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RISS 인기검색어
- 검색키워드
- 저자 : Mijia Zhu (검색결과 3 건)
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Mijia Zhu,Wei Tian,Hankui Chai,Jun Yao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
Development and application of low-cost and effective adsorbents to remove polycyclic aromatic hydrocarbons from effluents has become a research focus in recent years. We selected reed stem, ginkgo nut shell and hazelnut shell as adsorbents, and used acid hydrolysis as a simple modification technology. The adsorption isotherms of naphthalene to raw and modified adsorbents were controlled by partitioning. The adsorption capability of the hydrolysed hazelnut shell was notably enhanced at a higher level compared with that of other adsorbents. Results showed that the adsorption capacity (17250.42 μg/g) of modified hazelnut shell was observed for an initial naphthalene concentration of 25mg/L, with a contact time of 72 h, adsorbent dosage of 1 g/L and initial pH of 7.0. Furthermore, the regeneration capability of hydrolyzed hazelnut shell indicated that it was a promising adsorbent for naphthalene removal in wastewater treatment.
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Modified walnut shell filter material for the enhanced removal of oil from oilfield wastewater
Xianqing Yin,Jian Zhang,Xiujun Wang,Mijia Zhu 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.1
While polymer oil recovery greatly improves oil recovery, the polymer injected into the formation undergoes shearing, degradation, etc., and returns with the output liquid in the form of an anionic polyacrylamide of lower molecular weight, resulting in a production fluid. There is residual polymer, and this kind of polymer–containing wastewater is easy to contaminate the walnut shell filter in the sewage treatment process, resulting in failure of the walnut shell filter material, introduce hydrophilic sulfonic acid groups on the surface of the walnut shell filter material to lipophilic to hydrophilic of the surface. The dosage of NaHSO₃ is 10-20% of the mass fraction of walnut shell filter (mass ratio %). Reflux reaction, and the reaction time was 1-5 h; the surface wettability of the walnut shell reversed. The surface contact angle drops from 95° before modification to 36.75°-66.25°, Its surface hydrophilic oleophobic performance has been significantly improved, Treatment of 150-230 mg/L of oily sewage, filtration and oil removal rate increased from 38.05% to 89.51% by modification; Backwashing and degreasing effect is increased by 4 times.
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Yang Liu,Wu Chen,Shanhui Zhang,Dongpo Shi,Mijia Zhu 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.3
Electrochemical method was used for the fracturing flow-back fluid treatment in Guangyuan oilfield. After performing electrolysis, we found that the amount of H₂ gas produced by electrode was closely related to the combination mode of electrodes and electrode materials. Using an aluminium electrode resulted in a large H₂ production of each electrode combination, whereas inert anode and cathode materials resulted in low H₂ production. Then, the relationship between the gas production of H₂ and the treatment efficiency of fracturing flow-back fluid in Guangyuan oilfield was studied. Results showed that the turbidity removal and decolourisation rates of fracturing flow-back fluid were high when H₂ production was high. If the H₂ production of inert electrode was large, the energy consumption of this inert electrode was also high. However, energy consumption when an aluminium anode material was used was lower than that when the inert electrode was used, whereas the corresponding electrode combination production of H₂ was larger than that of the inert electrode combination. When the inert electrode was used as anode, the gas production type was mainly O₂, and Cl₂ was also produced and dissolved in water to form ClO−. H₂ production at the cathode was reduced because ClO− obtained electrons.
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