These measures lead to a steady decrease in the biochemical oxygen demand in the river, and in the Rother . experience on the River Dearne and elsewhere would suggest that it may be many years before leaching of chemicals into the river finally ceases.
42.
Much of the equipment was in need of renewal, and levels of suspended solids, biochemical oxygen demand and total ammonia allowed in treated effluent were to be lowered from 31 March 2017, under the terms of the Freshwater Fish Directive and the Water Framework Directive.
43.
A vermifilter may have removal efficiencies for Biochemical Oxygen Demand ( BOD 5 ) more than 90 %, Chemical Oxygem Demand ( COD ) more than 85 %, Total Suspended Solids ( TSS ) more than 98 % and NH 4 + more than 75 %.
44.
The treatment process significantly reduced the biochemical oxygen demand of the effluent discharged to the river, but was not good at removing ammonia, which was a major contributor to the poor water quality of the river below the works, and the destruction of the fish populations.
45.
The Tunasan river received media attention in 1994 and 1995 due to a series of " fish kills " caused by the high Biochemical Oxygen Demand from decomposing water lilies, and by the profusion of residential wastes that find their way into the river during the rainy season.
46.
National Pollutant Discharge Elimination System regulations require monthly average effluent concentrations of biochemical oxygen demand and of total suspended solids to be no greater than 30 mg / L, with an additional requirement for removal of 85 percent of the quantities measured in untreated sewage from the City of Arcata.
47.
Though there is a national norm regulating pollution limits in untreated waste water, CONAGUA reported that the Valley of Mexico basin had 50 % heavily contaminated, 25 % contaminated, 20.8 % acceptable, and only 4.2 % excellent water quality based on Biochemical Oxygen Demand ( BOD ) levels sampled at selected sites.
48.
Permits typically require reporting of wastewater flow and the results of one or more chemical tests, such as pH, biochemical oxygen demand ( BOD ), total suspended solids ( TSS ), nutrients ( nitrates and phosphorus ), various toxic pollutants, temperature, etc . Some permits also require aquatic biomonitoring of the receiving waterbody.
49.
The average for Fanno Creek between 1986 and 1995 was 55 but steadily improved to 65, or " poor ", Measurements of water quality at the Tigard site during the years covered by the DEQ report showed high concentrations of phosphates, fecal coliform bacteria, and suspended solids, and a high biochemical oxygen demand.
50.
In a recent sensitivity waste load model ran by the Laguna Lake Development Authority's ( LLDA ) Integrated Water Resources Management ( IWRM ) division, it revealed that 70 % of biochemical oxygen demand ( BOD ) loadings came from households, 19 % from industries, and 11 % came from land run-off or erosion ( LLDA, 2005 ).
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