Qhov tseeb txhim kho phosphorus tshem tawm emission ntsuas uas tau tshwm sim nyob rau hauv kev ua lag luam tau teev tseg raws li ib qho tseem ceeb qhia ua rau eutrophication ntawm cov dej hauv Suav teb, nrog nruj emission qauv. Muaj ntau txoj hauv kev rau kev tshem tawm phosphorus. Nws tuaj yeem muab faib ua ob hom: kev tshem tawm phosphorus lom thiab tshuaj phosphorus tshem tawm.
Tus nqi ntawm cov tshuaj phosphorus tshem tawm yog tias cov hlau ions tsim los ntawm kev sib cais ntawm cov ntsev ntsev hauv dej tuaj yeem cuam tshuam qhov tsis zoo ntawm cov colloid hauv dej, uas yog qhov tsawg thiab zoo. Txawm li cas los xij, nws tseem yuav tsum tau siv cov tshuaj phosphorus tshem tawm cov neeg ua haujlwm rau coagulation thiab nag lossis daus ntawm cov khoom. Nws kuj tseem tuaj yeem ua rau muaj phosphate los ua hlau phosphate precipitates, ua raws li nag lossis daus rau phosphorus tshem tawm.
Cov hom phosphorus tshem tawm cov neeg ua haujlwm tau muab faib ua tib hom thiab ntau hom raws li qhov sib txawv ntawm cov coagulation efficiency ntawm lawv cov neeg ua hauj lwm thiab cov kev ua tau zoo ntawm cov phosphorus tshem tawm cov neeg ua hauj lwm nyob rau hauv dissolving hlau oxide los yog hydroxide nyob rau hauv dej. Nws muaj cov khoom nplaum thiab tuaj yeem adsorb thiab precipitate phosphates. Tsis tas li ntawd, polyferric sulfate, raws li ib tug siab polymer yaj nyob rau hauv dej, tsim ib tug multinuclear hlau hydroxide nrog hlau ntsev raws li ib tug phosphorus tshem tawm tus neeg sawv cev. Nws hais txog cov hlau raws li cov neeg ua haujlwm sib xyaw ua ke uas polymerize ferric sulfate thiab muaj zog chelate coagulation zog.
Lub ntsiab phosphorus tshem tawm cov neeg sawv cev sawv cev los ntawm ferric chloride thiab ferrous sulfate yog ib yam tshiab ntawm phosphorus tshem tawm cov neeg ua hauj lwm nyob rau hauv lub lag luam, thiab lawv cov hauj lwm zoo yog superior rau lwm hom tshuaj. Cov nyhuv tshem tawm phosphorus ntawm hom phosphorus tshem tawm tus neeg sawv cev no feem ntau yog nyob ntawm qhov adsorption ntawm aluminium hydroxide, thiab qhov hnyav molecular polymeric ferric sulfate muaj qhov cuam tshuam rau kev tshem tawm ntawm insoluble phosphorus hauv dej khib nyiab. Yog li ntawd, nws tsis zoo li hmoov phosphorus tshem tawm cov neeg ua haujlwm hauv phosphorus tshem tawm.