Txhua yam khoom tuaj yeem raug puas tsuaj los ntawm kev siv tas li, tshwj xeeb yog cov khoom siv hluav taws xob. Txawm li cas los xij, cov khoom puas tsis yog pov tseg kiag li thiab tuaj yeem rov ua dua, zoo li yog PCB. Ntxiv mus, nrog kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis, cov khoom siv hluav taws xob tau nce nrawm dua, uas tau ua rau lawv cov kev pab cuam luv. Ntau yam khoom raug pov tseg yam tsis muaj kev puas tsuaj, ua rau muaj pov tseg loj.

Cov khoom lag luam hauv kev lag luam hluav taws xob tau hloov kho sai heev, thiab tus naj npawb ntawm pov tseg PCBS kuj tseem ceeb heev. Txhua xyoo, Tebchaws Askiv muaj ntau dua 50,000 tons ntawm PCBS pov tseg, thaum Taiwan muaj ntau txog 100,000 tons. Kev rov ua dua tshiab yog lub hauv paus ntsiab lus ntawm kev txuag cov peev txheej thiab kev tsim khoom ntsuab. Dhau li, qee yam tshuaj ntawm cov khoom siv hluav taws xob yuav ua rau muaj kev phom sij rau ib puag ncig, yog li kev rov ua dua tshiab yog qhov tsis tseem ceeb.

Cov hlau muaj nyob hauv PCB suav nrog cov hlau sib xws: txhuas, tooj liab, hlau, npib tsib xee, txhuas, tin thiab zinc, thiab lwm yam. Cov hlau zoo nkauj: kub, palladium, platinum, nyiaj, thiab lwm yam. Cov hlau tsis tshua muaj rhodium, selenium thiab lwm yam. PCB kuj muaj cov lej loj ntawm cov polymer ncaj qha lossis tsis ncaj qha hauv cov khoom lag luam roj av, nrog rau qhov muaj txiaj ntsig siab, lawv tuaj yeem siv los tsim lub zog, tab sis kuj tseem tsim cov khoom siv tshuaj muaj feem cuam tshuam, ntau ntawm cov khoom muaj tshuaj lom thiab muaj teeb meem, yog tias pov tseg yuav ua rau muaj kuab paug loj

Cov qauv PCB tau tsim los ntawm ntau lub ntsiab lus uas tuaj yeem rov ua dua tshiab txawm tias lawv siv tsis raug. Yog li, yuav rov ua dua li cas, peb qhia nws cov kauj ruam:

1. Tshem tawm cov lacquer

Lub PCB yog coated nrog cov hlau tiv thaiv, thiab thawj kauj ruam hauv kev rov ua dua tshiab yog tshem cov xim. Cov xim pleev xim muaj cov xim pleev xim organic thiab tshem tawm cov xim alkaline, cov xim pleev xim organic yog tshuaj lom, teeb meem rau tib neeg lub cev thiab ib puag ncig, tuaj yeem siv sodium hydroxide, tiv thaiv kev txhuam thiab lwm yam cua sov.

2. Qhov tawg

Tom qab PCB raug tshem tawm, nws yuav tawg, suav nrog cuam tshuam kev sib tsoo, extrusion crushing thiab shear crushing. Kev siv ntau tshaj plaws yog qhov kub tsis txias txias ua kom khov tshuab, uas tuaj yeem ua kom txias cov khoom tawv thiab zuaj nws tom qab embrittlement, yog li cov hlau thiab cov hlau tsis sib cais kiag li.

3. Kev cais tawm

Cov khoom tom qab tsoo yuav tsum tau sib cais raws li qhov ntom ntom, qhov loj me me, kev sib nqus sib nqus, kev siv hluav taws xob thiab lwm yam ntxwv ntawm nws cov khoom, feem ntau yog qhuav thiab ntub dej sib cais. Kev sib cais qhuav suav nrog kev tshuaj xyuas qhuav, sib cais sib nqus, electrostatic, ntom thiab sib cais tam sim no, thiab lwm yam. Kev sib cais ntub dej muaj kev faib tawm hydrocyclone, flotation, hydraulic shaker, thiab lwm yam. Thiab tom qab ntawd koj tuaj yeem rov siv nws.