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- 저자 : Guanyi Chen (검색결과 3 건)
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CrOx–MnOx–TiO2 adsorbent with high resistance to SO2 poisoning for Hg0 removal at low temperature
Guanyi Chen,Dan Zhang,Anchao Zhang,Zhihui Zhang,Zhichao Liu,Li’an Hou 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
Chromium modified MnOx–TiO2 (CMT), MnOx–TiO2 (MT) and CrOx–TiO2 (CT) adsorbents were prepared by a sol–gel method and were investigated for Hg0 removal in the absence and presence of SO2. The fresh and used adsorbents were characterized by N2 physisorption, XRD, FTIR, H2-TPR, XPS and TG. The results showed that the addition of Cr into MT can not only increase the activity of Hg0 removal, but also improve its SO2 resistance performance. The amount of manganese sulfate formed onto spent CMT was much higher than that of chromium sulfate, meaning that sulfate species were formed preferentially on Mn rather than Cr.
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Jinfeng Zhang,Guanyi Chen,Yanning Ma,Miao Xu,Songyan Qin,Xiaoliang Liu,Haijun Feng,Lian Hou 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1
A new technique for treating pickling wastewater discharged from the steel industry using membrane filters was developed and membrane fouling was characterized in a full scale membrane filter. The morphological and chemical properties were examined through scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and inductively coupled plasma optical emission spectroscopy (ICP-OES) etc. The results showed that inorganic elements such as phosphates, chlorides, and sulfates were severely blocked in membrane surfaces and pores. The porosity, permeability, hydrophilic contact angle, and surface charge capacity of fouled membranes were all lower than those of new membranes, while the optimal neutralization reaction pH region for fouled membranes shifted and narrowed. Charge neutralization is a critical reason to membrane fouling. By increasing the Zeta potential of the pickling wastewater, the membrane fouling could be controlled. This method is proven to effectively improve the separation property of precipitates after pickling wastewater was neutralized. Moreover, Neutralization helped to reduce the unit number of treatment processes. This investigation could assist in obtaining a better understanding of the fouling properties and behavior in the full-scale membrane filters in the pickling wastewater treatment.
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Jinfeng Zhang,Guanyi Chen,Qin Zhang,Yi Luo,Chunsong Wu,Songyan Qin 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.3
Tetracycline antibiotic wastewater with high chemical oxygen demand (COD) concentration and containing bio-refractory compounds was investigated in a lab-scale up-flow anaerobic sludge blanket (UASB) and anoxic-oxic (A/O) reactor. Specific methanogenic activity (SMA) was determined to reveal the inhibition levels of methane production and volatile fatty acid (VFA) accumulation. The results showed that microorganisms can adapt to tetracycline or oxytetracycline when the concentration of antibiotics is less than 400 mg/L. Acetic acid, propanoic acid, and n-butyric acid accounted for more than 90% of VFA with increasing antibiotic concentration from 50 mg/L to 600 mg/L. During the 215 d of operation, the concentration of tetracycline antibiotic increased from 0 to 95 mg/L, and the COD concentration from 3,500 to 6,500 mg/L. The average COD and tetracycline antibiotic removal rates of the reactors were maintained above 90%. The methane production of the UASB reactor achieved 0.32 L/g COD. VFA accumulation was observed when tetracycline antibiotic concentration increased to 47.5 mg/L. The sludge granule diameter increased from 0–300 μm to 300–1,500 μm during the operation. Rod-shaped and coccus-shaped organisms with pores and internal channels on the granule surface were observed using scanning electron microscopy. In the internal space, methanogenic filamentous bacteria constitute a rock-steady structure.
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