EFFICIENCY OF COMBINED; PINE BARK, ACTIVATED CHARCOAL AND SAND FILTER FOR THE TREATMENT OF GREY WATER

BEFKADU AREGA ADMASU, Dr. AMARE TIRUNEH
2019
Grey water is a potential resource of waste water that can be improved to meet the quality needed for irrigation. This research will focus on the performance evaluation of combined; pine bark, activated charcoal and sand filters for the treatment of grey water that comes from two lounges of ADDIS ABABA Science and Technology University. Three stages of treatment mechanism was undertaken in the research which are treatment chamber one (screening stage) follow pre-treatment mechanism by using
more » ... hanism by using 0.1cm and 0.2cm diameter plastic mesh inside the reservoir, treatment chamber two (filtration stage) is the main step and most of the treatment takes place using the above three filter materials. The filter materials depth is 20cm for each type of treatment materials such as pine bark, activated charcoal and sand.at the bottom of the column there is coarse gravel with 0.3cm-0.5cm effective size and 10cm depth making under drain stage possible. First pure water was feed for 15 days to clear filter materials in order to get best quality after that the grey water was batch feed for fifteen days with a quantity of three discharge rates which are 16l/day, 8l/day and 4l/day. A series of experiments was examined for characterization of grey water but effluent whose discharge rate 4 l/day gives the best value for this parameters; ammonia as nitrogen, phosphorus, ammonia, salinity, total coliform, total solid, total dissolved solid, biological oxygen demand, chemical oxygen demand and PH were equal to 0.04mg/l, 1.57mg/l, 0.03mg/l, 0.74ppm, 14*107cfu/ml, 422mg/l, 243mg/l, 39mg/l, 81mg/l and 7.68. This shows that the effluent is applicable for surface irrigation based on USEPA wastewater quality standards. The null hypothesis for BOD5, COD, salinity, total coliform and TS show significant difference because p<0.05. But for P, NH3-N, NH3, PH and TDS the hypothesis become insignificance because p>0.05
doi:10.20372/nadre/3875 fatcat:u4asqz3xf5hnlojh3g4eicclrq