Cyanobacterial Bioassay (AGP test) on the Water Fertility of Treated Wastewater Effluents Discharged into Euiam and Paldang Reservoirs, Korea.

Seo, Wanbum; Lee, Su-Woong; Kim, Keon-Hee; Park, Chaehong; Choi, Bong-Geun; Sim, Yeon Bo; Hwang, Soon‐Jin; Shin, Jae-Ki

doi:10.11614/ksl.2017.50.1.079

Cited by 1 publication

(4 citation statements)

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“…The water quality of the multiple-reservoir series in the water system of the North Han River featured a mutual longitudinal cause and effect based on its hydrological structure [ 37 , 40 , 52 ]. Generally, harmful cyanobacterial blooms in the long reach from the Euiam to the Paldang Reservoirs are based on the Gongji Stream estuary (EA2) and Sambong–ri (PD1) sites [ 37 , 52 , 53 ]. The severity of these blooms was greater at the EA2 site according to the pollution source structure.…”

Section: Discussionmentioning

confidence: 99%

“…The persistent harmful cyanobacterial bloom that occurred in the Euiam Reservoir might be attributed to a combination of natural (meteorological factors, such as light and temperature) and anthropogenic (point or nonpoint pollution sources and hydrological fluctuations in dam operation) conditions [ 37 , 54 , 55 , 56 ]. Point sources with high contributions to eutrophication and harmful cyanobacterial blooms throughout the year must be highlighted [ 38 , 52 ]. Therefore, the frequent occurrence of harmful cyanobacterial blooms with levels of >1000 mg Chl- a m −3 up to 2011 could be attributed to the extremely high supply of P nutrients throughout the year [ 38 , 42 ].…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, no major outbreaks of harmful cyanobacteria were observed after 2011, and odorous substances were hardly detected [ 41 , 42 ]. Although TP was reduced by 54.1% in the treated wastewater in 2012 and 87.6% in 2013–2014, these values were not sufficient to derive a conclusion based on the effects of point sources alone [ 52 , 57 ]. The threshold and sufficiently sustained concentrations to induce eutrophication and phytoplankton growth in the reservoirs were 35 and 3 µg P L −1 , respectively [ 58 , 59 ].…”

Section: Discussionmentioning

confidence: 99%

“…The threshold and sufficiently sustained concentrations to induce eutrophication and phytoplankton growth in the reservoirs were 35 and 3 µg P L −1 , respectively [ 58 , 59 ]. The discharge concentrations of the treated wastewater were maintained at high levels [ 52 ], and the release of P from polluted sediment layers and internal biogenic P-load potential (e.g., recruitment) must be considered [ 38 , 42 , 60 , 61 ].…”

Section: Discussionmentioning

confidence: 99%

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Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade

Shin

Park

Kim

et al. 2022

IJERPH

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Understanding water quality events in a multiple-impoundment series is important but seldom presented comprehensively. Therefore, this study was conducted to systematically understand the explosion event of geosmin (GSM) in the North Han River (Chuncheon, Soyang, Euiam, and Cheongpyeong Reservoirs) and Han River (Paldang Reservoir), which consists of a cascade reservoir series, the largest drinking water source system in South Korea. We investigated the spatiotemporal relationship of harmful cyanobacterial blooms in the upstream reservoir (Euiam) with the water quality incident event caused by the GSM in the downstream reservoir (Paldang) from January to December 2011. The harmful cyanobacterial bloom occurred during August–September under a high water temperature (>20 °C) after a heavy-rainfall-based flood runoff event. The high chlorophyll-a (Chl-a) concentration in the upper Euiam Reservoir was prolonged for two months with a maximum concentration of 1150.5 mg m−3, in which the filamentous Dolichospermum circinale Kütz dominated the algal community at a rate of >99%. These parameters remarkably decreased (17.3 mg Chl-a m−3) in October 2011 when the water temperature decreased (5 °C) and soluble reactive phosphorus was depleted. However, high and unprecedented GSM concentrations, with a maximum value of 1640 ng L−1, were detected in the downstream reservoirs (Cheongpyeong and Paldang); the level was 11 times higher than the value (10 ng L−1) recommended by the World Health Organization. The concentrations of GSM gradually decreased and had an adverse effect on the drinking water quality until the end of December 2011. Our study indicated that the time lag between the summer–fall cyanobacterial outbreak in the upstream reservoir and winter GSM explosion events in the downstream reservoirs could be attributed to the transport and release of GSM through the effluent from hydroelectric power generation in this multiple-reservoir system. Therefore, we suggest that a structural understanding of the reservoir cascade be considered during water quality management of drinking water sources to avoid such incidents in the future.

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