A single-chambered and double-chambered microbial fuel cell (MFC) with refinery oil wastewater as its fuel was constructed respectively to investigate the feasibility of electricity generation and oil pollutants degradation using microbial fuel cell. Results indicated that the refinery oil waste water could be used as fuel in MFCs to generate electricity, the oil pollutants could be degraded by MFCs and the efficiency of double-chambered MFC was better; the main composition of pollutants in the solution influx and effluent of MFCs was changed and processes which were similar to anaerobic fermentation were proceeded.
This document discussed a biofilter packing with complex filler, which was inoculated by a kind of toluene-degrading microorganism. The toluene-degrading microorganism(JBJ-3), which was isolated from activated sludge from a wastewater treatment plant of refinery, was classified as Pseudomonas sp. initially by physiological and biochemical tests. The removal efficiency of JBJ-3 reached to 93.73% for 48h. Complex filler consisted of wood chip, peat and compost etc. It has high amounts of organic matter, high specific surface area, good water holding capacity, good permeability, varied microbial system, and contains intrinsic nutrients. The complex filler could inoculate Pseudomonas sp. JBJ-3 well. And under the different inlet concentrations of toluene, the overall removal efficiency had reached above 92%. And the biofilter packing complex filler showed a good resistance to shock load.
A combined process of flocculation and Fenton oxidation was studied for the treatment of polymerization effluents (PME) from the manufacture of dry-spun acrylic fibers. 5 inorganic and 3 organic flocculants were investigated and the optimal regents and conditons were PAC (at 25°C, pH=8 and a dosage of 150 mg/L), and Z7650 (at 25°C, pH=6 and a dosage of 10 mg/L). Under this condition, the COD was removed by 23.1% of the initial 1824 mg/L. The optimum efficiency of Fenton process was determined at 25°C and pH=4 with a reaction time of 90 min. The dosage of H2O2 and the rate of c(H2O2)/c(FeSO4) were respectively 0.53 mol/L and 20:1. Finally, the removal of COD, total nitrogen, ammonia, SO32- and turbidity by the combined process were 64.0%, 99.3%, 99.6%, 99.7% and 89.4% respectively. BOD/COD was also improved from 0.09 to 0.25.
A double-chambered microbial fuel cell (MFC) was constructed to investigate the feasibility of electricity generation using microbial fuel cell with refinery oil wastewater as its fuel and the influence of cathodal performance. Results indicated that refinery oil wastewater could be used as fuel in MFCs to generate electricity; catholyte type could influence the electricity generation of MFCs directly and Fe (Ⅲ)-EDTA was the best choice, voltage generation and stable operational period of which were highest and longest; voltage generation increased following with catholyte concentration linear but had little relation to cathode areas.
Spinning effluents (SE) from dry-spun acrylic fiber manufacturing are hard to degrade due to the containing of vast dimethyl formamide (DMF). Activated carbon, ion exchange and Fenton oxidation were applied to solve this problem. Coconut-shell-based activated carbon exhibited a better performance than the coal-based and nut-shell-based ones did. At the optimal dosage of 1g/L, pH=6 and 30 °C, the removal of COD and DMF were respectively 84.39% and 66.14%. Ion exchange resins are rated as NKA-9 > D301R > D201 > 201×7 respected to the performance, and the optimum COD and DMF removal were 82.31% and 68.76% at the NKA-9 dosage of 0.22 g, pH=7 and 30°C. The most appropriate treatment process appeared to be Fenton. COD and DMF were finally reduced to 23.29 mg/L and 23.43 mg/L, with removal rates of 90.23% and 79.43% respectively. This optimum efficiency was obtained at c(H2O2)/c(Fe2+) of 14:1, pH=3, 50 °C, and an oxidation time of 3 h.
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