Reciprocal influence of Kürtün Dam and wastewaters from the settlements on water quality in the stream Harşit, NE Turkey

• Published in: Environmental earth sciences 2014-10, Vol.72 (8), p.2849-2860
• Main Authors: Bayram, Adem, Önsoy, Hızır, Kömürcü, Murat İhsan, Tüfekçi, Mehmet
• Format: Article
• Language: English
• Subjects: Ammonium; Biogeosciences; Chemical oxygen demand; Dissolved oxygen; Earth and Environmental Science; Earth Sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental impact; Environmental regulations; Environmental Science and Engineering; Exact sciences and technology; Geochemistry; Geology; Human influences; Hydrology; Hydrology. Hydrogeology; Hydrology/Water Resources; Nitrogen dioxide; Original Article; Pollution, environment geology; Rivers; Terrestrial Pollution; Wastewater discharges; Water hardness; Water pollution; Water pollution control; Water quality; Water resources; Water temperature
• ISSN: 1866-6280; 1866-6299
• DOI: 10.1007/s12665-014-3190-0

This paper aims to reveal the reciprocal influence of Kürtün Dam and wastewaters from the settlements on the water quality in the stream Harşit, NE Turkey. Several key water-quality indicators were measured: water temperature ( T ), pH, dissolved oxygen (DO), electrical conductivity, water hardness, chemical oxygen demand (COD), ammonium nitrogen (NH 4 + –N), nitrite nitrogen (NO 2 − –N), nitrate nitrogen (NO 3 − –N), total Kjeldahl nitrogen (TKN), total nitrogen (TN), orthophosphate phosphorus (PO 4 3− –P), and methylene blue active substances (MBAS). The monitoring and sampling studies were conducted every 15 days from March 2009 to February 2010 at two stations selected in the upstream and downstream of the Kürtün Dam. It was concluded that the Kürtün Dam Lake had a high-quality water in terms of  T , pH, DO, COD, NH 4 + –N, NO 2 − –N and NO 3 − –N values, but slightly polluted water with respect to TKN, PO 4 3− –P, and MBAS according to the Turkish Water Pollution Control Regulation. The dam improved the stream water quality by increasing the DO concentration, and decreasing the NO 2 − –N and PO 4 3− –P concentrations thanks to its hydraulic residence time despite the wastewater discharge by the nearby settlements. However, the wastewater discharge deteriorated the stream water quality increasing the COD, NH 4 + –N, NO 3 – –N, and TN concentrations.