Investigation on Wastewater Reuse on Passenger Aircraft

Abstract

In order to reduce the take-off weight on passenger aircraft the possible incorporation of water recycling systems on deep space flights was investigated. The treatment system, composed of several non-phase change units, was studied in laboratory scale. Mainly membrane separation techniques (micro/ultrafiltration, reverse osmosis, electrodialysis) and ozone oxidation were examined. The pretreatment stage with screen, gap filter and micro/ultrafiltration unit is an integral part of the recycling system in order to protect the suceeding stages against clogging and biofouling. For the main treatment stage the combination of reverse osmosis and electrodialysis achieved the best quality water. Although the investigations conduced so far it was not possible to meet the treatment goal “drinking water quality”. Residual TOC identification should be carried on and the possible introduction of compounds through disinfectants in the wastewater system on ground before departure should be avoided.