Removal of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans by three coagulants in simulated coagulation processes for drinking water treatment.
Surface water from Guangzhou to which standard polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) were added was treated by coagulation with ferric chloride (FC), polyaluminium chloride (PAC), and aluminium sulfate (AS) at optimum removal dosages for nature organic matter (NOM) to assess the polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) removal efficiencies. PCDD/Fs in suspended particulate matter (SPM) and treated water (TW) after coagulation were analysed. Low residual levels of PCDD/Fs were found in treated water after coagulation: 0.8% for FC, 0.9% for PAC, and 3.1% for AS. The removal efficiency calculated using these results was >99% for FC and PAC and 97-98% for AS. Most PCDD/Fs congeners could be removed by the three coagulation processes; the removal efficiency of FC and PAC was similar, and slightly higher than that of AS. The results also demonstrate that coagulation with FC preferentially removed tetra- and penta-substituted PCDD/Fs from raw water.
Li
Xiaoming
X
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
Peng
Ping'an
P
Zhang
Sukun
S
Man
Ren
R
Sheng
Guoying
G
Fu
Jiamo
J
D000534:Alum Compounds; D000077410:Aluminum Chloride; D017607:Aluminum Compounds; D001572:Benzofurans / Q000302:isolation & purification*; D002681:China; D002712:Chlorides; D000072338:Dibenzofurans, Polychlorinated; D005290:Ferric Compounds; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000302:isolation & purification; D011786:Quality Control; D014877:Water Pollution, Chemical / Q000517:prevention & control*; D014881:Water Supply / Q000032:analysis*
D000534:Alum Compounds; D017607:Aluminum Compounds; D001572:Benzofurans; D002712:Chlorides; D000072338:Dibenzofurans, Polychlorinated; D005290:Ferric Compounds; D000072317:Polychlorinated Dibenzodioxins; C041524:aluminum sulfate; D000077410:Aluminum Chloride; C024555:ferric chloride