a research was conducted at kauma oxidation ponds, a sewage water treatment plant found in lilongwe, malawi with an aim of establishing the efficiency of these sewage treatment ponds in treating sewage wastewater. water samples from the effluent discharging points in the maturation ponds were collected and analysed in the labouratory for, bod, coliform bacteria, total nitrogen (tn), phosphorous...

background: a new biological domestic wastewater treatment process, which has been presented these days in activated sludge modification, is upflow sludge blanket filtration (usbf). this process is aerobic and acts by using a sludge blanket in the separator of sedimentation tank. all biological flocs and suspended solids, which are presented in the aeration basin, pas through this blanket. the ...

Background & Aims of the Study: Wastewater discharges from vegetable oil industry cause environmental problem, including pollution of groundwater and surface water. Therefore, this study evaluated the efficiency of Integrated Fixed-Film Activated Sludge (IFAS) reactor for treatment of wastewater from Varamin vegetable oil industries. Materials & Methods: This was an experimental study. The ...

A bioreactor equipped with hollow fiber microfiltration membranes was applied for wastewater treatment. Removal of chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) was investigated. The experimental setup consisted of influent and effluent tanks, and membrane modules using Polyvinyl Di–Fluoride (PVDF) hollow fibers. The operation program included suction and backwash...

The concept, design and performance analysis of a four-stage novel constructed wetland system (CWs) capable of enhanced and simultaneous removal of phosphorus (P) and organic matter (OM) from wastewaters is described. Alum sludge, a largely available by-product of drinking water facilities using aluminium salts as coagulant was used as the media. Under a hydraulic loading rate of 1.27 m(3)/m(2)...

Finding the most probable parse tree in the framework of Data-Oriented Parsing (DOP), a Stochastic Tree Substitution Parsing scheme developed by R. Bod (Bod 92), has proven to be NP-hard in the most general case (Sima’an 96a). However, introducing some a priori restrictions on the choice of the elementary trees (i.e. grammar rules) leads to interesting DOP instances with polynomial time-complex...