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111.
垃圾渗滤液电化学催化氧化法深度处理研究 总被引:4,自引:0,他引:4
研究利用电化学催化氧化法深度处理经生物处理后的垃圾渗滤液时,电压、氧化时间、氯离子浓度及温度对有机物降解的影响。试验结果表明:在电压3.5V,电流密度为7.0mA/cm^2.氧化时间2.5h.氯离子的浓度2000mg/L的条件下,垃圾渗滤液的CODCr由464.0mg/L降低到200.0mg/L,NH3^-N的去除率大于95%。 相似文献
112.
Hua Li Lin Cao Rong Sun Wenyi Dong Hongjie Wang Zhongyi Dai Xue Wang Jin Xie 《环境科学学报(英文版)》2023,35(2):758-768
To achieve advanced nitrogen removal from actual municipal sewage, a novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) was developed. The reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone (R zone) was investigated during the long-term operation. The best performance was obtained at the R zone's Oxidation-Reduction Potential (ORP) of -50±30 mV and hydraulic residence times (HRT) of 1.2 hr. The average effluent COD, TN, NH4+-N and NO3−-N of the R-MAO process were 18.0±2.3, 7.5±0.6, 1.0±0.5 and 4.6±0.4 mg/L, respectively, with the corresponding removal efficiency of COD, TN and NH4+-N were 92.9%±1.0%, 84.1%±1.5% and 97.5%±1.1%. Compared to the sole MAO system, the TN removal efficiency of the R-MAO increased by 10.1%. Besides, under the optimal conditions, the contribution of the R zone in the R-MAO that removal COD, TN, NH4+-N and NO3−-N were 0.36, 0.15, 0.032 and 0.82 g/day. High-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae (5.20%), OLB8 (1.04%) and Ottowia (1.03%) played an important role in denitrification in the R zone. This study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment. 相似文献
113.
A nitrogen-doped titanium dioxide composite photocatalyst(N–TiO_2) with heterojunction structures is synthesized by three different approaches: a novel UV-assisted thermal synthesis, annealing, and microwave technique. Photocatalytic activities of synthesized photocatalysts are evaluated by the degradation of Methyl Orange under ultraviolet light types A(UV-A), B(UV-B), and C(UV-C), visible light, and direct sunlight irradiation. Results show that by using N–TiO_2 photocatalyst prepared by the UV-assisted thermal synthesis and annealing, the degradation increases by 16.5% and 20.4%, respectively, compared to that by bare TiO_2. The best results are obtained at a nitrogen to TiO_2 mass ratio of 0.15(N:TiO_2). The enhancement of the photocatalytic activity observed in the visible range is mainly attributed to the increasing separation rate of photogenerated charge carriers. The novel UV-assisted thermal synthesis has produced encouraging results as a preparation method for the nitrogen-doped TiO_2 photocatalyst; thus, further studies are recommended for process optimization, immobilization, and scale-up to evaluate its applicability in wastewater treatment. 相似文献
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Masahiro Tokumura Yuko WadaYuri Usami Takako YamakiAtsushi Mizukoshi Miyuki NoguchiYukio Yanagisawa 《Chemosphere》2012,89(10):1238-1242
The photo-Fenton reaction was applied as a novel method for the removal of volatile organic compounds (VOCs) in the gas phase, and its effectiveness was experimentally examined. In conventional VOCs removal methods using a photocatalyst or ozone, VOCs are oxidized in the gas phase. Therefore, incompletely oxidized intermediates, which may have adverse effects on health, are likely to contaminate the treated air. On the other hand, in the VOCs removal method developed in this study, because the VOCs are oxidized in the liquid phase by the photo-Fenton reaction, any incompletely oxidized intermediates produced are confined to the liquid phase. As a result, the contamination of the treated air by these harmful intermediates can be prevented. Using a semi-batch process, it was found that the removal efficiency for toluene in a one-pass test (residence time of 17 s) was 61%, for an inlet toluene gas concentration of 930 ppbv, an initial iron ion concentration of 20 mg L−1, and an initial hydrogen peroxide concentration of 630 mg L−1. The removal efficiency was almost constant as long as H2O2 was present in the solution. Proton transfer reaction mass spectrometry analysis confirmed the absence of any incompletely oxidized intermediates in the treated air. 相似文献
117.
Overland flow (OF) systems were evaluated and compared for advanced treatment of municipal and industrial effluents, including nutrients and nondegradable chemical oxygen demand (COD) removal. Three pilot plants were constructed at the Shahin Shahr Wastewater Treatment Plant (WWTP), Isfahan, Iran. Each pilot was assigned a specific wastewater and all were simultaneously operated for 8 months. Treatment of primary effluent, activated sludge secondary effluent, and lagoon effluent of textile wastewater was investigated at application rates (ARs) of 0.15, 0.25, and 0.35m(3)m(-1)h(-1). During 5 months of stable operation after a 3-month acclimation period, mean removals of total 5-day biochemical oxygen demand (TBOD(5)), total COD (TCOD), total suspended solids (TSS), total nitrogen (TN), total phosphorus (TP) and turbidity were 74.5%, 54.8%, 66.2%, 39.4%, 35.8%, and 67.7% for primary effluent; 52.9%, 52.9%, 66.5%, 44.4%, 39.8%, and 50.1% for activated sludge effluent; 65.7%, 58.7%, 70.3%, 41.7%, 41.3%, and 54.9% for textile wastewater lagoon effluent, respectively. The model of Smith and Schroeder, 1985. Field studies of the overland flow process for the treatment of raw and primary treated municipal wastewater. Journal of Water Pollution Control Federation 57, 785-794] was satisfactory for TBOD(5). For all treatment parameters a standard first-order removal model was inadequate to represent the data but a modified first-order model provided a satisfactory fit to the data. Based on the results of this study, it can be concluded that an OF system as advanced treatment had the ability to meet effluent discharge permit limits and was an economical replacement for stabilization ponds and mechanical treatment options. 相似文献
118.
本文重点针对高级氧化技术处理抗生素废水的具体研究成果进行了分析和研究,采用了光催化、氧化法、电化学氧化法等相关方法来对抗生素废水进行处理,对各种处理方法存在的优缺点进行了分析和阐述,对抗生素废水的处理效果非常明显。 相似文献
119.
现阶段,我国经济仍保持着良好的发展势头,而在此发展过程中,也出现了更多的化工企业,化工园区数量也有所增加。因此,也相应增加了化工污水排放量,加剧了对环境的污染,加大了污水处理的难度。所以,当前做好污水处理工艺的选择及可行性分析显得愈加重要。本文从笔者工作经验出发,对污水深度处理工艺的选择及可行性分析展开了着重探讨。 相似文献
120.
Alejandro Moncayo-Lasso Janeth Sanabria Csar Pulgarin Norberto Benítez 《Chemosphere》2009,77(2):296-300
Bacteria inactivation and natural organic matter oxidation in river water was simultaneously conducted via photo-Fenton reaction at “natural” pH (6.5) containing 0.6 mg L−1 of Fe3+ and 10 mg L−1 of H2O2. The experiments were carried out by using a solar compound parabolic collector on river water previously filtered by a slow sand filtration system and voluntarily spiked with Escherichia coli. Fifty five percent of 5.3 mg L−1 of dissolved organic carbon was mineralized whereas total disinfection was observed without re-growth after 24 h in the dark. 相似文献