Kev kho dej yog ib feem tseem ceeb ntawm peb lub neej txhua hnub. Lawv tshem tawm cov kab mob phem los ntawm cov dej uas peb siv rau haus, ua noj, thiab ntxuav. Tab sis ua li cas cov tshuab no ua haujlwm tiag tiag? Hauv tsab xov xwm no, peb yuav ua tib zoo saib cov kauj ruam sib txawv hauv cov txheej txheem kho dej.
1. Coagulation thiab Flocculation
Thawj kauj ruam hauv kev kho dej yog coagulation thiab flocculation. Thaum lub sij hawm no, cov tshuaj ntxiv rau hauv dej los pab coagulate (pawg ua ke) txhua yam uas tau ntab ncig. Cov txheej txheem no yog ua raws li los ntawm flocculation, thaum lub sij hawm lub clumps ntawm hais (tseem hu ua floc) yog maj mam stirred los txhawb kom lawv mus ua ke rau hauv loj, hnyav hais.
2. Kev qaug dab peg
Thaum cov khoom tau tsim rau hauv pawg loj, lawv tau sib cais los ntawm cov dej los ntawm cov txheej txheem hu ua sedimentation. Nyob rau theem no, cov dej tso cai zaum tseem tso cai rau cov hnyav floc mus rau hauv qab, tsim ib txheej ntawm sediment.
3. Lim
Cov kauj ruam tom ntej hauv cov txheej txheem yog filtration. Thaum lub sijhawm no, cov dej tau dhau los ntawm cov lim dej kom tshem tawm cov impurities seem. Cov lim dej no tuaj yeem tsim los ntawm ntau yam khoom siv, xws li xuab zeb, gravel, lossis cov pa roj carbon activated.
4. Kev tua kab mob
Tom qab kev lim dej, cov dej yog tshuaj tua kab mob kom tua tau cov kab mob phem, kab mob, thiab kab mob cab uas tuaj yeem tshwm sim. Cov tshuaj tua kab mob uas siv ntau tshaj plaws yog chlorine, uas yog ntxiv rau me me rau hauv dej. Lwm cov tshuaj tua kab mob, xws li ozone, lub teeb ultraviolet, thiab hydrogen peroxide, kuj tseem siv tau.
5. Fluoridation (yeem)
Thaum kawg, qee qhov kev kho dej yuav ntxiv cov tshuaj fluoride rau hauv dej los pab txhim kho kev kho hniav. Fluoride yog ib qho ntxhia uas tshwm sim uas tuaj yeem pab tiv thaiv cov hniav lwj thaum ntxiv rau cov dej haus me me.
Thaum cov dej tau dhau los ntawm tag nrho cov kauj ruam no, nws pom tau tias muaj kev nyab xeeb rau tib neeg noj thiab siv. Txawm hais tias cov txheej txheem tseeb yuav txawv me ntsis nyob ntawm qhov chaw thiab hom kev kho dej, cov kauj ruam yooj yim no tau ua raws los xyuas kom meej tias cov dej uas peb siv yog huv thiab nyab xeeb.
