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mfw553947967金虫 (著名写手)
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[求助]
一段论文翻译，求助，非常感谢
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The efficiency of removing organic substances from source water by coagulation in clarifiers does not exceed 50–70%. The use in clarifiers of imported flocculants (among which are neutral ones like Accoflock No. 100, weakly cationite ones like Accoflock C-483, and anionite ones like Accoflock A-110 and Accoflock A-130) and domestically produced flocculants (PAA and VPK-402) allows the throughput capacity of clarifiers to be increased by 15–20% and the efficiency of removing organic matter to be improved by 10-20%. Metering powdered activated carbon into clarifier also somewhat increases the extent of removing organic impurities, but this operation requires up to 0.5 kg/t of activated carbon. In addition, the treatment of water in clarifiers requires bulky equipment and has well-known drawbacks as far as control and closed-loop regulation of its operation are concerned. Gellike ion-exchange materials made using polystyrene as a basic component (AB-17-8) decrease to some extent the concentration of organic compounds in the water being treated, but they themselves are “poisoned” by these compounds. This is manifested in the working capacity dropping, the quality of filtrate deteriorating, and the consumption of water for washing increasing. Anionites having macroporous and isoporous structures feature a higher capacity with respect to organic contaminants and resistance to “poisoning.” Sequential treatment of water with weakly and strongly alkaline anionites, e.g., JRA-67 and JRA-900, allows as much as 80–90% of organic matter to be removed. However, this technology requires a large consumption of alkali, because 30% of the spent regeneration solution for the secondstage anionite filter has to be discharged; it involves periodic recovery-cleaning operations carried out using salt and salt-alkaline solutions, and the relevant operating conditions need to be individually adjusted [2]. |
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mfw553947967: 金币+30, 翻译EPI+1, ★★★很有帮助 2013-04-26 21:10:20
爱与雨下: 金币-30, 翻译EPI-1 2013-04-26 21:44:52
爱与雨下: 金币-30, 翻译EPI-1 2013-04-26 21:44:52
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