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AWWA WQTC63963
- Impact of Wastewater Treatment Processes on Organic Carbon, Organic Nitrogen, and DBP Precursors
- Conference Proceeding by American Water Works Association, 11/01/2006
- Publisher: AWWA
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Unintentional, indirect wastewater reuse is occurring as upstream wastewater treatmentplant (WWTP) discharges impact downstream drinking water treatment plants. As part of aproject to evaluate the contribution of wastewater to disinfection byproduct (DBP) formation indrinking water, one of the objectives was to compare different WWTP processes for the controlof dissolved organic carbon and nitrogen (DOC and DON), and DBP precursors in effluentorganic matter (EfOM).Nitrification plays a key role in determining the quality of EfOM in terms of traditionalwastewater parameters, natural organic matter character, and DBP-related parameters. Somenitrification strongly altered the levels of total Kjeldahl nitrogen (TKN), ammonia (NH<sub>3</sub>-N),DON, carbonaceous biochemical oxygen demand (CBOD), DOC, ultraviolet absorbance (UVA),and chemical oxygen demand. Good nitrification (NH<sub>3</sub>-N <2 mg/L) augmented the changes forTKN, NH<sub>3</sub>-N, and CBOD; reduced the concentration of biodegradable organic carbon (BDOC);and dramatically changed the ratio of BDOC/DOC. During wastewater treatment, some of theparticulate and DON was transformed to biomass, NH<sub>3</sub>-N, nitrite, nitrate, and/or nitrogen gas,whereas a portion of the DOC was transformed to biomass, carbon dioxide, methane, and/orother gases. Although nitrification reduced the level of UVA, it resulted in an increase inspecific UVA (SUVA). This was probably due to preferential removal of the less UV-absorbing(non- humic) portion of the DOC during biological treatment.A reduction in DOC and UVA corresponded to less precursors for haloacetic acids,whereas removal of DON resulted in less precursors for nitrogenous DBPs (e.g.,haloacetonitriles, N-nitrosodimethylamine). However, on a central tendency basis,trihalomethane precursors were relatively recalcitrant. This information is being used to betterunderstand the impact of improvements in WWTP water quality on DBP precursor loadings inEfOM-impacted drinking-water supplies. Includes 18 references, tables, figures.
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