Using the entrapped bioprocess as the pretreatment method for the drinking water treatment receiving eutrophic source water
Journal
Environmental Pollution
Journal Volume
248
Pages
57-65
Date Issued
2019
Author(s)
Wu, P.-H.
Cheng, Y.-C.
Chen, H.-Y.
Chueh, T.-W.
Chen, H.-C.
Huang, L.-H.
Wu, Z.-X.
Hsieh, T.-M.
Chang, C.-C.
Yang, P.-Y.
Abstract
Control of organic matter, nutrients and disinfection byproduct formation is a major challenge for the drinking water treatment plants on Matsu Islands, Taiwan, receiving source water from the eutrophic reservoirs. A pilot entrapped biomass reactor (EBR) system was installed as the pretreatment process to reduce organic and nitrogen contents into the drinking water treatment plant. The effects of hydraulic retention time (HRT) and combination of preceding physical treatment (ultraviolet and ultrasound) on the treatment performance were further evaluated. The results showed that the EBR system achieved higher than 81%, 35%, 12% and 46% of reduction in chlorophyll a (Chl a), total COD (TCOD), dissolved organic carbon (DOC) and total nitrogen (TN), respectively under varied influent concentrations. The treatment performance was not significantly influenced by HRT and presence/absence of physical pretreatment and the effluent water quality was stable; however, removal efficiencies and removal rates of Chl a, TCOD and DOC showed strong correlation with their influent concentrations. Excitation–emission matrix (EEM) fluorescence spectroscopy identified fulvic-like and humic-like substances as the two major components of dissolved organic matter (DOM) in the reservoir, and decreased intensity of the major peaks in effluent EEM fluorescence spectra suggested the effective removal of DOM without production of additional amount of soluble microbial products in the EBR. Through the treatment by EBR, about 10% of reduction of total trihalomethane formation potential for the effluent could also be achieved. Therefore, the overall results of this study demonstrate that EBR can be a potential pretreatment process for drinking water treatment plants receiving eutrophic source water. EBR can be a potential pretreatment process to reduce organic, nitrogen and total trihalomethane formation potential for drinking water treatment plants receiving eutrophic source water. © 2019 Elsevier Ltd
Other Subjects
Biogeochemistry; Effluent treatment; Effluents; Eutrophication; Fluorescence; Fluorescence spectroscopy; Nitrogen; Nutrients; Organic carbon; Potable water; Reservoirs (water); Water quality; Water treatment plants; Dissolved organic carbon; Dissolved organic matters; Hydraulic retention time; Influent concentrations; Organic and nutrient removals; Pretreatment process; Soluble microbial products; Trihalomethane formation potential; Chemicals removal (water treatment); chlorophyll a; dissolved organic carbon; dissolved organic matter; drinking water; fulvic acid; humic acid; nitrogen; organic carbon; organic compound; trihalomethane; unclassified drug; drinking water; nitrogen; trihalomethane; biomass; bioreactor; dissolved organic matter; drinking water; effluent; nutrient; reservoir; water quality; water treatment; Article; chemical oxygen demand; controlled study; disinfection; drinking water treatment plant; effluent; entrapped biomass reactor; eutrophication; excitation emission matrix fluorescence spectroscopy; hydraulic retention time; nitrogen concentration; spectrofluorometry; ultrasound; ultraviolet radiation; water management; water quality; water supply; water treatment; analysis; biomass; chemistry; fluorescence; humic substance; procedures; Taiwan; water pollutant; water quality; Matsu Islands; Taiwan; Biomass; Chlorophyll A; Drinking Water; Eutrophication; Fluorescence; Humic Substances; Nitrogen; Spectrometry, Fluorescence; Taiwan; Trihalomethanes; Water Pollutants, Chemical; Water Purification; Water Quality
Type
journal article