Effects of water quality on the coagulation performances of humic acids irradiated with UV light

doi:10.1007/s11783-014-0749-7

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (1) : 147-154 https://doi.org/10.1007/s11783-014-0749-7

RESEARCH ARTICLE

Effects of water quality on the coagulation performances of humic acids irradiated with UV light

Wendong WANG^1,^2,^*(

),Qinghai FAN¹,Zixia QIAO¹,Qin YANG³,Yabo WANG¹,Xiaochang WANG¹

1. Department of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2. Zhejiang Provincial Key Laboratory of Water Science and Technology, Jiaxing 314006, China
3. Department of Chemistry, Xi’an University of Architecture and Technology, Xi’an 710055, China

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Abstract

The presence of humic acid in drinking water treatment has received significant attention in recent years because of its adverse effects on the removal of many pollutants in coagulation. In this paper, the effects of water quality including pH, turbidity, alkalinity, and hardness on the removal of humic acid were investigated in a UV light hybridized coagulation process. Our results suggested that UV light radiation could effectively improve the removal rate of humic acid in coagulation under both neutral and basic conditions, and the variations of the selected water quality parameters had little adverse effect on the function of UV light. After UV light radiation, the removal rate of the nitro-humic acid (NHA) increased from 20% to 60% in coagulation, and increased further to 75% and 85% for the raw waters with 10.0 NTU kaolin and 100 mg·L^-1 hardness, respectively. In addition to NHA, the removal rates of the humic acid extracted from peat coal (PHA) and the humic acid provided by Japan metals and chemicals company (JHA) in coagulation were also improved, both in the range of 80%–90% after undergoing UV light radiation. By changing the radiation location from prior to coagulation to the flocculation process, similar experimental results were obtained. The formation of positive charged sites after UV light radiation was considered to be the primary factor that led to an enhanced removal of the humic acid in coagulation.

Keywords coagulation drinking water humic acid UV light radiation water quality

Corresponding Author(s): Wendong WANG

Online First Date: 31 July 2014 Issue Date: 31 December 2014

Cite this article:

Wendong WANG,Qinghai FAN,Zixia QIAO, et al. Effects of water quality on the coagulation performances of humic acids irradiated with UV light[J]. Front. Environ. Sci. Eng., 2015, 9(1): 147-154.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0749-7
https://academic.hep.com.cn/fese/EN/Y2015/V9/I1/147

Tab.1 Synthetic water quality parameters and levels selected in single factor experiments

Fig.1 Experimental equipment used in (a) UV radiation and (b) coagulation combined with UV light radiation

Fig.2 Effects of pH on the zeta potential of the NHA solution and the removal of NHA in the coagulations with and without UV light radiation (PACl dosage: 25 mg·L^-1; water temperature: 15°C; number of replicate experiments, N = 3)

Fig.3 Coagulation performances of PHA and JHA pretreated with UV light under different pH conditions (PACl dosage: 25 mg·L^-1; water temperature: 15°C)

Fig.4 FT-IR spectra of NHA, JHA, and PHA before and after undergoing UV light radiation

Fig.5 Effects of turbidity (a), alkalinity (b), and hardness (c) in the raw water on the removal of NHA in the coagulation with and without UV light radiation at pH 7.0 (PACl dosage: 25 mg·L^-1; water temperature: 15°C; number of replicate experiments, N = 3)

Fig.6 Effects of UV light pretreatment on the molecular distribution and coagulation performance of the NHA at pH 7.0 (PACl dosage: 25 mg·L^-1; number of replicate experiments, N = 3)

Fig.7 Coagulation performances of NHA with UV light radiated before and during flocculation under different pH conditions (PACl dosage: 25 mg·L^-1; water temperature: 15°C)

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