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31.
Jianzhang Sun Baoyu Gao Yuanxia Luo Moxi Xue Xing Xu Qinyan Yue Yan Wang 《Frontiers of Environmental Science & Engineering》2018,12(3):11
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In this study, a high-efficiency cationic flocculant, P(DAC-MAPTAC-AM), was successfully prepared using UV-induced polymerization technology. The monomer Acrylamide (AM): Acryloxyethyl Trimethyl ammonium chloride (DAC): methacrylamido propyl trimethyl ammonium chloride (MAPTAC) ratio, monomer concentration, photoinitiator concentration, urea content, and cationic monomer DAC:MAPTAC ratio, light time, and power of high-pressure mercury lamp were studied. The characteristic groups, characteristic diffraction peaks, and characteristic proton peaks of P(DAC-MAPTAC-AM) were confirmed by fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), 1H nuclear magnetic resonance spectrometer (1H NMR), and scanning electron microscopy (SEM). The effects of dosage, pH value, and velocity gradient (G) value on the removal efficiencies of turbidity, COD, ammonia nitrogen, and total phenol by poly aluminum ferric chloride (PAFC), P(DAC-MAPTAC-AM), and PAFC/P(DAC-MAPTAC-AM) in the flocculation treatment of coal chemical wastewater were investigated. Results showed that the optimal conditions for the flocculation of coal chemical wastewater using P(DAC-MAPTAC-AM) alone are as follows: dosage of 8–12 mg/L, G value of 100–250 s ? 1, and pH value of 4–8. The optimal dosage of PAFC is 90–150 mg/L with a pH of 2–12. The optimal dosage for PAFC/P(DAC-MAPTAC-AM) is as follows: PAFC dosage of 90–150 mg/L, P(DAC-MAPTAC-AM) dosage of 8–12 mg/L, and pH range of 2–6. When P(DAC-MAPTAC-AM) was used alone, the optimal removal efficiencies of turbidity, COD, ammonia nitrogen, and total phenol were 81.0%, 35.0%, 75.0%, and 80.3%, respectively. PAFC has good tolerance to wastewater pH and good pH buffering. Thus, the flocculation treatment of coal chemical wastewater using the PAFC/P(DAC-MAPTAC-AM) compound also exhibits excellent resistance and buffering capacity. 相似文献
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Neha Badola Ashish Bahuguna Yoel Sasson Jaspal Singh Chauhan 《Frontiers of Environmental Science & Engineering》2022,16(1):7
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Jinkai Xue Seyed Hesam-Aldin Samaei Jianfei Chen Ariana Doucet Kelvin Tsun Wai Ng 《Frontiers of Environmental Science & Engineering》2022,16(5):58
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García-Nieto PJ 《Journal of environmental management》2006,79(4):372-382
This paper studies the scavenging efficiencies of aerosol emissions from coal-fired power plants under different removal mechanisms (coagulation, heterogeneous nucleation and gravitational settling) as a function of time. It also analyses the ‘health impact’ of the aerosol before and after the above dynamic mechanisms by comparing the respirable dust fractions. The well-known equations of evolution are applied to an average PSD that represents the exhaust particulate emissions from coal-fired power plants (i.e. Aboño power plant in Asturias that belongs to Hidrocantábrico Group, S.A.). From this study it is inferred that respirable dust is scavenged with the greatest difficulty and when compared with the initial volume of respirable dust, roughly 20% remains after 18 h of gravitational settling. Therefore, gravitational settling is the main removal mechanism of respirable dust compared to condensation and coagulation. 相似文献
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纤维板厂废水处理实验 总被引:2,自引:0,他引:2
用明矾作混凝剂,生石灰为助凝剂剂对纤维板厂生产废水进行混凝处理,COD去除率达67%,其上清液用延时生化法,曝气12h后,出水COD,SS,PH,色度均达到行业排放标准,沉淀用低速离心脱水,效果显著,泥饼可作为燃料综合利用。 相似文献
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四环素工业废水生化处理工艺的研究 总被引:6,自引:0,他引:6
本文报道了四环素生产废水絮凝处理的最佳组合是15mg/kg聚丙烯酰胺+3000mg/kg硫酸亚铁;经驯化的接种水测出COD为2764mg/L时,废水的BOD5为1873mg/L,BOD5/COD≈68%,属易生化处理范畴。生物膜处理可在2d内将COD从4488mg/L降至549mg/L,处理中的优势菌群为G^+芽孢杆菌。经γ射线辐射后,废水对细菌不再有抑制作用。 相似文献