Combination of ferric and MIEX for the treatment of a humic rich water.
Seasonal periods of high rainfall have been shown to cause elevated natural organic matter (NOM) loadings at treatment works. These high levels lead to difficulties in removing sufficient NOM to meet trihalomethane (THM) standards, and hence better alternative treatments are required. Here the removal of NOM was investigated by a new ion exchange process (MIEX) using both bulk and fractionated NOM. Initial results showed that in excess of 80% of the raw water dissolved organic carbon (DOC) and greater than 85% of the UV absorbance from the bulk raw water could be removed by the use of MIEX alone. It was also seen that the removal of the more recalcitrant isolated fractions was increased. When MIEX was combined with a significantly reduced dose of coagulant a slight improvement on the overall DOC and UV removals was observed, however a significant decrease in the amount of THM formation potential (THMFP) in the final water was seen. This combined with the reduction in coagulant would imply a more efficient process during the times when the water becomes increasingly difficult to treat.
Fearing
David A
DA
School of Water Sciences, Building 39, Cranfield University, Cranfield, Bedfordshire MK43 OAL, UK.
Banks
Jenny
J
Guyetand
Soizic
S
Monfort Eroles
Carmen
C
Jefferson
Bruce
B
Wilson
Derek
D
Hillis
Peter
P
Campbell
Andrew T
AT
Parsons
S A Simon A
SA
D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D005290:Ferric Compounds / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D007474:Ion Exchange; D009930:Organic Chemicals / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors; D022882:Trihalomethanes / Q000302:isolation & purification*; D014873:Water Pollutants / Q000032:analysis; D018508:Water Purification / Q000379:methods*
D005290:Ferric Compounds; D006812:Humic Substances; D009930:Organic Chemicals; D022882:Trihalomethanes; D014873:Water Pollutants; D002244:Carbon