期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
Nitrous oxide production during nitrogen removal from domestic wastewater in lab-scale sequencing batch reactor 被引量:17
1
作者 LIU Xiuhong PENG Yi +2 位作者 WU Changyong AKIO Takigawa PENG Yongzhen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第6期641-645,共5页
The production of N2O during nitrogen removal from real domestic wastewater was investigated in a lab-scale aerobic-anoxic sequencing batch reactor with a working volume of 14 L. The results showed that the total N2O-... The production of N2O during nitrogen removal from real domestic wastewater was investigated in a lab-scale aerobic-anoxic sequencing batch reactor with a working volume of 14 L. The results showed that the total N2O-N production reached higher than 1.87 mg/L, and up to 4% of removed nitrogen was converted into N20. In addition, N20 led to a much higher greenhouse effect than CO2 during aerobic reaction phase, this proved that N2O production could not be neglected. The N2O-N production during nitrification was 1.85mg/L, whereas, during denitrification, no N2O was produced, nitrification was the main source of N2O production during nitrogen removal. Furthermore, during denitrification, the dissolved N2O at the end of aeration was found to be further reduced to N2. Denitrification thus had the potential of controlling N2O production. 展开更多
关键词 N2O domestic wastewater NITRIFICATION DENITRIFICATION
下载PDF
Production of N2O in two biologic nitrogen removal processes: a comparison between conventional and short-cut Nitrogen removal processes 被引量:2
2
作者 Youkui GONG Yongzhen PENG +1 位作者 Shuying WANG Sai WANG 《Frontiers of Environmental Science & Engineering》 SCIE EI CAS CSCD 2014年第4期589-597,共9页
The N2O production in two nitrogen removal processes treating domestic wastewater was investigated in laboratory-scale aerobic-anoxic sequencing batch reactors (SBRs). Results showed that N2O emission happened in th... The N2O production in two nitrogen removal processes treating domestic wastewater was investigated in laboratory-scale aerobic-anoxic sequencing batch reactors (SBRs). Results showed that N2O emission happened in the aerobic phase rather than in the anoxic phase. During the aerobic phase, the nitrogen conversion to N2O gas was 27.7% and 36.8% of NH+-N loss for conventional biologic N-removal process and short-cut biologic N-removal process. The dissolved N2O was reduced to N2 in the anoxic denitrification phase. The N2O production rate increased with the increasing of nitrite concentration and ceased when NH+-N oxidation was terminated. Higher nitrite accumulation resulted in higher NEO emission in the short-cut nitrogen removal process. Pulse-wise addition of 20 mg NO2 -N. L- 1 gave rise to 3-fold of N2O emission in the conventional N-removal process, while little change happened with 20 mg NOS-N L-1 was added to SBR1. 展开更多
关键词 conventional N-removal process N2O short- cut N-removal process nitrite accumulation ammonia-oxidizing bacteria (AOB) denitrification
原文传递
Thermal properties in phase change wallboard room based on air conditioning cold storage
3
作者 陈其针 刘鑫 +1 位作者 牛润萍 王琳 《Journal of Central South University》 SCIE EI CAS 2009年第S1期193-196,共4页
By comparing the thermal performance parameters of an ordinary wall room with a phase change wall (PCW) room,the effect of phase change wallboard on the fluctuation of temperature in air-conditioning room in summer wa... By comparing the thermal performance parameters of an ordinary wall room with a phase change wall (PCW) room,the effect of phase change wallboard on the fluctuation of temperature in air-conditioning room in summer was studied. And PCW room and an ordinary wall room,which are cooled by air-conditioner,were built up. Differential scanning calorimetry (DSC) was used to test the temperature field and heat flow fluctuation in these rooms. Through analyzing the data tested,it is found that the mean temperature of PCW is lower than that of ordinary wall room by 1-2 ℃,and PCW can lower the heat flow by 4.6 W/m2. Combining phase change material to building envelope can lower the indoor temperature,make the room thermal comfortable,and cut down the turn-on-and-off frequency of air-conditioner,the primary investment and operating costs. It alleviates urgent need of the electric power. Building envelope which contains phase change wallboard can improve the indoor thermal environment,and decrease energy consumption in buildings. Phase change wallboard can make impressive effect on energy efficiency of buildings. 展开更多
关键词 PHASE CHANGE energy STORAGE PHASE CHANGE WALLBOARD ROOM indoor air temperature COOL STORAGE
下载PDF
Pyrene partition behavior to the NOM:Effect of NOM characteristics and its modification by ozone preoxidation
4
作者 Jin GUO Jun MA 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2009年第1期56-61,共6页
Hydrophobic organic contaminants(HOCs)—pyrene,and natural organic matters(NOM)from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’parti... Hydrophobic organic contaminants(HOCs)—pyrene,and natural organic matters(NOM)from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’partition to the NOM in this study.The effects of solution property,NOM characteristics,and modification by ozone preoxidation on pyrene partition to NOM were systematically evaluated.According to the fluorescence quenching method,the partition coefficient K_(oc) of pyrene to NOM was calculated,which was found to have a great relationship with the aromatic structures and hydrophobic functional groups of the NOM.The NOM characteristic modification corresponding to solution property could influence the interactions between the NOM and pyrene.Preozonation could destroy the aromatic or hydrophobic structures of the NOM and decrease K_(oc) of pyrene. 展开更多
关键词 natural organic matters(NOM) PYRENE partition coefficient OZONE
原文传递
Enhancing photocatalytic performance by constructing ultrafine TiO2 nanorods/g-C3N4 nanosheets heterojunction for water treatment 被引量:16
5
作者 Shiliang Luan Dan Qu +6 位作者 Li An Wenshuai Jiang xiang Gao Shixin Hua Xiang Miao Yuanjing Wen Zaicheng Sun 《Science Bulletin》 SCIE EI CSCD 2018年第11期683-690,共8页
Photocatalysis is considered to be a clean, green and efficient method to purify water. In this report, we first developed a highly efficient ultrafine TiO2 nanorods/g-C3N4 nanosheets (TiO2 NR/CN NS) composites via ... Photocatalysis is considered to be a clean, green and efficient method to purify water. In this report, we first developed a highly efficient ultrafine TiO2 nanorods/g-C3N4 nanosheets (TiO2 NR/CN NS) composites via a simple hydrothermal method. Tiny TiO2 nanorods (diameter: ~1.5 nm and length: ~8.3 nm) were first loaded in situ on the CN NS by adding graphitic carbon nitride (g-C3N4) to the reaction solution. The TiO2 NR/CN NS composites present high charge separation efficiency and broader light absorbance than P25 TiO2. Furthermore, we illustrate that the TiO2 NR/CN NS catalyst possesses high performance for the photocatalytic degradation of the common and stubborn pollutants in water, such as the rhodamine B (RhB) dye and phenol. Under visible light (λ 〉 420 nm) irradiation, the apparent rate of the TiO2 NR/CN NR is 172 and 41 times higher than that of the P25 TiO2 and TiO2 NR, respectively. Additionally, we speculated that the heterojunction formed between TiO2 NR and CN NS, which is the basis for the experiments we have designed and the corresponding results. We demonstrated that reactive oxidative species such as superoxide anion radical and holes play critical roles in the degradation, and the hydroxyl radical contributes nothing to the degradation. 展开更多
关键词 HETEROJUNCTION Photocatalyst TiO2 nanorods g-C3N4 nanosheets Water treatment
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部