scholarly journals Impact of UV irradiation on disinfection by-product formation and speciation from post-chlorination of dissolved organic matter

2021 ◽  
Author(s):  
Ziming Zhao ◽  
Madhumita B. Ray ◽  
Ted Mao ◽  
Wenjun Sun
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Uv Irradiation ◽  
Product Formation ◽  
Residual Chlorine ◽  
Maximum Increase ◽  
Formation Potential ◽  
Trihalomethane Formation Potential ◽  
Irradiation Dosage ◽  
Low Dosage

Abstract The objective of this study was to investigate the effects of combined low-pressure ultraviolet (UV)irradiation and chlorination on the formation of disinfection by-products (DBPs) from different dissolved organic matter (DOM) as DBP precursors. Commercially available humic acid (HA), extracellular organic matter (EOM) from green algae, cyanobacteria, and diatom, namely Scenedesmus quadricauda (SQ), Merismopedia sp. (Msp), and Phaedactylum tricornutum (PT), were used as the sources of DOM. The DBP formation increased with increasing total residual chlorine; EOM from PT presented the highest formation potential followed by HA, Msp, and SQ. The low dosage of 40 mJ/cm2 UV irradiation is insignificant to change the DBP formation from HA and SQ; however, it decreased the DBP formation from bromide-containing EOM of PT and promoted the DBP formation from EOM of Msp at various total residual chlorines. The DBP formation of each DOM correlated well with total residual chlorine. The maximum DBP formation potential (DBPFP) reduction of 42.25 and 13.75% for haloacetic acid formation potential (HAAFP) and trihalomethane formation potential (THMFP) was obtained at the UV irradiation dosage of 300 mJ/cm2 for EOM of PT. However, for the EOM derived from Msp, a maximum increase of 58.1 and 51.1% for HAAFP and THMFP was observed after UV-chlorination.

Effect of ozone on disinfection by-product formation of algae

1998 ◽  
Vol 37 (2) ◽  
pp. 49-55 ◽  
Author(s):  
Jeanine D. Plummer ◽  
James K. Edzwald
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Source ◽  
Product Formation ◽  
Organic Carbon Content ◽  
Drinking Water Source ◽  
Formation Potential ◽  
Trihalomethane Formation Potential ◽  
Extracellular Organic Matter ◽  
Algal Suspension

The presence of algae in a drinking water source can have a significant impact on the treatment of that water. Algae and their extracellular organic matter can be precursors for disinfection by-product (DBP) formation which is of concern for treatment plants that employ pre-chlorination. This research examined the DBP formation of suspensions of Scenedesmus quadricauda, a green alga, and the effect of ozonation on that formation. Trihalomethane formation potential (THMFP) was found to increase by 10% to 30% when preozonation was applied versus non-ozonated samples. A slight increase in haloacetic acid (HAA) formation was also observed in the ozonated samples. Ozonation caused an increase in the dissolved organic carbon content of the algal suspension, thereby increasing the concentration of precursors. The alkalinity of the water did not significantly affect the formation potential of either THMs or HAAs.

Reduction of fractionated dissolved organic matter and their trihalomethane formation potential with enhanced coagulation

ScienceAsia ◽  
2013 ◽  
Vol 39 (1) ◽  
pp. 56 ◽  
Author(s):  
Charongpun Musikavong ◽  
Kamonnawin Inthanuchit ◽  
Kanjanee Srimuang ◽  
Thunwadee Tachapattaworakul Suksaroj ◽  
Chaisri Suksaroj
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Enhanced Coagulation ◽  
Formation Potential ◽  
Trihalomethane Formation Potential

Enhanced Coagulation for Removal of Dissolved Organic Matter and Trihalomethane Formation Potential from Raw Water Supply in Sri-Trang Reservoir, Thailand

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Tassana Kueseng ◽  
Thunwadee Tachapattaworakul Suksaroj ◽  
Charongpun Musikavong ◽  
Chaisri Suksaroj
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Supply ◽  
Cationic Polymer ◽  
Ultraviolet Absorption ◽  
Raw Water ◽  
Polyaluminum Chloride ◽  
Formation Potential ◽  
Trihalomethane Formation Potential ◽  
Coagulation Process

The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and trihalomethane formatation potential (THMFP) removal from a raw water supply with low turbidity and specific ultraviolet absorption (SUVA). Coagulation conditions were optimized using polyaluminum chloride (PACl), PACl with dry cationic polymer (polymer), and PACl with polymer and powder activated carbon (PAC). DOM was measured in terms of dissolved organic carbon (DOC) and ultraviolet absorption at a wavelength of 254 nm (UV-254). Results show that the optimal condition for PACl, PACl and polymer, and PACl with polymer and PAC coagulation were PACl 20 mg/L at pH 7, PACl 20 mg/L and polymer 0·1 mg/L, and PACl 20 mg/L with polymer 0·1 mg/L and PAC 10 mg/L, respectively. When the DOM contents in coagulated water were fractioned to be hydrophilic (HPI) and hydrophobic (HPO) groups, it was found that the coagulation process could effectively remove more DOC of HPO than DOC of HPI. The coagulation using PACl combined with polymer and PAC provided the highest level of DOC of HPI, DOC of HPO, Trihalomethane formation potential (THMFP) of HPI, and THMFP of HPO removal efficiencies and were shown to be 65%, 75%, 77%, and 79%, respectively.

scholarly journals Source identification and characteristics of dissolved organic matter and disinfection by-product formation potential using EEM-PARAFAC in the Manas River, China

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28476-28487
Author(s):  
Xinlin Wang ◽  
Yanbin Tong ◽  
Qigang Chang ◽  
Jianjiang Lu ◽  
Teng Ma ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Source Identification ◽  
Product Formation ◽  
Formation Potential ◽  
Humification Degree

Humic-like and protein-like components were identified by PARAFAC. THMs FP was significantly correlated with components C1 and C1 + C2. The source, types and humification degree of DOM affect the formation of DBPs.

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