State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry

Shanghai, China

State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry

Shanghai, China
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Wang J.,Donghua University | Huang M.,Donghua University | Huang M.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Zhang C.,Donghua University | Meng L.,Donghua University
Chinese Journal of Environmental Engineering | Year: 2017

Rejection of carbamazepine (CBZ) by three commercial forward osmosis (FO) membranes was investigated. The effects of membrane orientation, draw solution concentration, flow velocity, and draw solute were also explored. The results showed that the rejection of CBZ in the pressure-retarded osmosis mode was lower than that in FO mode. As draw solution concentration increased, the increase in CBZ rejection became slow and high draw concentration caused serious reverse salt flux. The effect of flow velocity on a thin-film composite with an embedded polyester screen (TFC-ES) was more significant than on the other two membranes. The cellulose triacetate membrane cast onto a non-woven backing (CTA-NW) displayed lower rejection as the flow velocity increased. NaCl was the most suitable draw solute for CBZ rejection. The rejection of CBZ increased with water flux, but high reverse salt flux may result in decrease of CBZ rejection. The cellulose triacetate membrane with an embedded polyester screen (CTA-ES) showed consistently higher CBZ rejection than the CTA-NW membrane, while the TFC-ES membrane showed even lower rejection than the CTA membranes. These results can provide parameters for the treatment of CBZ water by a FO process. © 2017, Science Press. All right reserved.


Hu T.,Donghua University | Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Wang Y.,Donghua University | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2017

To research the operational characteristics of an air-lift external-circulation vortex-enhancement nitrogen-removal bioreactor (reactor I), two reactors were run using a sequencing batch reactor (SBR)process. In comparison with a common internal-circulation biological nitrogen reactor (reactor II), the performance of reactor I was investigated using statistical methods on the removal efficiency, stability, variation in trajectory parameters, advantages of the bacterial community, appropriate influent quality parameters, and other operational characteristics. The results showed that the operational performance of reactor I was more favorable than that of reactor II during both start-up and stable operation. During start-up, the values of CV(COD), S(COD), CV(NH+4-N), S(NH+4-N), CV(TN), and S(TN) in reactor I were 0.77, 0.26, 0.96, 0.95, 0.95, and 0.71 times those in reactor II, respectively. During stable operation, the values of CV(COD), S(COD), CV(NH+4-N), S(NH+4-N), CV(TN), and S(TN) in reactor I were 0.92, 0.87, 0.35, 0.22, 0.96, and 0.82 times those in reactor II, respectively. During stable operation, Proteobacteria, Bacteroidetes, Chloroflexi, Nitrospira, and others dominant genera in reactor I were higher than that in reactor II as determined by high-throughput DNA sequencing. The diversity of microbial communities was higher in reactor I than it was in reactor II. The most suitable NH4 +-N influent concentration and pH were from 200 to 300 mg·L-1 and 7.0 to 8.0, respectively. © 2017, Science Press. All right reserved.


Li Y.,Donghua University | Li Y.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Cai W.,Donghua University | Cai W.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2017

The influences of different C/N ratios (15, 20.7, 24.6, and 30) on high-water-content municipal solid waste (MSW) biodrying were studied using self-made equipment, and the RDF yield and properties of four trial products were determined. The results showed that there are significant differences in the chemical properties and dewatered efficiencies between the different C/N ratios of MSW. Lower C/N ratio increased the pH and NH3 emissions of the MSW. The MSW with a C/N ratio of 20.7 led to more effective water content evaporation, higher dehydration ratio of per raw wet waste, stronger water removal capacity of per organic waste decomposition, and lower heat value (LHV) than the other experimental groups did, so it is the optimal C/N ratio for biodrying of MSW. After 12 days of bio-drying.the water content in the four trials decreased by 16.5%, 20.3%, 13%, and 15.4% for the 15, 20.7, 24.6, and 30 C/N ratios, respectively, and compared to that of the initial waste, the LHV was enhanced by 78.3%, 114.5%, 65.8%, and 79.0%, respectively. The LHVs of the four trial biodried products met the garbage incineration economic requirements, and its chlorine and sulfur contents were below 0.5%.The heavy metals content was within reasonable levels, and therefore the biodried products can be used as RDF fuel preparation feedstock. © 2017, Science Press. All right reserved.


Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Xiang X.,Donghua University | Dai R.,Donghua University | And 2 more authors.
Bioresource Technology | Year: 2017

The minimization and methane production of textile dyeing sludge (TDS) can be simultaneously attained via anaerobic digestion (AD). However, the possible toxicity and complex recalcitrant organic matters involved in limited the hydrolysis of TDS. Therefore, the low-temperature of thermal pretreatment (LTTP) lasting for 1 h at temperatures from 60 to 100 °C was employed to accelerate the hydrolysis and subsequent methane generation of TDS. The results showed that LTTP with temperatures higher than 70 °C obviously improve the AD performance of TDS. Highest accumulative methane production was achieved for 100 °C pretreated TDS and from thermal analysis point of view it was due to the disintegration of some recalcitrant macromolecules in TDS. Nevertheless, 90 °C pretreated TDS did not perform favorable methane yield as expected, attributing to the inhibited acetogenesis as well as the hindered methanogenesis which was simultaneously competed by dye reducer for electrons. © 2017 Elsevier Ltd


Li R.,Shanghai University of Engineering Science | Liu Y.,Shanghai University of Engineering Science | Liu Y.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Mu R.,Shanghai University of Engineering Science | And 2 more authors.
Environmental Science and Pollution Research | Year: 2016

Petroleum hydrocarbons released to the environment caused by leakage or illegal dumping pose a threat to human health and the natural environment. In this study, the potential of a pulsed corona discharge plasma system for treating petroleum-polluted soils was evaluated. This system removed 76.93 % of the petroleum from the soil in 60 min with an energy efficiency of 0.20 mg/kJ. Furthermore, the energy and degradation efficiencies for the remediation of soil contaminated by single polyaromatic hydrocarbons, such as phenanthrene and pyrene, were also compared, and the results showed that this technology had potential in organic-polluted soil remediation. In addition, the role of water molecules was investigated for their direct involvement in the formation and transportation of active species. The increase of soil moisture to a certain extent clearly benefitted degradation efficiency. Then, treated soils were analyzed by FTIR and GC-MS for proposing the degradation mechanism of petroleum. During the plasma discharging processes, the change of functional group and the detection of small aromatic hydrocarbons indicated that the plasma active species attached petroleum hydrocarbons and degradation occurred. This technique reported herein demonstrated significant potential for the remediation of heavily petroleum-polluted soil, as well as for the treatment of organic-polluted soils. © 2016 Springer-Verlag Berlin Heidelberg


Wu L.-X.,Donghua University | Wu L.-X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Yang J.,Donghua University | Yang J.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | And 4 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

Cobalt tetrasulfophthalocyanine was successfully immobilized on polystyrene resin, protecting them from the self-oxidation under oxidation conditions. The results showed that the removal efficiency of dye C. I. Acid Blue 25 achieved to 99% in the presence of polystyrene resin D201 supported cobalt tetrasulfophthalocyanine and hydrogen peroxide. Besides, the regeneration studies demonstrated that the polystyrene resin immobilized catalyst could be reused effectively. The main mechanism was that cobalt tetrasulfophthalocyanine was firmly anchored through the electronic interactions between the π electrons of the benzene rings of the polystyrene polymers in resin and macrocycle of phthalocyanines. Then its drawback of self-oxidation was improved and the catalytic activity was enhanced. ©, 2015, Zhongguo Huanjing Kexue/China Environmental Science. All right reserved.


Dai R.,Donghua University | Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Luo Y.,Donghua University | And 4 more authors.
Water Research | Year: 2016

Inhibitory effect of azo dyes on anaerobic methanogenic wastewater treatment (AMWT) has been studied mainly focusing on biological toxicity in the batch test with simulated sole co-substrate. Detailed information on inhibitory effect and mechanism of azo dyes during the long-term operation with real complex co-substrate is limited. Moreover, whether redox mediator (RM) could remediate the inhibition is still unclear in previous studies, especially under the complex scenario. In this study, the real textile wastewater with alternative concentrations of azo dyes (0–600 mg/L) were used to operate a lab-scale high-rate anaerobic methanogenic bioreactor for 127 days, and 50 μM anthraquinone-2-sulfonate (AQS) as RM was added at the last period of operation. Azo dyes with concentration of 600 mg/L could cause significant inhibition on overall (decolorizing and methanogenic) performance of AMWT. Specific methanogenic activity assays showed that acetoclastic methanogens was more susceptible to high concentration azo dyes than hydrogenotrophic methanogens. The spatial distribution of extracellular polymeric substance in the anaerobic granular sludge (AGS) showed that the high biological toxicity of azo dyes was mainly attributed to enrichment effect in tightly bound-EPS (TB-EPS). The channels of AGS was clogged by azo dyes, which was evidenced by the hard release of aromatic amines in EPSs as well as decreased porosity of AGS and scanning electron microscope images. Meanwhile, the settling ability, particle size and strength of AGS all deteriorated after azo dyes concentration exceeded 450 mg/L. The dosing of AQS could mostly remediate overall performance of the bioreactor even if the recovery of acetoclastic methanogens was slow. However, except for the porosity with a part of recovery, physical characteristics of AGS hardly recovered, and washout of sludge from the bioreactor was still happening. It suggested that additional attention should be paid to prevent sludge from washout if RM was practically used to remediate the anaerobic reactor inhibited by azo dyes. © 2016 Elsevier Ltd


Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Dai R.,Donghua University | Xiang X.,Donghua University | And 4 more authors.
Water Science and Technology | Year: 2016

The shock resistance characteristic (SRC) of an anaerobic bioreactor characterizes the ability of the anaerobic community in the reactor to withstand violent change in the living environment. In comparison with an upflow anaerobic sludge blanket reactor (UASBR), the SRC of a spiral symmetry stream anaerobic bio-reactor (SSSAB) was systematically investigated in terms of removal efficiency, adsorption property, settling ability, flocculability and fluctuations in these parameters. A quantitative assessment method for SRC was also developed. The results indicated that the SSSAB showed better SRC than the UASBR. The average value (m value) of chemical oxygen demand removal rates of the SSSAB was 86.0%. The contact angle of granules in the SSSAB present gradient distribution, that is the m value of contact angle increasing from bottom (84.5W) to top (93.9W). The m value of the density at the upper and lower sections of the SSSAB were 1.0611 g•cm-3 and 1.0423 g•cm-3, respectively. The surface mean diameter of granules in the SSSAB increased from 1.164 to 1.292 mm during operation. The absolute m value of zeta potential of granular sludge at the upper and lower sections of the SSSAB were 40.4 mV and 44.9 mV, respectively. The weighted mean coefficient variance (CV) value indicated SSSAB was more stable than the UASBR. © 2016 IWA Publishing.


Li R.,Donghua University | Sun Y.,Donghua University | Mu R.,Donghua University | Cheng W.,Donghua University | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2016

Phenanthrene (PHE) contaminated soils were remediated by dielectric-barrier discharge (DBD) plasma. The effect of the power parameters (voltage, frequency, duty cycle, and discharging gap) on the input energy, as well as the influence of power, soil properties, and gas on the removal efficiency, was investigated. The optimal condition was selected for the post-treatment and mechanism study by considering the treatment effect, discharging properties, and energy utilization. The results showed that the removal efficiency of PHE contaminated soil by DBD plasma technology could reach 82% after treatment for 20 min in the following conditions. These conditions were input voltage 110 V, pulsed frequency 150 Hz, duty cycle 20%, discharging gap 1.5 cm, airflow rate 0.6 L·min-1, initial concentration 200 mg·kg-1, and water content of the soil 4%. The input power in this instance was 64 W and the energy efficiency was 0.04 mg·kJ-1. © 2016, Science Press. All right reserved.


Xiang X.,Donghua University | Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Dai R.,Donghua University | And 5 more authors.
Bioresource Technology | Year: 2016

Abundant organic compounds in textile dyeing sludge (TDS) provide possibility for its anaerobic digestion (AD) treatment. However, preliminary test showed little biogas generation in direct AD of the TDS during 20 days. In order to improve the AD availability of TDS, alkaline, acid, thermal and thermal alkaline pretreatments were performed. Color and aromatic amines were specifically measured as extra characteristics for the AD of TDS. The rate-limiting steps of AD of TDS were slow hydrolysis rate and inhibited acidogenesis, which were somewhat overcome by pretreatments. Thermal alkaline pretreated TDS performed best enhancement on solubilisation. The biochemical methane potential tests revealed that thermal pretreated TDS showed highest total methane production of 55.9 mL/g VSfed compared to the control with little methane generation. However, thermal alkaline pretreated TDS did not perform well in BMP test as expected. Moreover, the hydrophilicity of reactive dyes in TDS could seriously affect dewaterability of TDS. © 2016 Elsevier Ltd

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