环球体育

生化需氧量是指在有溶解氧的條件下,好氧微生物在分解水中有機物的生物化學氧化過程中所消耗的溶解氧量。同時亦包括如硫化物、亞鐵等還原性無機物質氧化所消耗的氧量,但這部分通常占很小比例。

youjiwuzaiweishengwuzuoyongxiahaoyangfenjiedatishangfenlianggejieduan。diyijieduanchengweihantanwuzhiyanghuajieduan,zhuyaoshihantanyoujiwuyanghuaweieryanghuatanheshui;dierjieduanchengweixiaohuajieduan,zhuyaoshihandanyoujihuahewuzaixiaohuajundezuoyongxiafenjieweiyaxiaosuanyanhexiaosuanyan。ranerzhelianggejieduanbingfeijieranfenkai,ershigeyouzhuci。duishenghuowushuijixingzhiyuqijiejindegongyefeishui,xiaohuajieduandayuezai5yi7ri,shenzhi10riyihoucaixianzhujinxing,gumuqianguoneiwaiguangfancaiyongde20℃wutianpeiyangfa(bod5fa)cedingbodzhiyibanbubaokuoxiaohuajieduan。

bodshifanyingshuitibeiyoujiwuwuranchengdudezonghezhibiao,yeshiyanjiufeishuidekeshenghuajiangjiexingheshenghuachulixiaoguo,yijishenghuachulifeishuigongyishejihedonglixueyanjiuzhongdezhongyaocanshu。

wutianpeiyangfa(20℃)

yechengbiaozhunxishifa。qicedingyuanlishishuiyangjingxishihou,zai20±1℃tiaojianxiapeiyang5tian,qiuchupeiyangqianhoushuiyangzhongrongjieyanghanliang,erzhedechazhiweibod5。ruguoshuiyangwurishenghuaxuyangliangweichaoguo7mg/l,zebubijinxingxishi,kezhijieceding。henduojiaoqingjiedeheshuijiushuyuzheyileishui。

duiyubuhanhuoshaohanweishengwudegongyefeishui,rusuanxingfeishui、jianxingfeishui、gaowenfeishuihuojingguolvhuachulidefeishui,zaicedingbod5shiyingjinxingjiezhong,yiyinrunengjiangjiefeishuizhongyoujiwudeweishengwu。dangfeishuizhongcunzaizhunanbeiyibanshenghuowushuizhongdeweishengwuyizhengchangsudujiangjiedeyoujiwuhuoyoujuduwuzhishi,yingjiangxunhuahoudeweishengwuyinrushuiyangzhongjinxingjiezhong。

1.xishishui

duiyuwurandedimianshuihedaduoshugongyefeishui,yinhanjiaoduodeyoujiwu,xuyaoxishihouzaipeiyangceding,yibaozhengzaipeiyangguochengzhongyouchongzuderongjieyang。qixishichengduyingshipeiyangzhongsuoxiaohaoderongjieyangdayu2mg/l,ershengyurongjieyangzai1mg/lyishang。

xishishuiyibanyongzhengliushuipeizhi,xiantongrujinghuoxingtanxifujishuixichulidekongqi,puqi2—8h,shishuizhongrongjieyangjiejinbaohe,ranhouzaizai20℃xiafangzhishuxiaoshi。linyongqianjiarushaolianglvhuagai、lvhuatie、liusuanmeidengyingyangyanrongyejilinsuanyanhuanchongrongye,hunyunbeiyong。xishishuidephzhiyingwei7.2,bod5yingxiaoyu0.2mg/l。

rushuiyangzhongwuweishengwu,zeyingyuxishishuizhongjiezhongweishengwu,jizaimeishengxishishuizhongjiarushenghuowushuishangcengqingye1-10mlhuobiaocengturangjinchuye20—30ml,huoheshui、hushui10-100ml。zhezhongshuichengweijiezhongxishishui。weijianchaxishishuihejiezhongyedezhiliang,yijihuayanrenyuandecaozuoshuiping,jiangmeishenghanputaotangheguansuange150mgdebiaozhunrongyeyi1:50xishibixishihou,yushuiyangtongbucedingbod5,cedezhiyingzai180—230mg/lzhijian,fouze,yingjianchayuanyin,yuyijiuzheng。

2.shuiyangxishibeishu

水樣稀釋倍數應根據實踐經驗進行估算。該表列出地面水稀釋倍數估算方法。工業廢水的稀釋倍數由CODcr值分別乘以系數0.075、0.15、0.25獲得。通常同時作三個稀釋比的水樣。

3.cedingjieguojisuan

duibujingxishizhijiepeiyangdeshuiyang:

BOD5(mg/L)=C1-C2

shizhong:cl—shuiyangzaipeiyangqianrongjieyangdenongdu(mg/l); c2—shuiyangjing5tianpeiyanghou,shengyurongjieyangnongdu(mg/l)。

duixishihoupeiyangdeshuiyang:

shizhong:b1—yixishishui(huojiezhongxishishui)zaipeiyangqianderongjieyangdenongdu(mg/l); b2——xishishui(huojiezhongxishishui)zaipeiyanghouderongjieyangdenongdu(mg/l); f1——xishishui(huojiezhongxishishui)zaipeiyangyezhongsuozhanbili; f2——shuiyangzaipeiyangyezhongsuozhanbili。

shuiyanghanyoutong、qian、xin、ge、ge、shen、qingdengyouduwuzhishi,duiweishengwuhuoxingyouyizhi,keshiyongjingxunhuaweishengwujiezhongdexishishui,huotigaoxishibeishu,yijianxiaoduwudeyingxiang。ruhanshaolianglv,yibanfangzhi1—2hkezixingxiaoshi;duiyoulilvduanshijianbunengxiaosandeshuiyang,kejiaruyaliusuannachuquzhi,jiaruliangyoushiyanqueding。

benfangfashiyongyucedingbod5dayuhuodengyu2mg/l,zuidabuchaoguo6 000mg/ldeshuiyang;dayu6 000mg/l,huiyinxishidailaigengdawucha。

 

 

 

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