Are you Xie Qinglin?

Claim your profile

Publications (4)2.24 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To study the optimal performance characteristics and maximize the removal efficiency of contaminants by the constructed floating islands (CFIs), four kinds of parallel pilot-scale CFIs with different structures were set up outdoors to treat eutrophic water for approximately 6 months. The contribution of artificial aeration to nutrient removal on the basis of gas-water ratios was investigated, and the influences of the structure and temperature were evaluated simultaneously. It was noted that the nutrient removal rate of the multi-medium CFI was greater than those of others. In the four kinds of units, aeration could significantly increase the nutrient removal efficiency, and a gas-water ratio of 10 was adequate for the relatively high removal of nutrients. Using the aforementioned gas-water ratio of 10 and a hydraulic residence time (HRT) of 2 days, the mean removal efficiencies of the multi-medium CFI for NH3-N and total phosphorus were 71.7% and 63.6%, respectively-approximately twice as great as those in the non-aerated system. Furthermore, temperature was an important factor for nutrient removal in the multi-medium CFI. With the water temperature of >13 degrees C and the HRT of 2.5 days, the mean removal efficiencies for NH3-N and total phosphorus were 87.6% and 83.5%, respectively, whereas the removal efficiency decreased significantly when the temperature was lower than 13 degrees C.
    Water Environment Research 05/2012; 84(5):405-10. · 1.13 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: An expanded granular sludge bed (EGSB) reactor was adopted to incubate the sludge biogranule that could simultaneously achieve sulfate reduction and sulfide reoxidization to elemental sulfur for treating molasses distillery wastewater. The EGSB reactor was operated for 175 days at 35 °C with a pH value of 7.0, chemical oxygen demand (COD) loading rate of 4.8 kg COD/(m³ d), and sulfate loading rate of 0.384 kg SO(4)(2-)/(m³ d). The optimal operation parameters, including the oxidation reduction potential (ORP), recycling rate, and hydraulic retention time (HRT), were established to obtain stable and acceptable removal efficiencies of COD, sulfate, and higher elemental sulfur production. With an ORP of -440 mV, a recycling rate of 300%, and HRT of 15 h, the COD and sulfate removal efficiencies were 73.4 and 61.3%, respectively. The elemental sulfur production ratio reached 30.1% when the elemental sulfur concentration in the effluent was 48.1 mg/L. The performance results were also confirmed by the mass balance calculation of sulfate, sulfide, and elemental sulfur over the EGSB reactor.
    Water Science & Technology 01/2012; 66(6):1253-62. · 1.10 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Three oil degrading strains, named JZ3, JZ10 and JZ4 were screened out from an oil wastewater treatment plant. Their oil removal rates were 52.9%, 52.27%and 50.65%, respectively. The effect of temperature, pH, shaking speed, inoculation amount and culture time were studied. It was showed that the optimal temperatures of the JZ3, JZ4 and JZ10 were all 40°C; the optimal pH values were 7, 6, 5.5, respectively, the optimal shaking speeds were 110r/min, 130r/min, 110r/min, respectively, the optimal inoculation amounts were 3%, 3%, 2%, respectively, the optimal culture times were 6h, 21h, 22h, respectively.
    01/2011;
  • [Show abstract] [Hide abstract]
    ABSTRACT: A new method of microorganism acclimation for biological treatment of high-salinity oilfield wastewater was proposed, in which the salinity was increased in logarithmic mode, while in the traditional method the salinity was mainly increased in proportion. A contrast experiments was made between new method and the traditional method. The quality of the influent is as follow: salt content was ranged from 27.4 to31.8 g L¨C1, the value of COD ranged from 350 to 640 mg L¨C1, the petroleum hydrocarbon was 10.5 mg L¨C1. The COD removal rate, bacteria adaptation rate and petroleum hydrocarbon removal rate of the new method was 82.3%,86.1% and 69.2%, respectively. These value of traditional method was 72.4%, 75.6% and 60.8%, respectively. The activated sludge acclimated by the new method is less vulnerable to high salt concentration and the structures of the sludge are more stable than the sludge acclimated by the traditional method.
    Computer Distributed Control and Intelligent Environmental Monitoring, International Conference on. 01/2011;