Generation and characterization of DOM in wastewater treatment processes

Abstract

Wastewater reuse for resolving water shortage is increasingly emphasized. The presence of DOM in wastewater is a main consideration for wastewater reuse. Therefore, systematic understanding of characteristic changes of DOM in different wastewater treatment processes is needed. As biotechnology together with disinfection operation has been used widely by WWTPs to treat wastewater, this review aims to introduce the recent advances in the effects of wastewater biological treatment and disinfection on the characteristics of DOM. Firstly, the composition of DOM in WWTPs is introduced. Then, the effects of wastewater treatments on hydrophobicity, MW distribution and optical characteristics of DOM and their correlations are reviewed. Also, the influences of wastewater treatments on biodegradability and biotoxicity of DOM are discussed. Finally, the environmental impact of effluent DOM is summarized. Since the discharge of wastewater effluent DOM to the environment not only influences nutrient uptake by bacteria, plankton and algae, and phototransformation rate of micropollutants in natural water, but also changes DOM level and physicochemical properties of soil.

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

“…), location, the season of the year and the operating conditions (temperature, pH, flow, etc.) [11].…”

“…Its transformation and the generation of by-products during WWTP processes may change the biological properties and environmental impact of the DOM, but the knowledge about its transformation in the WWTPs is still limited. A recent review on this subject described the characterization of DOM based on its MW distribution, hydrophobicity and optical properties [11]. Several analytical techniques have been used to characterize the chemistry and reactivity of the DOM components, including physicochemical analysis, spectroscopic, chromatographic, and thermal degradation methods, and other fractionation techniques [10].…”

Seasonal Variations of Dissolved Organic Matter by Fluorescent Analysis in a Typical River Catchment in Northern China

“…Wastewater could affect DOM biodegradability by changing hydrophobicity, MW and the main components [1]. The negative influence of industrial land on DOM could be applied to the SCs (p < 0.05), so this kind of land type did not play a role in replenishing DOC or CDOM in summer before rain (Figure 5b), or even suppressing the production or accumulation of DOM.…”

“…Dissolved organic matter (DOM) is a key signal of water quality, nutrient content, environmental pollution, heavy metal migration and biogeochemical processes in freshwater. The characteristics of DOM generally depict molecular weight (MW) distribution, hydrophobicity, and optical properties [1]. The components of CDOM are complex and can be identified and quantitatively described by UV-Vis and fluorescence (excitation-emission matrix, EEM) spectra [2][3][4][5][6].…”

Reuse treatment with ozonation, biofiltration, and activated carbon adsorption for total organic carbon control and disinfection byproduct regulation compliance

“…O. Lee et al, 2012;Li, Shi, Li, & Zhang, 2015;Reungoat et al, 2012). Ozonation has been shown to transform high-molecular-weight EfOM into smaller-molecularweight fractions, which are more biodegradable and readily removed by downstream biofiltration (Wang & Chen, 2018). Similar decreases in TTHM and HAA5 formation, 21%-30% and 38%-55%, respectively, have been shown with acclimated anthracite and BAC media, either at full scale or using media sampled from a full-scale facility after multiple years of use (Arnold et al, 2018;Farré et al, 2011).…”