAN4CIYIXIASHUZHENGCHANGCAOZUO。 

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