Water Quality of a Rural Stream, the Hwapocheon Stream, and Its Analysis of Influence Factors

Abstract

This study was aimed to analyze the water quality characteristics of the Hwapocheon Stream and to be utilized in the further related research. Water in the upper stream became a dammed pool due to the existence of 14 weirs, and pollutants such as both sewage and irrigation water were introduced into the mainstream passing through farming settlements and agricultural land. For these reasons, filamentous cyanobacteria (Oscillatoria sp.) bloomed at the bottom of the dammed pool. Also in the midstream and downstream, tributaries with high pollutant concentrations [e.g., Comocheon (T3) and Yongdeokcheon (T8)] were inflowed, and had a negative impact on water quality of the mainstream, especially nitrogen and phosphorus. In the Hwapocheon Stream, dissolved oxygen (DO) decreased, and suspended solid (SS) increased toward the downstream. The result showed that hydraulic retention time, SS, COD, and concentration of NH4 + were important water quality factors of the Hwapocheon Stream. The high concentration of benthic organic matter and rich in attached algae in the core of Hwapo-wetland were expected to give impact on the water quality of the mainstream. In the spatial manner, water quality showed increasing trend in the weir zone, and it was constant or decreased trend in wetland. In the seasonal manner, the nutrient concentrations were high in the winter dry season, however, the organic matter concentrations were high in spring and summer. Generally, the concentrations of phytoplankton value were 40 µg chl-α/L or less in all reaches except for the high concentrations in the weir and wetland area in June.

Characteristics of Temporal Variation on Water Quality (T-P, T-N, CODMn, SS, BOD5) in the Jungrang Stream during Rainfall Event

“…5,6) 또한 강우 유출수는 강우가 시작되면서 초기강우에 의해 수질오염도가 높아지 는 특성을 지니고 있으며, 7) 유출된 수질오염물질은 지역 및 시간적 특성에 따라 다르게 나타난다고 보고되고 있다. 8) 강우 시 중랑천 유역의 수질(T-P, T-N, CODMn, SS, BOD5)변화 특성 대한환경공학회지 제36권 제6호 2014년 6월 13,14) 에 준하는 방법으로 진행하였으며, 그 방법은…”

Analysis on the Performance Evaluation of a High-Speed Filtering Apparatus for the Treatment of Combined Sewer Overflows (CSOs)

“…According to the USEPA report, CSOs contain all the contaminants, such as organic matter, bacteria, nutrients, ammonia, turbidity, TSS, and toxic substances other than acidic wastewater. A huge amount of these pollutants are discharged through the overflow outlet in a short time, adding to the water body contamination [9]. If CSOs are introduced into rivers and lakes, the proper water quality standards cannot be maintained, causing environmental pollution.…”