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序批式MBBR处理低C/N生活污水 被引量:5
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作者 魏海娟 张永祥 +1 位作者 张粲 蒋源 《工业水处理》 CAS CSCD 北大核心 2009年第3期46-49,共4页
通过序批式移动床生物膜反应器(MBBR)处理低COD/TN(C/N)生活污水的试验研究,探讨了载体填充率、曝气量对处理效果的影响,确定适合反应器的填充率为53%,最佳曝气量为0.07 L/h。在该实验条件下,COD平均去除率为87%左右,氨氮去除率均在93%... 通过序批式移动床生物膜反应器(MBBR)处理低COD/TN(C/N)生活污水的试验研究,探讨了载体填充率、曝气量对处理效果的影响,确定适合反应器的填充率为53%,最佳曝气量为0.07 L/h。在该实验条件下,COD平均去除率为87%左右,氨氮去除率均在93%以上,TN去除率最高为65%,发生了同时硝化反硝化现象,结果表明:反应器对低C/N生活污水有较好的处理效果。 展开更多
关键词 MBBR 生活污水 低C/N
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盐城市某原水预处理厂设计与运行分析 被引量:6
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作者 王毅 井添祺 +3 位作者 周家中 万兰庆 吴迪 杨华仙 《净水技术》 CAS 2020年第7期24-29,34,共7页
江苏省盐城市某原水预处理厂总处理规模为30万m^3/d,要求出水达到《地表水环境质量标准》(GB 3838—2002)Ⅲ类水体要求。综合进出水水质、投资占地等,经充分经济论证和方案比选,采用“高锰酸钾预氧化+MBBR生化法+中置式高密度沉淀池”... 江苏省盐城市某原水预处理厂总处理规模为30万m^3/d,要求出水达到《地表水环境质量标准》(GB 3838—2002)Ⅲ类水体要求。综合进出水水质、投资占地等,经充分经济论证和方案比选,采用“高锰酸钾预氧化+MBBR生化法+中置式高密度沉淀池”组合工艺对原水进行强化处理。核心生化段采用纯膜MBBR工艺,设6级硝化,气水比设计为0.6~1.3。实际运行结果表明,各出水水质稳定达到地表水Ⅲ类标准,其中,氨氮最低可达0.1 mg/L。对悬浮载体进行高通量测序,结果显示,其对硝化菌具有良好的富集能力,低基质条件下,硝化菌相对丰度可达2.36%,强化了氨氮的去除。经过中置式高密度沉淀池的强化,保障了COD和TP的稳定达标。全厂电耗为0.052 kW·h/t。该工艺路线操作简单,运行成本低,后期维护少,适用于微污染原水的治理。 展开更多
关键词 微污染原水 预处理 地表水Ⅲ类标准 移动床生物膜反应器(MBBR) 中置式高密度沉淀池
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Biological pretreatment of Yellow River water
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作者 XIEShu-guang TANGXiao-yan +2 位作者 WUWei-zhong WENDong-hui WANGZhan-sheng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2005年第4期557-561,共5页
Bio-ceramic filter(BF) and moving-bed biofilm reactor(MBBR) were used for biological pretreatment of Yellow River water in this study. The BF only had slight advantage over MBBR for TOC and ammonia removal. However, l... Bio-ceramic filter(BF) and moving-bed biofilm reactor(MBBR) were used for biological pretreatment of Yellow River water in this study. The BF only had slight advantage over MBBR for TOC and ammonia removal. However, like UV_ 254 , the average removal rate of THMFP in the BF was much higher than that in the MBBR. UV_ 254 removal did not show obvious correlation with trihalomethane formation potential(THMFP) removal. Hexachlorocyclohexane could be effectively removed in both BF and MBBR. As for diatom and cyanobateria removal the MBBR had better performance than the BF, which was contrary to the average chlorophyll-a(Chl-a) removal rate. The proposal was made in this study that biological flocculation and sedimentation of sloughed biofilm should play a more important role on algae removal in the MBBR than in the BF. The BF and MBBR could effectively remove microcystins. Moreover, MBBR could be a promising technology for biological pretreatment. 展开更多
关键词 bio-ceramic filter(BF) moving-bed biofilm reactor(MBBR) Yellow River biological pretreatment
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Industrial Feasiblity of Direct Methane Conversion to Hydrocarbons over Fe-Based Fischer Tropsch Catalyst
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作者 Ademola M. Rabiu Isa M. Yusuf 《Journal of Power and Energy Engineering》 2013年第5期41-46,共6页
Recently, as a direct consequence of the dwindling world oil reserves and the growing awareness of the environmental problems associated with the use of coal as energy source, there is growing interest in cheaper, abu... Recently, as a direct consequence of the dwindling world oil reserves and the growing awareness of the environmental problems associated with the use of coal as energy source, there is growing interest in cheaper, abundant and cleaner burning methane. The Gas-to-Liquid technology offers perhaps the most attractive routes for the exploitation of the world huge and growing natural gas resources. Using this process the erstwhile stranded gas is converted to premium grade liquid fuels and chemicals that are easily transported. However, a widespread application of the GTL process is being hampered by economical and technical challenges. The high cost of synthesis gas, for instance, weighs heavily on the economics and competitiveness of the process limiting its wider application. This work presented a modified Gas-to-Liquid process that eliminates the costly synthesis gas production step. The proposed process utilized an alternative pathway for methane activation via the production of chloromethane derivatives which are then converted to hydrocarbons. It established that hydrocarbons mainly olefins can be economically produced from di- and tri-chloro- methanes over a typical iron-based Fischer Tropsch catalysts in a moving bed reactor at industrially relevant conditions. Some of the attractions of the proposed process include a) the elimination of the costly air separation plant requirement b) high process selectivity and c) significant reduction of carbon dioxide emissions thereby saving on feedstock loss and the costly CO2 removal and isolation processes. 展开更多
关键词 Gas-to-Liquid Methane CHLORINATION Synthesis Gas Olefinic Hydrocarbons IRON-BASED CATALYST moving-bed reactor Deacon Process Carbon-Dioxide Emission
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Modification of nitrifying biofilm into nitritating one by combination of increased free ammonia concentrations, lowered HRT and dissolved oxygen concentration 被引量:13
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作者 Ivar Zekker Ergo Rikmann +5 位作者 Toomas Tenno Anne Menert Vallo Lemmiksoo Alar Saluste Taavo Tenno Martin Tomingas 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第7期1113-1121,共9页
Nitrifying biomass on ring-shaped carriers was modified to nitritating one in a relatively short period of time (37 days) by limiting the air supply, changing the aeration regime, shortening the hydraulic retention ... Nitrifying biomass on ring-shaped carriers was modified to nitritating one in a relatively short period of time (37 days) by limiting the air supply, changing the aeration regime, shortening the hydraulic retention time and increasing free ammonia (FA) concentration in the moving-bed biofilm reactor (MBBR). The most efficient strategy for the development and maintenance of nitritating biofilm was found to be the inhibition of nitrifying activity by higher FA concentrations (up to 6.5 mg/L) in the process. Reject water from sludge treatment from the Tallinn Wastewater Treatment Plant was used as substrate in the MBBR. The performance of high-surfaced biocarriers taken from the nitritating activity MBBR was further studied in batch tests to investigate nitritation and nitrification kinetics with various FA concentrations and temperatures. The maximum nitrite accumulation ratio (96.6%) expressed as the percentage of NO 2 ? -N/NOx ? -N was achieved for FA concentration of 70 mg/L at 36°C. Under the same conditions the specific nitrite oxidation rate achieved was 30 times lower than the specific nitrite formation rate. It was demonstrated that in the biofilm system, inhibition by FA combined with the optimization of the main control parameters is a good strategy to achieve nitritating activity and suppress nitrification. 展开更多
关键词 moving-bed biofilm reactor free ammonia specific nitrite oxidation rate nitrite accumulation ratio
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