[ efficiency comparison of conventional activated sludge and stabilization pond systems in removal of cysts and parasitic eggs [a case study: Kermanshah and gilangharb wastewater treatment plants]]

Microbial quality, particularly parasitic characteristics in terms of effluent reuse in agriculture is one of themost important indices. The aim of this study is determination of removal efficiency of Kermanshah wastewater treatment [conventional activated sludge] and Gilangharb wastewater treatment plants [stabilization ponds] for cyst and parasitic eggs. In this study research samples were taken once in five days from both inlet and outlet of wastewater Plants within a period of five months. The identification and counting of cyst and parasitic eggs were carried out by Mac master slide according to Bailenger method. The findings shows that mean of parasitic eggs and protozoan cysts in effluent of Kermanshah wastewater treatment plant were 0.99 +/- 0.42 and 0.90 +/- 0.25 per liter respectively, indeed removal efficiency for parasitic eggs and cysts are%98.42 +/- 3 and%97.5 +/- 4.5 respectively, but, any parasitic eggs and protozoan cysts in Gilangharb wastewater treatment plant was not observed and removal efficiency of these tow parameters was%100. Ascaris lumbricoides eggs had most number in influent and effluent of both plants. As results show, removal efficiency for cysts and parasitic eggs in both abovementioned are desirable, and the quality of effluent treatment plant of both the rate of nematode eggs Anglbrg index [number of nematode eggs: 1 >/- number per liter] is consistent

[ estimation of water consumption, waste water generation and its biodegradability per capita based on social income and meteorological temperature in Kermanshah]

The aim of this study is to investigate water consumption, domestic wastewater generation and organic matter concentration, based on both, economical income and meteorological temperature. The method of this study is descriptive and analytical. A checklist was used to collect data on economical income. Water consumption was obtained based on water bills. Wastewater generation and organic matter such as biochemical oxygen demand [BOD] per capita/ day were measured every four hours, during a day in three regions of Kermanshah city: Kasra, Ellaheiah and Taavon. Comparing water consumption in winter and summer showed significant difference in three regions, mentioned above. The water consumption was [398 +/- 75, 291 +/- 48 and 188 +/- 50] for warm climate and [200 +/- 25, 188 +/- 35 and 140 +/- 41] for three regions respectively in cold weather. In spite of an apparent difference in BOD in three regions, it was not significant statistically. Water consumption has strongly considerable relationship with economical income [r=0.988, P-value<0.001], while the generated wastewater in these regions were not different, statistically for warm climate [220 +/- 60, 204 +/- 15 and 170 +/- 34], and in cold weather [170 +/- 21, 158 +/- 31 and 112 +/- 29], also the generated wastewater did not have considerable difference in cold climate. This study confirms that, the effects of these two parameters, i.e.monthly economical income and environmental temperature on water consumption, generated wastewater and biodegradable organic loading per capita/day is considerable. It was concluded that water consumption and wastewater generations were much more in warm climate than in cold weather. Finally through this study the estimation of water consumption, wastewater generation and BOD concentration becomes possible, which is beneficial for establishment of water consumption