Loading and Distribution of Organic Materials in Maninjau Lake

Abstract

Maninjau Lake utilization for the development of fish farming system floating net (KJA) already exceeded the carrying capacity of the number KJA waters in 2012 as many as 15 860 plots are used to maintain tilapia and carp, so the impact of organic matter pollution load is high enough. Water quality research and loading of organic matter and its distribution has been carried out in Maninjau Lake in July 2013. Quality of the surface water dissolved oxygen at each station showed almost the same conditions ranged from 5.70 to 6.77 mg/L, except for dissolved oxygen at a depth of 15 meters ranged from 3.26 to 4.12 mg/L, pH ranged between 8-10, low brightness range between 1.2-2.0 meters and electrical conductivity ranges quite high ranging from 33.66 to 45.32 ms/cm. Total organic content (TOM) on Koto Malintang station at 19.94 mg/L, Koto Kaciek station at 16.69 mg/L, Bayur 9.32 mg/L, the station on the lake outlets Hydropower Intake of 9.35 mg/L and Sigiran station at 14.10 mg/L. TOM accumulation in Maninjau Lake was 10.59 mg /L or 53.10% of the incoming load of KJA. KJA organic load of waste since 2001-2012 in Maninjau Lake have accumulated as much as 167,790.91 tons per year as the average load 13982.57 tons.