Soil treatment of wastewater from Khon Kaen psychiatric hospital: a case study of soil treatment

Abstract

The objective of this research was to study wastewater treatment at Khon Kaen Psychiatric Hospital by Soil Treatment with differences both of soil texture and bulk density. Roi-et and Nam Phong soil series are ne and coarse textured soils, respectively. Wastewater characteristics were studied in terms of impurity reduction such as DO (Dissolved Oxygen), COD (Chemical Oxygen Demand) and TKN (Total Kjeldahl Nitrogen). Wastewater samples were collected at two stages of treatment (before and after) by different soil texture and density. Results of this study show the values of the above parameters after treatment by soil were lower than their values before treatment. These lower values after ow through the Soil Treatment method follow the standard criteria of domestic wastewater by the Ministry of Public Health. Roi-et soil series at bulk density 1.70 gm/ cm3 and Nam Phong soil series at bulk density 1.90 gm/ cm3 give well-treated wastewater. The wastewater can be well treated in ne textured soil. Soil physical properties showed that after wastewater treatment, soil bulk density was decreased and saturated hydraulic conductivity was increased. Moreover, Soil Treatment can reduce impurities in wastewater, is convenient and less expensive for maintenance.