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Inhibitory effect of high phenol concentration in treating coal gasification wastewater in anaerobic biofilter

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Journal of Environmental Sciences 2018年第2期30卷 207-215页

作者： Yajie Li Salma Tabassum Chunfeng Chu Zhenjia Zhang School of Environmental Science and Engineering Suzhou University of Science and Technology School of Environmental Science and Engineering Shanghai Jiao Tong University

In this paper, the inhibition of methanogens by phenol in coal gasification wastewater（CGW）was investigated by both anaerobic toxicity tests and a lab-scale anaerobic biofilter reactor（AF）. The anaerobic toxicity tests indicated that keeping the phenol concentration in the influent under 280 mg/L could maintain the methanogenic activity. In the AF treating CGW,the result showed that adding glucose solution as co-substrate could be beneficial for the quick start-up of the reactor. The effluent chemical oxygen demand（COD） and total phenol reached1200 and 100 mg/L, respectively, and the methane production rate was 175 m L CH4/g COD/***, if the concentration of phenol was increased, the inhibition of anaerobic micro-organisms was irreversible. The threshold of total phenol for AF operation was 200–250 mg/L. The extracellular polymeric substances（EPS） and particle size distribution of anaerobic granular sludge in the different stages were also examined, and the results indicated that the influence of toxicity in the system was more serious than its effect on flocculation of EPS. Moreover, the proportion of small size anaerobic granular sludge gradually increased from10.2% to 34.6%. The results of high through-put sequencing indicated that the abundance of the Chloroflexi and Planctomycetes was inhibited by the toxicity of the CGW, and some shifts in the microbial community were observed at different stages.

关键词： Inhibition Phenol Co-digestion Anaerobic biofilters coal gasification wastewater

Enhanced anaerobic biodegradability of real coal gasification wastewater with methanol addition

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Journal of Environmental Sciences 2010年第12期22卷 1868-1874页

作者： Wei Wang,Hongjun Han,Min Yuan,Huiqiang Li State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China

coal gasification effluent is a typical refractory industrial wastewater with a very poor anaerobic biodegradability due to its toxicity. Methanol was introduced to improve anaerobic biodegradability of real coal gasification wastewater, and the effect of methanol addition on the performance was investigated in a mesophilic upflow anaerobic sludge bed reactor with a hydraulic retention time of 24 hr. Experimental results indicated that anaerobic treatment of coal gasification wastewater was feasible with the addition of methanol. The corresponding maximum COD and phenol removal rates were 71% and 75%, respectively, with methanol concentration of 500 mg COD/L for a total organic loading rate of 3.5 kg COD/（m^***） and a phenol loading rate of 0.6 kg/（m^***）. The phenol removal rate was not improved with a higher methanol concentration of 1000 mg COD/L. Substrate utilization rate （SUR） tests indicated that the SURs of phenol were 106, 132, and 83 mg phenol/（g ***） at methanol concentrations of 250, 500, and 1000 mg COD/L, respectively, and only 45 mg phenol/（g ***） in the control reactor. The presence of methanol could reduce the toxicity of coal gasification wastewater and increase the biodegradation of phenolic compounds.

关键词： coal gasification wastewater anaerobic biodegradability phenol methanol

Inhibition and recovery of nitrification in treating real coal gasification wastewater with moving bed biofilm reactor

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Journal of Environmental Sciences 2011年第4期23卷 568-574页

作者： Huiqiang Li Hongjun Han Maoan Du Wei Wang State Key Laboratory of Urban Water Resources and Environment Harbin Institute of Technology Harbin 150090 China.

Moving bed biofilm reactor （MBBR） was used to treat real coal gasification wastewater. Nitrification of the MBBR was inhibited almost completely during start-up period. Sudden increase of influent total NH 3 concentration was the main factor inducing nitrification inhibition. Increasing DO concentration in the bulk liquid （from 2 to 3 mg/L） had little effect on nitrification recovery. Nitrification of the MBBR recovered partially by the addition of nitrifying sludge into the reactor and almost ceased within 5 days. Nitrification ratio of the MBBR achieved 65% within 12 days by increasing dilute ratio of the influent wastewater with tap water. The ratio of nitrification decreased to 25% when influent COD concentration increased from 650 to 1000 mg/L after nitrification recovery and recovered 70% for another 4 days.

关键词： moving bed biofilm reactor coal gasification wastewater nitrification inhibition nitrification recovery

Performance of the Full-scale Loop Hybrid Reactor Treating coal gasification wastewater under Different Recirculation Modes

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Journal of Harbin Institute of Technology(New Series) 2015年第5期22卷 31-37页

作者： Qian Zhao Hongjun Han Fang Fang Wang Bing State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology School of Municipal and Environmental Engineering Shenyang Jianzhu University

This paper aims to investigate the simultaneous removal efficiencies of both COD and nitrogen in a single reactor treating coal gasification wastewater( CGW). A novel loop hybrid reactor was developed and operated under different recirculation modes in order to achieve simultaneous removal of refractory compounds and total nitrogen( TN) in a full-scale CGW treatment plant. Mid-ditch recirculation was superior to other operational modes in terms of the NH3-N and TN removal,resulting in a TN removal efficiency of 52. 3%.Although the system achieved equal COD removal rates under different recirculation modes,hydrophobic acid( HPO-A) fraction of effluent dissolved organic matter( DOMef) in mid-ditch recirculation mode accounted for35.7%,compared to the proportions of 59. 2%,45. 3% and 39. 4% for the other modes. The ultraviolet absorbance to dissolved organic carbon ratio test revealed that effluent under mid-ditch recirculation mode contained more non-aromatic hydrophilic components. Furthermore,appropriate recirculation and anoxic / oxic( A/O) partitions were also demonstrated to remove some refractory metabolites( phenols,alkanes,aniline,etc.),which reduced the chromaticity and improved the biodegradability.

关键词： coal gasification wastewater refractory COD total nitrogen recirculation mode DOM fractionation

Degradation of Phenolic Compounds in coal gasification wastewater by Biofilm Reactor with Isolated Klebsiella sp.

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Journal of Harbin Institute of Technology(New Series) 2014年第3期21卷 9-17页

作者： Fang Fang Hong-Jun Han Chun-Yan Xu Qian Zhao Ling-Han Zhang State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

This study was conducted to evaluate the degradation of phenolic compounds by one strain isolated from coal gasification wastewater( CGW). 16S rRNA gene sequences homology and phylogenetic analysis showed that the isolate is belonged to the genus Klebsiella sp. The effect of different phenolic compounds on the isolate was investigated by determining OD600and phenoloxidase activity,of which the results showed that the isolate can utilize phenol,4-methyl phenol,3,5-dimethyl phenol and resorcinol as carbon resources. The biofilm reactor( formed by the isolate) can resist the influent concentration of phenolic compounds as high as750 mg /L when fed with synthetic CGW and incubated at optimum conditions. The capacity of improving the biodegradability of CGW through degrading phenolic compounds was testified with fed the biofilm reactor with real CGW. Thus,it might be an effective strain for bioaugmentation of CGW treatment.

关键词： phenol degradation coal gasification wastewater bacteria isolate phenoloxidase

A Pilot-scale Study on coal gasification wastewater Reclamation Using Pretreatment Alternatives Combined with Ultrafiltration and Reverse Osmosis

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Journal of Harbin Institute of Technology(New Series) 2015年第6期22卷 11-20页

作者： Qian Zhao Hongjun Han Fang Fang Peng Xu Kun Li Dexin Wang State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Aims to investigate the performance of the pilot-scale reclamation plant for coal gasification wastewater( CGW) using ultrafiltration and reverse osmosis with appropriate pretreatment alternatives,different pre-treatment alternatives- coagulation,adsorption,and ozonation methods were employed to treat the secondary effluent of coal gasification wastewater( SECGW) in a pilot-scale pressurized membrane system. The performance was compared to choose the most suitable pre-treatment alternative for the SECGW *** reaction achieved highest COD removal efficiency( 79.6%- 91.0%),resulting in the stable normalized parameters of the subsequent ultrafiltration and reverse osmoses. In contrast,the coagulation and adsorption processes achieved only 32. 8%- 45. 7% and 53. 1%- 64. 6% decreases in COD,respectively. The residual organic pollutants in the reverse osmosis feed water led to an increase in normalized pressure drop and a decrease in normalized permeability( or membrane transference coefficient). The hydrophobic fraction was the main constituent( approx. 70% of DOC) in pretreated SECGW, and the hydrophobic-neutral fraction contributed mostly to the UV absorbance( 53%). Fluorescence excitation emission matrices revealed that ozonation removed most of the hydrophobic and aromatic proteins such as tyrosine and tryptophan which dominated in raw wastewater. The recalcitrant compounds such as phenolic compounds, heterocyclic compounds,especially long-chain hydrocarbons,which were easily attached to the membrane surface and contributed to organic fouling,could be oxidized and mineralized by ozone. Among the three pretreatments,ozonation showed highest removal efficiencies of hydrophobic and aromatic proteins,therefore resulting in highest normalized permeability.

关键词： coal gasification wastewater pretreatment ultrafiltration reverse osmosis ozonation

Supported liquid membrane extraction to treat coal gasification wastewater containing high concentrations phenol

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Journal of Harbin Institute of Technology(New Series) 2012年第1期19卷 55-57页

作者：姚杰何志茹雒安国赵琪贾丽邵泽辉李彪铭 School of Municipal and Environmental Engineering Harbin Institute of Technology National Engineering Research Center of Urban Water Resources Dongying Running Water Company

The hollow fiber supported liquid membrane extraction was introduced to treat coal gasification wastewater to recover phenolic compounds,with tributyl phosphate (TBP) as carrier,kerosene as the membrane solvent,sodium hydroxide solution as the stripping agent and PVDF as the membrane material. Factors having strong impact on the extraction efficiency were studied in detail,including the mass transfer mode,twophase flow rate,stripping phase concentration. As extraction system with 20% TBP-kerosene,parallel flow mass transfer,stripping phase concentration 0.1 mol/L,the optimal operating conditions could be obtained. Under the optimum operating conditions,the time required to reach equilibrium for the extraction is 50 min, and extraction efficiency of phenol is 86. 2% and the phenol concentration of effluent is 98.64 mg/L.

关键词： supported liquid membrane coal gasification wastewater phenol extraction etticiency

The Role of Diatomite Particles in the Activated Sludge System for Treating coal gasification wastewater

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Chinese Journal of Chemical Engineering 2009年第1期17卷 167-170页

作者：张文启饶品华张辉徐菁利 School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China

Diatomite is a kind of natural low-cost mineral material. It has a number of unique physical properties and has been widely used as an adsorbent in wastewater treatment. This study was conducted to investigate the aerobic biodegradation of coal gasification wastewater with and without diatomite addition. Experimental results indicated that diatomite added in the activated sludge system could promote the biomass and also enhance the performance of the sludge settling. The average mixed-liquor volatile suspended solids （MLVSS） is increased from 4055 mg.L^-1 to 4518 mg.L^-1 and the average settling volume （SV） are changed only from 45.9% to 47.1%. Diatomite additive could enhance the efficiency of chemical oxygen demand （COD） and total phenols removal from the wastewater. The COD removal increased from 73.3% to near 80% and the total phenols removal increased from 81.4% to 85.8%. The mechanisms of the increase of biomass and pollutants removal may correlates to the improvement of bioavailability and sludge settlement characteristics by diatomite added. Micrograph of the sludge in the diatomite-activated sludge system indicated that the diatomite added could be the carrier of the microbe and also affect the biomass and pollutant removal.

关键词： diatomite phenols coal gasification wastewater activated sludge

An experimental investigation on phenol wastewater treatment from coal gasification by pervaporation with NaY molecular Sieve filling membrane

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Journal of Harbin Institute of Technology(New Series) 2012年第1期19卷 121-124页

作者：姚杰何志茹雒安国赵琪邵泽辉贾丽李彪铭 School of Municipal and Environmental Engineering Harbin Institute of Technology National Engineering Center of Urban Water Resources Harbin Institute of Technology Dongying Running Water Company

In the experiment,PDMS membrane with NaY molecular sieve filling were chosen as the experimental objects and the flux of phenol and removal efficiency of phenol as evaluation index,the effect of the system operating temperature,the flow rate,liquid membrane downstream pressure,operation time,and filling proportion of NaY molecular sieve on pervaporation treatment efficiency for wastewater from coal gasification were investigated. With the increase of temperature and feed flow rate,pervaporation flux and phenol removal efficiency increases. The decrease of the membrane downstream pressure and elevating NaY molecular sieve filling proportion may result in the increase of flux and then phenol removal efficiency improves. When NaY molecular sieve filling proportion is 45% ,treatment efficiency is the best for coal gasification wastewater containing 1850 mg/L phenol as the flux of phenol was 12948. 23 mg/(h·m2) .

关键词： coal gasification wastewater pervaporation PDMS membrane NaY molecular sieve filling mem- brane