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In this paper we studied the start-up of an underground digester with a useful volume of 4 m3 in Saharan medium. 320 kg of waste taken from Adrar city slaughterhouses were treated during 60 days. During this study, we followed several parameters evolution such as: pH, volatile fatty acid (VFA), the temperature inside the digester, chemical oxygen demand (COD), pressure and the volume of biogas produced...
Textile industry is producing large amounts of wastewater heavily colored with high loading of inorganic salts. Two kinds of composite reverse osmosis membranes aimed for advanced treatment of textile dyeing wastewater were investigated, which made up an effective hybrid membrane separation coupled with coagulation-flocculation, micro filtration(MF)-ultra filtration (UF) and reverse osmosis(RO) dual...
This paper reports a scale treatment on purified terephthalic acid (PTA) productive wastewater in a 50L column form reactor by ultrasound enhanced ozonation. The degradation effects of three kinds of productive wastewater including inlet and outlet water from treatment works as well as accident wastewater are investigated. The results show that the ultrasound enhanced ozonation is an efficient way...
In this work, chemical oxygen demand (COD) removal and decolorization of polyester scouring effluent by coagulation-acidation have been studied experimentally. Acidulated bentonite was used as coagulant. The effects of bentonite dosage, PAM dosage, stirring time, and pH after acidation on the efficiency of COD and color reduction were studied by orthogonal methodology. Finally the optimum conditions...
The treatment of chemical effluent is very complex with respect to its characteristics. To treat this effluent, different processes like biological, chemical and physiochemical can be applied based on its characteristics. Attempt was made to reduce COD and TSS. To obtain the optimum removal of COD and TSS, different combinations of coagulant and polyelectrolyte were applied at the laboratory scale...
A preliminary study using gamma radiation on coking wastewater samples was carried out. Chemical oxygen demand (COD), biochemical oxygen demand (BOD) and Ammonia-nitrogen content results were obtained at different doses (1.0, 3.0, 5.0 and 7.0 kGy). As increase of the absorbed doses, a decrease of COD and BOD was observed after irradiation, whereas at the doses of 5 kGy and 7 kGy, the residual concentrations...
Supercritical(sub-critical) water oxidation technology is applied to degrade the explosive wastewater and low its chemical oxygen demand (COD). The technology optimum and reaction dynamics of TNT, RDX, HMX degradation have been investigated. The experiment results show that the optimum degradation technology is: reaction temperature T=648K, reaction time t=5min, the volume proportion of waste water...
Experiments of Fenton oxidation, carbon adsorption, and Fenton oxidation plus carbon adsorption were conducted to develop a cost effective advanced treatment process for treating a biotreated coking plant effluent. Fenton oxidation (Fe2+ = 56 mg/L and H2O2 = 27.2 mg/L) was effective for removing >50% organic pollutants, measured as UV254 (aromatic organics), ViS380 (color ingredients) and COD and...
A four-compartment ABR with an effective volume of 28 L was used to investigate the application of an anaerobic baffled reactor (ABR) in treating sugar-producing wastewater. The results indicated that the reactor could start up at an influent OLR of 2.5 kgCOD/m3-d and temperature of 35degC. COD removal rate could reach 89% on the 5th day. Then the influent COD increased from 5000 to 8000 mg/L, HRT...
Fundamental study of a high speed filtration system using HTS magnet for purifying the used wash water of drum has been made. This system consists of a magnetic seeding device and a magnetic filtration device. Since the wastewater is a mixture of various used wash water, the wastewater treatment is difficult to realize practically. For that reason, the wastewater is processed as industrial waste products...
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