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Wei C.,Harbin Institute of Technology | He W.,Tianjin Waterworks Group Co. | Wei L.,Harbin Institute of Technology | Li C.,Harbin University of Commerce | And 2 more authors.
Desalination and Water Treatment

In this study, a laboratory-scale biodegradation, electron transfer based on sulfur metabolism integrated (BESI®) process was used on the treatment of petrochemical reverse osmosis concentrate (ROC). ROC is a type of saline wastewater with low biodegradability. In the operational days, the chemical oxygen demand (COD) and total organic carbon removal efficiencies on average were 79.18 and 79.39%, respectively. The removal efficiencies of ammonia nitrogen and total nitrogen on average were 79.84 and 83.60%, respectively. High-throughput pyrosequencing was applied on the analysis of the microbial community in activated sludge and biofilm samples. The functional phylotypes sulfate-reducing bacteria (SRB) were detected in anaerobic reactor, and they participated in the COD removal and sulfate reduction. The genera Hyphomicrobium, Azoarcus, Thauera, Paracoccus, and Nitrospira were detected in the BESI® process. These genera contributed to the nitrogen transformation, and they played different roles in each reactor of the integrated process. © 2016 Balaban Desalination Publications. All rights reserved. Source

Tan H.Q.,Harbin Institute of Technology | He W.J.,Harbin Institute of Technology | He W.J.,Tianjin Waterworks Group Co. | Han H.D.,Harbin Institute of Technology
Advanced Materials Research

Analyzing the seasonal variation of water quality, the indices which include total iron, pH, temperature, DO, alkalinity and hardness were of high statistical significance, and total iron had a high correlation with temperature, which influences many parameters influencing iron release, such as DO, solution viscosity, thermodynamic properties and microbial activity. Therefore, it can be concluded that temperature is a main factor that affects iron release in seasonal change for drinking water distribution systems. Variation in season and temperature should be paid attention to in practice of water supply. © (2014) Trans Tech Publications, Switzerland. Source

Zheng C.-Z.,Harbin Institute of Technology | Gao J.-L.,Harbin Institute of Technology | He W.-J.,Harbin Institute of Technology | He W.-J.,Tianjin Waterworks Group Co.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science)

A new leakage discharge analysis model based on fast independent component analysis (FastICA) algorithm was established in order to solve the problems of the traditional leakage discharge analysis models, such as low simulation accuracy, incapability of reflecting the uncertain relationship between leakage discharge and presssure head and so on. The model divided total water supply flow into actual consumed water flow and leakage discharge and considered them as two source signals. In the model, the total water supply flow and pressure head at the entrance were considered as two input parameters. The waveform information of two flows were obtained by separating source signals. The order of the source signals was determined by comparing the correlation coefficients. The real amplitude of leakage discharge was solved out according to the flow balance equation. Therefore, the leakage discharge was simulated in time series. For this model, the input parameters are easily getparms. It can effectively avoid the complexity of the relationship between leakage discharge and head pressure. Thus the simulation accuracy is high in the water distribution system with one entrance only. The model has been preferably applied in the node demand distribution of one water distribution network's hydraulic model. © 2016, Zhejiang University Press. All right reserved. Source

Huang T.-L.,Xian University of Architecture and Technology | Zhang G.,Xian University of Architecture and Technology | Zhang G.,University of Jinan | Guo N.,Water Authorities of Changping District | And 3 more authors.
Water Science and Technology

Pelleting flocculation blanket (PFB) process has been successfully applied to high turbidity suspensions for high efficient solid/liquid separation. In this paper, by using the PFB process, a dynamic experimental study was carried out on concentrating ferric flocs sludge with a scale of 1.3-5.4m3/h. The pilot experiment aimed to optimize the conditioning system and determine the operational parameters. Under the raw sludge concentrations of 103-1,154 mg/L, the system could achieve ideal conditioning effect with polyacrylamide (PAM) dosages of 0.3-2.7 mg/L, agitation speed of 10 rpm, and water up-flow rates of 18-48 m/h. Under the experimental conditions, the increase of polymer dosage would improve effluent turbidity and pellets settling behaviour, the moderate up-flow rate had no marked effect on treatment results, while too large surface loading could worsen effluent turbidity. The experimental results also revealed that there existed an approximately linear relationship between the raw sludge concentration and optimum PAM dosage, that is, the optimum dosage of PAM increased synchronously as the raw sludge concentration increased. While the relationship between the raw sludge concentration and maximum up-flow rate reflected another linear dependence, namely, the maximum up-flow rate would decreased linearly as the raw sludge concentration increased. © IWA Publishing 2010. Source

Zhang G.,Xian University of Architecture and Technology | Zhang G.,University of Jinan | Huang T.-L.,Xian University of Architecture and Technology | Tan C.,Xian University of Architecture and Technology | And 4 more authors.
Water Science and Technology

Pellet flocs' settling velocity is an important parameter in the pelleting flocculation blanket (PFB) process, hence, it is necessary to investigate flocs' settling behaviour to achieve the optimum operation parameters of the process. To investigate the settling behaviour of pellets under different operational conditions, a dynamic experiment was carried out to concentrate ferric flocs sludge by pelleting flocculation blanket (PFB) process with the scale of 0.5-1.2 m3/h. Under different operating conditions such as raw water concentration, polyacrylamide (PAM) dosage, up-flow rate, and agitation speed, pellet particles were sampled from different locations of the blanket in various operating stages to analyze pellet size, setting velocity, and porosity. Experimental results indicated that, when the PAM dosage increased from 0.59 mg/L to 1.18 mg/L, pellets size would flocculated from 2.25mm to 3.52 mm with the settling velocity accelerated from 3.28 mm/s to 7.37 mm/s, while under the same up-flow rate, agitation intensity and PAM dosage, accompany with the raw water concentration increased from 216 mg/L to 840 mg/L, pellets settling velocity would improved from 6.03mm/s to 13.6 mm/s. Under the experimental condition, along with the up-flow rate increased from 13.3 m/h to 40 m/h, pellets settling velocity would decreased from 4.39 mm/s to 3.42 mm/s due to its lower density. © IWA Publishing 2010. Source

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