Biochemical oxygen demand ( BOD5 ) values, Chemical oxygen demand ( COD ) values and nutrient content were high, these were attributed to NTPC effluent discharge and retting of coconut husks.
22.
(The WQI, the standard used by the Department of Environment to measure river water quality, takes into consideration parameters like the pH level, biological oxygen demand, chemical oxygen demand and dissolved oxygen.
23.
Such chemicals are also liable to be broken down using strong oxidizing agents and these chemical reactions create what is measured in the laboratory as the chemical oxygen demand ( COD ).
24.
However, many studies also showed the effectiveness of EM application in the reduction such as biochemical or biological oxygen demand ( BOD ) and chemical oxygen demand ( COD ) of wastewater.
25.
The government also stated its objective to improve the rivers'water quality, by managing pollutants such as the increase of Chemical oxygen demand and total phosphorus counts that can result in the waterways'eutrophication.
26.
Oxygen is bubbled through the mixture of wastewater and activated sludge to reduce the organic matter ( measured as biochemical oxygen demand ( BOD ) and chemical oxygen demand ( COD ) ).
27.
Information on the water quality of Mexico's rivers published by the National Water Commission is limited to only two parameters, Biological Oxygen Demand ( BOD ) and Chemical Oxygen Demand ( COD ).
28.
In a study of nutrient-rich river backwaters in the R . Tizsa ( Hungary ), shining pondweed was tolerant of very high phosphate concentrations, so long as chemical oxygen demand and chlorophyll-a concentrations in the water were not too high.
29.
Typically the sludge will have a residence time or sludge age of 1 to 5 days . This means that the chemical oxygen demand ( COD ) removed is relatively little and the effluent is therefore unacceptable for discharge into receiving waters.
30.
It has been applied as biological treatment for mechanical oily effluent, reducing the content of hydrogen peroxide, phenols, and chemical oxygen demand in the oily effluent . " Epicoccum nigrum " pigments have been considered as natural replacements for artificial pigments currently used in food.
