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Flux enhancement during ultrafiltration of produced water using turbulence promoter

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Journal of environmental Sciences 2006年第6期18卷 1077-1081页

作者： ZHEN Xiang-hua YU Shui-li WANG Bei-fu ZHENG Hai-feng School of municipal and environmental engineering Harbin Institute of Technology Harbin 150090 China

Concentration polarization and membrane fouling remain one of the major hurdles for the implementation of ultrafiltration of produced water. Although many applications for ultrafiltration were already suggested, only few were implemented on an industrial scale. Among those techniques, turbulence promoter can be more simple and effective in overcoming membrane fouling and enhancing membrane flux. As for the result that turbulence promoter increase fluid velocity, wall shear rates and produce secondary flows or instabilities, the influence of turbulence promoter was investigated on permeate flux during produced water ultrafiltration and the potential application of this arrangement for an industrial development. Experimental investigations were performed on 100 KDa molecular weight cut-off PVDF single-channel tubular membrane module using four kinds of turbulence promoters. It is observed that the significant flux enhancement in the range of 83%--164% was achieved while the hydraulic dissipated power per unit volume of permeate decreased from 31%--42%, which indicated that the using of turbulence promoter is more efficient than operation without the turbulence promoter. The effects of transmembrane pressure and cross-flow velocity with and without turbulence promoter were studied as well. Among the four kinds of turbulence promoters, winding inserts with 20.0 mm pitch and 1.0 mm wire diameter showed better performances than the others did.

关键词： hydraulic dissipated power flux enhancement turbulence promoter produced water ultrafiltration

Resource utilization of drinking water treatment aluminum sludge in green cementing materials: Hydration characteristics and hydration kinetics

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Journal of environmental Sciences 2024年第10期144卷 236-248页

作者： Jing Yang Cheng Chen Shuoyu Chen Yujie Ren Jinsuo Lu School of environmental and municipal engineering Xi’an University of Architecture and TechnologyXi’an 710055China

As a byproduct of water treatment,drinking water treatment aluminum sludge(DWTAS)has challenges related to imperfect treatment and disposal,which has caused potential harm to human health and the *** this paper,heat treatment DWTAS as a supplement cementitious material was used to prepare a green cementing *** results show that the 800℃ is considered as the optimum heat treatment temperature for ***-800℃ is fully activated after thermal decomposition to form incompletely crystallized highly activeγ-Al_(2)O_(3) and active SiO_(2).The addition of DWTAS promoted the formation of ettringite and C-(A)-S-H gel,which could make up for the low early compressive strength of cementing materials to a certain *** cured for 90 days,the compressive strength of the mortar with 30% DWTAS-800℃ reached 44.86 *** dynamic process was well simulated by Krstulovi′c-Dabi′c hydration kinetics *** study provided a methodology for the fabrication of environmentally friendly and cost-effective compound cementitiousmaterials and proposed a“waste-to-resource”strategy for the sustainable management of typical solid wastes.

关键词： Drinking water treatment aluminum sludge Green cementing material Hydration characteristics Hydration kinetics

Modified two-phase anaerobic baffled process for low-concentration wastewater treatment

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Journal of Harbin Institute of Technology(New Series) 2009年第3期16卷 326-330页

作者：林英姿韩相奎尹军邵丕红艾胜书 School of municipal and environmental engineering Harbin Institute of Technology dept. of environmental engineering Jilin Architectural and Civil Engineering Institute Department of environmental engineering Changchun Engineering Institute

In this study low-concentration wastewater was investigated in the integral two-phase anaerobic baffled reactor by determining the removal of COD at various HRT,reflex ratios,and temperatures. Results indicate that the removal efficiency of COD is more than 90% at 25 ℃ and 10-h HRT with no wastewater recycled,and the removal efficiency is up to 88% at 8-h HRT and reflex ratio of 150%. The removal efficiency is decreased with the decreasing temperature and HRT. The removal efficiency of COD is approximately 60% at 10 ℃,which proves that the temperature does not affect it apparently. This research has significance for reducing the cost of wastewater and sludge treatment in cold area.

关键词： hydrolytic acidification reflex ratio HRT temperature

Structure and formation of anoxic granular sludge A string-bag hypothesis

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Frontiers of environmental Science & engineering 2016年第2期10卷 311-318页

作者： Binbin WANG Dangcong PENC Xinyan ZHANG Xiaochang WANG School of environmental and municipal engineering Xi'an University of Architecture and Technology Xi'an 710055 China

Anoxic granular sludge was developed in a laboratory-scale sequencing batch reactor which was fed with sodium acetate and sodium nitrate as electron donor and accepter. The sludge in the reactor was almost granulated after approximately 90 days of cultivation. In the present study, a detailed examination of surface morphology and internal structure of anoxic granular sludge was conducted using scanning electron microscope. It showed that the bacteria inside the granules had a uniform, coccus-like shape. By contrast, filamentous bacteria were predominant outside the granules. These bacteria were woven and had wrapped the coccus bacteria together to form granules. The small amounts of DO in the liquid bulk promoted the growth of filamentous bacteria on the surface of the granules. A string-bag hypothesis was proposed to elucidate the structure and formation of the anoxic granular sludge. It suggested that micro-aeration could be a method to promote granulation in practical anoxic treatment systems.

关键词： granulation sequencing batch reactor anoxicsludge scanning electron microscope filamentous bacteria

Solidification/stabilization of Dewatered Sludge with Multi-Component Solidifying Agents

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Journal of Harbin Institute of Technology(New Series) 2013年第6期20卷 46-52页

作者： Jun-Qiu Jiang Kun Wang Zi-Ye Li Yang Li Qing-Liang Zhao Guang-Yi Liu Department of municipal and environmental & engineering Harbin Institute of Technology Southwest municipal engineering Design & Research Institute of China

This work experimentally examined the optimal proportioning of sludge curing agent for dewatered sludge curing on solidified sludge,two components sludge curing agent consisted of cement and slag,and three components consisted of cement,slag and inorganic salt. The results showed that,increasing of curing ages could increase unconfined compressive strength and reduce moisture content for solidified sludge. For the test of two components,the biggest unconfined compressive strength of the solidified sludge achieved to 543. 72 kPa and the minimum moisture content achieved to 3. 56% of 21 d. The optimum proportion of the sludge curing agent of two components is sludge: cement: slag = 1 ∶ 0. 05 ∶ 0. 2 which selected by Design-expert. It could rapidly increasing the unconfined compressive strength of solidified sludge when added three components sludge curing agent( sludge: cement: slag: MgSO4= 1 ∶ 0. 05 ∶ 0. 2 ∶ 0. 03) on sludge curing. The results showed that,curing ages of 7 d,the unconfined compressive strength could achieve to 126. 74 kPa,which was more than 11 times comparison with the solidified sludge curing by two components curing agent. Two or three components sludge curing agent all could stabilize the heavy metals on solidified sludge and the leaching of heavy metals was below the government standard,while the stability of the heavy metals was superior for three components sludge curing agent.

关键词： dewatered sludge solidification curing agent stabilizationCLC number:X705 Document code:AArticle ID:1005-9113(2013)06-0046-07

UV-TiO_2 photocatalytic disinfection and photoreactivation of pathogenic bacterium in municipal wastewater

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Journal of Central South University 2016年第12期23卷 3115-3121页

作者：王西峰胡晓莲龚昕班云霄 School of Civil engineering Hunan University of Science and Technology School of environmental and municipal engineering Lanzhou Jiaotong University

The disinfected bacteria will be a photoreactivation under the irradiation of the sunlight,and the light intensity plays an important role in the bacteria *** effect of light intensity on photoreactivation of Escherichia coli(***) and Enterococcus faecalis(***) in secondary effluents which were disinfected respectively by pure UV and UV-TiO_2 was *** results show that the disinfection efficiency of UV-TiO_2 is much higher than that of the pure UV *** photoreactivation rate of *** is much higher in pure UV disinfection than in UV-TiO_2 photocatalytic *** high light intensity in UV-TiO_2 disinfection,high resurrection rate can be ***,a higher resurrection rate can be introduced even under low light intensity in pure UV disinfection ***,UV-TiO_2 disinfection has a strong inhibition effect on *** *** the light intensity is lower than 21 μW/cm^2,nearly no resurrection of *** occurs after 72 h resurrection irradiation,and a little resurrection rate is observed only under a strong photoreactivating light intensity.

关键词： pathogenic bacteria inactivate UV-TiO2 disinfection photoreactivation Escherichia coli (E. coli) Enterococcusfaecalis (E. facialis)

Purification of Songhua River water with an integrated O_3 /AC-GAC process

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Journal of Harbin Institute of Technology(New Series) 2010年第4期17卷 558-563页

作者：关春雨马军刘桂芳隋铭皓 School of municipal and environmental engineering Harbin Institute of Technology School of environmental Science and engineering Tongji University

Catalytic ozonation with coal-based activated carbon ( carbozone) followed by GAC ( granular activated carbon) filtration was compared with ozone-GAC process for water purification. Songhua River water pretreated with traditional processes was used as influent in the continuous-flow experiments. The carbozone-GAC process performed better than the ozone-GAC process during the 9. 5-months operation period. The organic removal rate in carbozone was found to be very high in the initial operation period,and then gradually decreased to a steady level. At the steady state of operation,the average removal rates of permanganate index ( PI) and UV254 were 25. 8% and 67. 8% in carbozone,and 6. 6% and 53. 7% in ozonation alone,respectively. The carbozone process also achieved a higher DOC removal than ozonation alone,and moreover,the number of semi-volatile organic compounds detected with GC/MS decreased from 44 to 28 in carbozone and 34 in ozonation alone,respectively. The catalyst surface became more acidic during the long-term operation with its pHPZC( pH at which its surface is zero charged) decreased from 7. 0 to 6. 2. In addition,the physical characteristics of the catalyst were also changed during the operation.

关键词： activated carbon catalytic ozonation GAC organic matter

Mechanism study of electrochemical oxidation in the terylene diaphragm cell

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Journal of environmental Sciences 2006年第1期18卷 33-39页

作者： YU Xiu-juan WANG Hui SUN De-zhi SONG Lai-wen WU Lan Department of environmental Science and engineering Heilongjiang University Harbin 150086 China School of municipal and environmental engineering Harbin Institute of Technology Harbin 150090 China

By using a self-made carbon/polytetrafluoroethylene （C/PTFE） O2-fed as cathode and Ti/IrO2/RuO2 as anode, the effects of electrochemical oxidation of phenol and the coal-gas wastewater containing phenol were studied. The terylene diaphragm which kept pH〉12 in cathodic compartment and pH〈1 in the anodic compartment was selected in the experiment in comparison with the other types of diaphragm. Furthermore, hydroxyl radical （HO·） was determined in the cathodic compartment of the diaphragm cell by electron spin resonance spectrum（ESR） and the fluorescence spectra. Compared with pH, the accumulated HzO2 and the COD removal of the no-diaphragm cell, the mechanism of electrochemical oxidation in the terylene diaphragm cell was supposed. The degradation of phenol was supposed to be cooperative oxidation by direct or indirect electrochemical oxidation at the anode and H2O2, HO· produced by oxygen reduction at the cathode. The mineralization of phenol in the diaphragm cell was better than that in the no-diaphragm cell. When the coal-gas wastewater was treated by the electrolysis system with terylene diaphragm, the average removal efficiency of the volatile phenol and COD were 100% and 79.6%, respectively.

关键词： electrochemical oxidation C/PTFE O2-fed cathode terylene diaphragm hydroxyl radical

Performance of BAC process for treatment of micro-polluted water

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Journal of Harbin Institute of Technology(New Series) 2008年第2期15卷 194-197页

作者：王晨马放山丹杨基先张建祺 School of municipal and environmental engineering Harbin Institute of Technology dept. of Civil and environmental engineering University of MarylandBaltimore County

Biological activated carbon (BAC) has been developed on the granular activated carbon by immobilization of selected and acclimated species of bacteria to treat the micro-polluted water. The BAC removal efficiencies for nitrobenzene, permanganate index, turbidity and ammonia were investigated. Effects of shock loading and SEM (Scanning Electron Microscope) observation on BAC were studied. Backwashing and its intensity of BAC were also discussed. The results showed that BAC took short time to start up and recover to the normal condition after shock loading. The shock loading studies showed that the removal efficiency of BAC was not completely inhibited even at high concentration of nitrobenzene. Backwashing performed once every 10-20 d, or an average of 15 d. Backwashing intensity was 12-14 L/(s·m2) with air and 3-4 L/(s·m2) with water.

关键词： nitrobenzene biological activated carbon micro-polluted water