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Li Z.,Tsinghua University | Li Z.,Hebei University of Science and Technology | Zuo J.,Tsinghua University | Ju P.,Hebei University of Science and Technology | And 5 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

Fenton process was used to oxidize secondary effluent of wastewater with penicillin and oxytetracycline. An experimental design based on the orthogonal experiments and single factor experiments was applied to determine the optimal reaction conditions. The effects of operating conditions such as initial pH, hydrogen peroxide concentration, molar ratio of Fe2+/H2O2 and reaction time on COD removal were investigated. Under the most favorable conditions, the highest removal rate of 75% was observed for COD and acute toxicity (toxic equivalent of HgCl2) in final effluent was lower than 0.07 mg/L at reaction time of 60 min. In general, the best operating conditions were pH of 4, H2O2(30%) of 50 mL/L, H2O2/Fe2+ molar ratio of 20. The quality of final effluent indicated that it met the requirements of Discharge Standards of Water Pollutants for Pharmaceutical Industry Fermentation Products Category (GB21903-2008).

Zhong W.,Hebei University of Science and Technology | Li Z.,Hebei University of Science and Technology | Yang J.,Hebei University of Science and Technology | Liu C.,Hebei University of Science and Technology | And 3 more authors.
Bioresource Technology | Year: 2014

The anaerobic digestion of streptomycin bacterial residues, solutions with hazardous waste treatments and bioenergy recovery, was tested in laboratory-scale digesters at 35°C at various organic loading rates (OLRs). The methane production and biomass digestion were efficient at OLRs below 2.33gVSL-1d-1 but were deteriorated as OLR increased because of the increased total ammonia nitrogen (TAN) concentration from cell protein decay. The thermal-alkaline pretreatment with 0.10 NaOH/TS at 70°C for 2h significantly improved the digestion performance. With the thermal-alkaline pretreatment, the volumetric reactor productivity and specific methane yield of the pretreated streptomycin bacterial residue increased by 22.08-27.08% compared with those of the unpretreated streptomycin bacterial residue at an OLR of 2.33gVSL-1d-1. The volatile solid removal was 64.09%, with less accumulation of TAN and total volatile fatty acid. © 2013 Elsevier Ltd.

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