www.che.com OCTOBER 2013 VOLUME 120, NO. 10 COVER STORY 38 Cover Story Biological Wastewater Treatment: Selecting the Process Basic steps for developing an industrial water-treatment process are given, using an example of a difficult-to-biodegrade wastewater stream NEWS 11 Chementator A new concept for CO2 capture: birds' lungs; New approach for biobutanol reaches " lab-pilot " scale; Control particle size and morphology with this technique; A new catalyst promises to cut the cost of the Fischer-Tropsch process; Scaleup for a CO2 mineralization process; Solid catalyst system for breaking down cellulosic biomass cuts costs; and more 17 Newsfront Improving Li-ion Batteries Researchers and technology developers are seeking improved performance, lower cost and greater safety for Li-ion batteries. Meanwhile, next-generation batteries based on alternative chemistries are inching closer to commercialization 24 Newsfront A Valve for Every Application CPI applications demand that valves stand up to harsh environments and prevent fugitive emissions. Manufacturers discuss the latest products ENGINEERING 36 Facts at Your Fingertips Fan Efficiency This one-page reference offers guidance on calculating fan efficiency and a list of tips on how to maximize it 37 Technology Profile Ethanol from Sugarcane This one-page profile describes the technology and economic considerations for the production of ethanol from sugarcane 44 Feature Report The Owner Role in Capital Projects Avoid delays, cost overruns and more with significant owner involvement 52 Engineering Practice Understanding Boiler Circulation Proper arrangement of drum baffling, sizing and location of downcomers and risers will ensure a good natural-circulation system 24 CHEMICAL ENGINEERING WWW.CHE.COM OCTOBER 2013 1 17 38http://www.che.com http://WWW.CHE.COM