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Dielectric Barrier Discharge Plasma (DBD) is one of cold plasma type. In this research, DBD plasma was used for reducing Chemical Oxygen Demand (COD) on industrial rubber waste. In the environment field DBD plasma is used as a water treatment and reduction of gas emissions (COx, NOx, and HC). In the development DBD plasma can be used as a wastewater treatment technology. Plasma is formed when a high...
The wastewater containing alcohol ethoxylates (AEs) from the processing of Orimulsion was treated by ozonation with the presence of activated carbon (AC) in a laboratory-scale reactor. Effect of some operating parameters, such as the AC amount, initial pH, and the ozonized-air flowrate, on the COD removal were investigated. The results show that the application of catalytic ozonation of AC can significantly...
The avermectin wastewater was treated with SBR technique. This paper was focused mainly on the removal rate of COD and change of ammonia nitrogen of influent and effluent. At the stable phase of SBR reactor operation, the removal rate of COD could be about 75% when the influent volume load was 1.01 kg/(m3 d), and the effluent COD was below 300 mg/L. Temperature had a great impact on the effect of...
COD, TN and TP removal efficiency was studied in different C / N in the system by changing the dosage of CH3COONa. The best results obtained by experiment is that when the C / N is between 4 and 6. The average COD effluent concentration is 40.08mg / L, the removal rate is 87.5%;the average TN effluent concentration is 9.32 mg / L, the removal rate is 83.91%; the TP average effluent concentration is...
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...
The present study focused on investigation of biological nitrogen removal efficiency and the superiority of continuous feeding sequencing batch reactor system with a frequent anoxic-aerobic alternation strategy. The result indicated that continuous feeding SBR achieved an excellent efficiency for pollutants removal. The removal efficiency of COD and NH4+-N reached above 90% and 91.4% respectively...
A/O-MBR was conducted to treat simulated sewage and domestic sewage in this paper, and degradation of pollutants in reactor was studied at the same time. The results showed that the process had excellent removal efficiency of pollutants, under the conditions of C/N was 8:1~10:1, MLSS was 5~9g/L, HRT of part A was 3.93h, HRT of part O was 5.5h, DO of part A was 0~0.5mg/L, DO of part O was 1~3mg/L....
The inhibitory effect of streptomycin on methane production of anaerobic granular sludge treating starch wastewater was investigated. The results indicated that the methane production of anaerobic granular sludge was influenced in the presence of streptomycin ranged from 0 to120 mg/L. The larger final methane production, the less remaining COD and the higher final pH value at the end of tests were...
The alkaline wastewater from oil refinery is a high concentration alkaline wastewater, which contains a great deal of sulfide, phenol and oil pollutants. A novel two stage circulating biological aerated filter (CBAF) was used to treat the alkaline wastewater after its neutralization. The factors of various air/water volumetric ratio, hydraulic retention time (HRT), which affected the removal of COD,...
In order to investigate the effect of COD in aeration phase and variation of OUR, an anaerobic/aerobic SBR process was used for treating real domestic wastewater. The experiment was carried out in four cases with different COD concentration (91.3mg/L, 139.7mg/L, 211.7mg/L, 397.8mg/L) at the beginning of aerobic phase. During the first 30min of aerobic phase in each case, COD was still under decomposition...
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...
Both coagulation and SBR are effective techniques for treatment of papermaking wastewater. In this paper, the removal efficiencies of COD in papermaking wastewater are investigated by the processes of coagulation, SBR and coagulation-SBR combined processes. The effects of coagulant type, the dosage of coagulant, pH and stirring rate on treatment efficiency are explored in the paper. The results showed...
Bio-hydrogen production of starch wastewater by anaerobic fermentation technology was studied in this paper. The results show that the best conditions of continuous hydrogen production are: the HRT is 8 hours and the temperature of the reactor is 35°C, in which conditions, the hydrogen production rate is up to 195.6 ml/g-starch. At the same time, the starch wastewater is degraded with COD removal...
This paper researched the effect of aeration frequency on stabilizing process of the aerobic bioreactors, coded A1, A2 and A3 under the condition that the total amount of oxygen supplied by aeration was same. A1 was operated at aerating-to-break-operating ratio of 1:5, that aerating was 2 hours and intermittent operating lasted 10 hours. A2 was operated at ratio of 1:3, aerating for 2 hours and intermittent...
Membrane-making wastewater contains DMF, with high COD, toxicity and non-biodegradability. In this work, aerobic Fe-C micro-electrolysis and three-dimensional electrodes technology were applied for the pretreatment aiming to improve the biodegradability of the wastewater. It was found that the optional pretreatment conditions were pH 3 for Fe-C micro-electrolysis and pH 5 for the three-dimensional...
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...
This study investigated low temperature influence on package membrane bioreactor operation, applied in the remote mountain residential areas. During initiation, F/M ratio should be controlled above 0.05 kgCOD/kgMLSS-d by adjusting inoculated sludge concentration. Operation experienced three phases divided by temperature. Above 12degC, package MBR could keep excellent COD and NH3-N removal rate, and...
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