Characterization of Natural Organic Matter in Conventional Water Treatment Processes and Evaluation of THM Formation with Chlorine

Table 2

DOC mass balance and recovery for each water treatment unit.

Water source	Molecular dimension distances	DOC	Sample volume	DOC mass	DOC distribution
	Dalton (D)	(mg/L)	(L)	(mg)	(%)
Raw water	Raw water	5.68	0.18	1.0224
	>30000 D (30 K)	0.13	0.54	0.0702	6.23
	30000–10000 D (30–10 K)	0.12	0.54	0.0648	5.75
	10000–5000 D (10 K–5 K)	0.14	0.54	0.0756	6.71
	5000–3000 D (5 K–3 K)	0.16	0.54	0.0864	7.67
	3000–1000 D (3 K–1 K)	0.18	0.54	0.0972	8.63
	<1000 D (<1 K)	4.1	0.18	0.738	65.01
	Total mass = >30 K + 30–10 K + 10–5 K + 5–3 K + 3–1 K + <1 K			1.1268	100
	Recovery (%) = raw water/total mass				110.21
Ozonation	Ozonated water	5.53	0.18	0.9954
	>3000 D (>3 K)	0.25	0.54	0.154286	16.46
	1000–3000 D (1 K–3 K)	0.15	0.54	0.0594	6.34
	<1000 D (<1K)	4.02	0.18	0.7236	77.20
	Total mass = >3 K + 1–3 K + <1 K			0.937286	100
	Recovery (%) = ozonated water/total mass				106.2
Coagulation-flocculation	Coagulated water	4.1	0.18	0.738
	>3000 D (>3 K)	0.15	0.54	0.081	11.36
	1000–3000 D (1 K–3 K)	0.12	0.54	0.0648	9.09
	<1000 D (<1 K)	3.17	0.18	0.567	79.55
	Total mass = >3 K + 1–3 K + <1 K			0.7128	100
	Recovery (%) = coagulated water/total mass				103.53
Filtration	Filtrated water	3.19	0.18	0.5742
	>3000 D (>3 K)	0.12	0.54	0.054	10.10
	1000–3000 D (1 K–3 K)	0.1	0.54	0.0216	4.04
	<1000 D (<1 K)	2.55	0.18	0.459	85.86
	Total mass = >3 K + 1–3 K + <1 K			0.5346	100
	Recovery (%) = filtrated water/total mass				107.41