THMs precursor removal by an integrated process of ozonation and biological granular activated carbon for typical Northern China water

Abstract

a b s t r a c tThe removal of trihalomethanes (THMs) precursor and natural organic matter (NOM) by an integrated process of ozonation and biological granular activated carbon filtration (BGAC) as a deep water treatment process was investigated in pilot-scale tests. A comparison is also made with granular activated carbon filtration (GAC). The characteristics of the THMs precursor and the THMs formation potential (THMFP) were investigated by resin adsorption and ultrafiltration. The results show that the integrated process of ozonation and BGAC (O 3 /BGAC) is obviously superior to GAC for the removal of the THMs precursor because a considerable synergetic effect occurs between the ozonation and the BGAC. Although ozonation can limitedly remove dissolved organic carbon (DOC), it can cut down the molecular weight of the NOM, change its polarity, decrease the THMFP, and obviously enhance the efficiency of the BGAC. The BGAC could efficiently remove the hydrophobic base (HoB), hydrophobic neutral (HoN), weakly hydrophobic acid (WHoA), and low molecular weight fraction DOC that was produced in the optimized ozonation process. However, the BGAC stage should be carefully controlled to avoid the leakage of microbes and/or the products of metabolism because it has a high risk for producing THMs in following chlorination process.

Optimization and effect of powdered activated carbon addition on commingled chemical industrial wastewater treatment in a sequencing batch reactor

“…In the effluent of the PAC and PAC-SBR systems, the fluorescence peak C disappeared after the treatment. This result suggested that these organic compounds were easily adsorbed by PAC, which was also illustrated in previous researches [28,29]. Therefore, PAC helped to remove the compounds that were difficult for micro-organisms to biodegrade.…”

Chlorine for Water Disinfection: Properties, Applications and Health Effects

“…The colorization, unpleasant odors and unpleasant tastes in 1 Chlorine for Water Disinfection: Properties, Applications and Health Effects water can be attributed to NOM. The NOM is also responsible to bacterial regrowth through the network distribution systems (Yan et al 2010). Over the years, various technologies and processes have been investigated for reducing the NOM during water treatment.…”

“…The NOM can be partially removed using a conventional treatment (coagulation, flocculation, sedimentation and filtration) or by using granular activated carbon (GAC) (Sadiq and Rodriguez 2004;Hanigan et al 2012). Another effective method to control DBPs in drinking water is the use of alternative disinfection processes such as ozonation (Yan et al 2010), photocatalysis (Murray and Parsons 2006), photo-electro-catalysis (Selcuk and Bekbolet 2008), direct photolysis (UV) (Hansen et al 2013) and electrochemical disinfection (Matilainen and Sillanpää 2010) among others. Besides, a better control of operational factors (e.g.…”

Fate of Organic Pollutants in a Full-Scale Drinking Water Treatment Plant Using O3-BAC

“…Recently, some researches carried on bench-scale or pilotscale O 3 -BAC experiments and proved an effective removal of TOC (total organic carbon), UV254 (ultraviolet absorbance under 254 nm), turbidity, ammonia, and DBPs precursors by the O 3 -BAC system (Chu et al 2012;Guo et al 2013;Yan et al 2010). Studies on wastewater treatment or water reclamation plants also found O 3 -BAC effective in removing organic chemicals and reducing biological activity and toxity of water (Qian et al 2013;Reungoat et al 2010;Reungoat et al 2012).…”