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Zhaokun Luan – One of the best experts on this subject based on the ideXlab platform.

  • biological sulfate removal from Acrylic Fiber manufacturing wastewater using a two stage uasb reactor
    Journal of Environmental Sciences-china, 2012
    Co-Authors: Jun Wang, Zhaokun Luan
    Abstract:

    A two-stage UASB reactor was employed to remove sulfate from Acrylic Fiber manufacturing wastewater. Mesophilic operation (35 +/- 0.5 degrees C) was performed with hydraulic retention time (HRT) varied between 28 and 40 hr. Mixed liquor suspended solids (MLSS) in the reactor was maintained about 8000 mg/L. The results indicated that sulfate removal was enhanced with increasing the ratio of COD/SO42-. At low COD/SO42-, the growth of the sulfate-reducing bacteria (SRB) was carbon-limited. The optimal sulfate removal efficiencies were 75% when the HRT was no less than 38 hr. Sulfidogenesis mainly happened in the sulfate-reducing stage, while methanogenesis in the methane-producing stage. Microbes in sulfate-reducing stage performed granulation better than that in methane-producing stage. Higher extracellular polymeric substances (EPS) content in sulfate-reducing stage helped to adhere and connect the flocculent sludge particles together. SRB accounted for about 31% both in sulfate-reducing stage and methane-producing stage at COD/SO42- ratio of 0.5, while it dropped dramatically from 34% in sulfate-reducing stage to 10% in methane-producing stage corresponding to the COD/SO42- ratio of 4.7. SRB and MPA were predominant in sulfate-reducing stage and methane-producing stage respectively.

  • pretreatment of Acrylic Fiber manufacturing wastewater by the fenton process
    Desalination, 2012
    Co-Authors: Zhaokun Luan
    Abstract:

    Fenton process was employed to pretreat the Acrylic Fiber manufacturing wastewater. The operation conditions were as follows: H2O2 and ferrous dosages were 100-800 mg/L; pH value was 1-7; reaction time was 0.5-4.0 h. In terms of COD removal and biodegradability improvement, the optimal conditions were as follows: ferrous content was 300 mg/L; hydrogen peroxide was 500 mg/L; pH value was 3.0; reaction time was 2 h. With these conditions, the overall COD removal and effluent B/C could arrive at 65.5% and 0.529 respectively. The biodegradability of the Acrylic Fiber manufacturing wastewater was increased by 429%. It was unnecessary to achieve complete mineralization of the organic compounds into carbon dioxide and water. Partial oxidation of intermediate compounds could minimize the consumption of chemical reagents and result in substantial reduction of COD and toxicity. The further biological treatment was favored by acquiring degradable low molecular weight components. (C) 2011 Elsevier B.V. All rights reserved.

  • evaluation of performance and microbial community in a two stage uasb reactor pretreating Acrylic Fiber manufacturing wastewater
    Bioresource Technology, 2011
    Co-Authors: Jun Wang, Zhaokun Luan, Yanqin Deng, Lin Chen
    Abstract:

    A two-stage UASB reactor was employed to pretreat Acrylic Fiber manufacturing wastewater. Mesophilic operation (35 ± 0.5 °C) was performed with hydraulic retention time (HRT) varied between 28 and 40 h. Mixed liquor suspended solids (MLSS) in the reactor was maintained about 8000 mg/L. The results showed COD and sulfate removal could be kept at 51% and 75%, respectively, when the HRT was no less than 38 h. Sulfate reduction mainly occurred in the acidification-stage reactor while methane production mainly occurred in the methane-stage reactor. The size of granule formed in the acidification-stage reactor ranged between 1 and 5 mm while the largest size of granule in the methane-stage reactor ranged from 0.5 to 2 mm. Compared to microbial populations in the acidification-stage reactor, the microbial diversity in methane-stage reactor was more abundant. In the acidification-stage reactor, the Syntrophobacter sulfatireducens devoted to both sulfate reduction and acetate production.

Sinopec Shanghai – One of the best experts on this subject based on the ideXlab platform.

  • Study on Dyeing Process of Anti – pilling Acrylic Fiber
    Technology-Economics in Petrochemicals, 2011
    Co-Authors: Sinopec Shanghai
    Abstract:

    The dyeing process for NaSCN method anti-pilling Acrylic Fiber was determined based on study of the affecting factors as dyeing temperature,on weight the fabric(owf),and dyeing time,connecting with leveling property test.Its mechanical properties before and after dyeing were compared,and result showed that the glass transition temperature of anti-pilling Acrylic Fiber was about 90℃,and the leveling property of Fiber was good with owf of 0.5~1.0%,temperature rising speed of 1 K/min,dyeing temperature of 105℃,and holding time of 60 min,and the dyeing conditions had little effects on the indexes of anti-pilling performance.

  • Study on Dyeing Property of NaSCN Wet-spinning Acrylic Fiber
    Technology-Economics in Petrochemicals, 2010
    Co-Authors: Sinopec Shanghai
    Abstract:

    The dyeing properties of Acrylic Fibers produced with NaSCN one – step and two – step wet – spinning processes were studied and compared. Testing results of dyeing saturation value, central value of dye – uptake rate,dyeing adsorption isothermal curve and heating dyeirg curve showed that comparing with one – step Acrylic Fibers, two – step Acrylic Fibers were low in dyeing saturation value, dyeing speed and final dye – uptake rate due to the difference in contents of the third monomers in copolymer.

  • Optimization of spinning process of anti-pilling Acrylic Fiber
    China Synthetic Fiber Industry, 2010
    Co-Authors: Sinopec Shanghai
    Abstract:

    An anti-pilling Acrylic Fiber was prepared by adjusting spinning process.The results showed that the Fiber formation would be beneficial from selecting the spinneret with relatively low orifice diameter and increasing the negative stretch ratio based on the traditional Acrylic Fiber production process.The obtained anti-pilling Acrylic Fiber had the anti-pilling grade of 4.0-4.5 when the tow bulk density of the drying machine was decreased by 3%,the wet bulb temperature was elevated to 77-80 ℃,the pressure overheated steam was adopted as heat setting medium and the heat setting temperature was 110-115 ℃.

Jun Wang – One of the best experts on this subject based on the ideXlab platform.

  • biological sulfate removal from Acrylic Fiber manufacturing wastewater using a two stage uasb reactor
    Journal of Environmental Sciences-china, 2012
    Co-Authors: Jun Wang, Zhaokun Luan
    Abstract:

    A two-stage UASB reactor was employed to remove sulfate from Acrylic Fiber manufacturing wastewater. Mesophilic operation (35 +/- 0.5 degrees C) was performed with hydraulic retention time (HRT) varied between 28 and 40 hr. Mixed liquor suspended solids (MLSS) in the reactor was maintained about 8000 mg/L. The results indicated that sulfate removal was enhanced with increasing the ratio of COD/SO42-. At low COD/SO42-, the growth of the sulfate-reducing bacteria (SRB) was carbon-limited. The optimal sulfate removal efficiencies were 75% when the HRT was no less than 38 hr. Sulfidogenesis mainly happened in the sulfate-reducing stage, while methanogenesis in the methane-producing stage. Microbes in sulfate-reducing stage performed granulation better than that in methane-producing stage. Higher extracellular polymeric substances (EPS) content in sulfate-reducing stage helped to adhere and connect the flocculent sludge particles together. SRB accounted for about 31% both in sulfate-reducing stage and methane-producing stage at COD/SO42- ratio of 0.5, while it dropped dramatically from 34% in sulfate-reducing stage to 10% in methane-producing stage corresponding to the COD/SO42- ratio of 4.7. SRB and MPA were predominant in sulfate-reducing stage and methane-producing stage respectively.

  • evaluation of performance and microbial community in a two stage uasb reactor pretreating Acrylic Fiber manufacturing wastewater
    Bioresource Technology, 2011
    Co-Authors: Jun Wang, Zhaokun Luan, Yanqin Deng, Lin Chen
    Abstract:

    A two-stage UASB reactor was employed to pretreat Acrylic Fiber manufacturing wastewater. Mesophilic operation (35 ± 0.5 °C) was performed with hydraulic retention time (HRT) varied between 28 and 40 h. Mixed liquor suspended solids (MLSS) in the reactor was maintained about 8000 mg/L. The results showed COD and sulfate removal could be kept at 51% and 75%, respectively, when the HRT was no less than 38 h. Sulfate reduction mainly occurred in the acidification-stage reactor while methane production mainly occurred in the methane-stage reactor. The size of granule formed in the acidification-stage reactor ranged between 1 and 5 mm while the largest size of granule in the methane-stage reactor ranged from 0.5 to 2 mm. Compared to microbial populations in the acidification-stage reactor, the microbial diversity in methane-stage reactor was more abundant. In the acidification-stage reactor, the Syntrophobacter sulfatireducens devoted to both sulfate reduction and acetate production.