Treatment and disposal of nata de coco wastewater
1995
Amongo, R.M.C.
The physical and chemical characteristics of nata de coco wastewater exceeded the maximum permissible limits of the Revised Water Usage and Classification of Water Quality Criteria issued by DENR [Department of Environment and Natural Resources, Diliman, Quezon City, Philippines]. Nata de coco wastewater is a high strength waste as indicated by its high COD [chemical oxygen demand] value ranging from 37,500 to 120,000 mg/li. The movement of nata de coco wastewater in the soil is directly related to soil texture. Slower wastewater infiltration was observed in fine textured soil such as clay soil compared to silty clay soil used in the lysimeter study. The quality parameters of nata wastewater except for pH, decreased with soil depth. However, most residual concentrations for the parameters measured still exceeded the maximum permissible limits for effluents. These could pose pollution hazards to the ground water resources. The quality of soil was affected with the application of 10 liters nata wastewater. The values of pH and available phosphorus content of silty clay and clay soils decreased while CEC and total nitrogen content increased at 0 to 10 cm sampling depth. The application of 10 liters wastewater could alter soil quality at 0 to 10 cm layer of the soil. In general, nata de coco wastewater should not be directly dispose to land and water due to the hazards it could bring. Treatment processes such as neutralization, aerobic or anaerobic treatment should be done first before its ultimate disposal to the environment
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