Pilot Study on Drinking Water Advanced Treatment by GAC-MF System

The pilot pedomance of the combined GAC-MF membrane process for drinking water advanced treatment was described. In the process of GAC adsorption, under the conditions of 20min HRT and 6 m/h filtration rate, the removal efficiencies of UV254 and trichloromethane could reach 40% and 50% respectively and the UV254 and trichloromethane in system effluent was less than 0.015cm^-1 and 5 μg/L respectively. Inthe post MF membrane process, MF membrane effectively retained the particles and bacteria in raw water. The effluentturbidity was less than 0.2 NTU and no bacteria were detectedat all in permeate. A computer-controlled system was employedto control this system. The mcmlrane operating parameters of backwash interval, dtration and flux were studied. The backwash interval of 10-min, 20-min and 60-min wasresearched respectively, and the variation of trans-membrane pressure was also analyzed. Comequently short backwash interval was recommended under the same water consume.     

Pilot Study on Nanofiltration Combined with Ozonation and GAC for Advanced Drinking Water Treatment

IntroductionThe conventional process for surface water treatment,which consists of flocculation, sedimentation and filtrationcurrently, had been applied inproducingdrinkingwater formany years. Although this process can remove turbidityand bacteria in surface water effectively, only about from20% to 30% of natural organic matter ( NOM) can beeliminated. When the purified water is disinfected bychlorination, these NOMs may react with chlorine. As aresult some dis…     

Kinetics of Chlorine Decay in Water Distribution Systems

A combined first and second-order model, which includes bulk decay and wall decay, was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC), the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.     

Isolation and Identification of Phosphate-accumulating Strain PAO3-1 and Its Phosphorus Removal Characteristics

A phosphate-accumulating bacteria strain PAO3-1 was isolated from biological phosphorus removal sludge supplied with sodium acetate as carbon source under stable performance. This strain has good enhanced biological phosphorus removal effect on normal activated sludge system. Phosphorus removal ratio was raised form 44%with no added strain to more than 82% with strain strengthening biological phosphorus removal. It is identified to be AlcaUgenes sp. according to its morphology,biochemical characteristics and 16S rDNA sequence analysis. The cell of strain PAO3-1 is straight bacilli form, 0.4×1.1 μm, no flagellum, gram negative and special aerobiotic. The optimal temperature and pH for growth are 32℃-37℃ and 5.5-9.5, respectively. The shape of slant clone is feathery. The phosphate situation, which was 76. 5% higher than that in non-starving situation. Its phosphate release rate of log course in anaerobic phase and in culture without phosphorus was lower than that in log course.     

臭氧活性炭、纳滤联用制取优质饮用水的中试研究--纳滤优化运行研究

以臭氧活性炭、纳滤联用制取优质饮用水时，纳滤的优化运行是整个工艺能否正常运行的关键所在。针对这一问题，研究了工艺中纳滤膜通量、回收率等重要参数特性，分析了纳滤膜污染和劣化因素及控制措施，为工程应用提供了依据。     

生物炭强化污废水脱氮研究进展

为进一步探究生物炭作为具有丰富官能团的多孔材料对水中无机氮素的去除性能，从物化脱氮和生物脱氮两方面分析了生物炭强化物化吸附脱氮的原料、制备方法、官能团等影响因素，并总结了生物炭的含氧官能团和导电的石墨层结构，以及其独特的氧化还原特性。将生物炭作为污废水生物脱氮的电子供体及电子介导，从加速电子传递速率、优化群落结构、提升基因丰度酶活性和促进N₂O温室气体减排4方面详述生物炭电子介导强化生物脱氮过程。研究可为生物炭强化脱氮的应用和研究提供指导意义。     

低温地表水高效除浊工艺

采用无机高分子混凝剂聚合氯化铝铁（PAFC）,并结合管式微涡混合器、网格反应池、小间距斜板沉淀池、快滤池组合而成的一体化净水装置,对北方地区低温地表水的除浊进行试验研究.试验结果表明,当混合时间为3s,PAFC投药量为60mg/L,反应时间10min,沉淀池上升流速高达3.5mm/s时,低温低浊及高浊地表水经本工艺净化后,水浊度依然小于2NTU,并可降低工艺投资及运行费用,具有明显的经济效益.     

接触氧化法除地下水铁锰时不同滤料性能的对比研究

在地下水接触氧化法除铁除锰过程中，分别对比了石英砂、优质锰砂及纤维球3种不同性能的滤料的除铁除锰效果及滤速、反冲洗强度及运行周期等运行参数。研究结果表明，纤维球和石英砂滤料均能除铁，但不能除锰，纤维球软性滤料用于除铁具有滤速高，运行周期长，反冲洗强度及水耗小、耐磨损等优点；优质锰砂滤料去除铁锰效果均较好，适用于铁锰共存水质。     

Removing Iron and Manganese Simultaneously from Ground Water Using One-stage Biological Filter

A novel process for removing iron and manganese simultaneously in ground water,which consisted of simple aeration and one-stage filtration,was developed in this research. It was found that the biological process had much higher manganese removal efficiency than chemical contact oxidation process. At the same time,the optimal operation parameters of aeration and biological filtration such as DO concentration and pH after aeration,filtration rate before and after startup,filtration operation cycle and backwas...     

Adsorption of Phenol by Activated Carbon Prepared from Waste Rice Straw by Chemical Activation with （ NH4 ） 2 HPO4

Activated carbons,RS-1,RS-2,and RS-3,prepared from rice straw with (NH4 )2HPO4 activation were used as adsorbents for removing phenols from aqueous solutions. The maximum adsorption capadties of phenol...