Reusability of Discarded Tubular Ceramic Membranes for CO Removal: A Case Study for Membrane Circularity.

Discarded polymeric or ceramic membranes are currently in need of appropriate and sustainable management. In the present study, the direct reuse of discarded ceramic membranes in membrane contactor (MC) systems for CO removal was investigated for the first time. The hydrophobic surface modification of the discarded ceramic membrane was done by using macromolecule additive coating.

Waste-derived volatile fatty acid production and ammonium removal from it by ion exchange process with natural zeolite.

Volatile fatty acids (VFAs) produced during anaerobic digestion (AD) of organic waste are a promising alternative carbon source for various biological processes; however, their applications are limited due to the presence of impurities such as ammonium (NH). This study investigates the potential for removal of ammonium using a naturally occurring zeolite (clinoptilolite) from chicken manure (CKM) derived VFA effluent recovered from an anaerobic membrane bioreactor (MBR). Experiments were conducted for both synthetic and actual VFA (AD-VFA) solutions, and the effects of different parameters were investigated with batch and continuous studies.

A first attempt for using of combined sorption and anaerobic processes for handling source separated human urine.

Processing human urine with clinoptilolite results in a solid phase upon which majority of nutrients are concentrated, which may be used as fertilizer; in addition to a liquid residue to be disposed of which is saline, rich in organics and contains residual nutrients. Despite several work regarding nutrients recovery from human urine, the fate of organic matter in the liquid residue is yet to be revealed. This study aims to investigate the combination of sorption and anaerobic processing (ANA) to accomplish concurrent nutrient recovery, and organic matter removal from hydrolyzed human urine (HHU) for environmental protection.