Gray water treatment by air-gap multi-effect membrane distillation with pre-treatment by electrocoagulation

Abstract

The gap between supply and demand of fresh water is widening due to increase in global population. Hence, an alternative source of water such as gray water could potentially save a significant amount of precious fresh water. Gray water is distinct from black water by the amount and composition of its chemical and biological contaminants. In this paper, an air-gap Multi-effect membrane distillation (MEMD) module performance for gray water treatment is described. Surfactant present in the gray water was wetting the membrane pores. Hence, electrocoagulation was used as a pre-treatment of gray water feed. About 99.14% surfactants were removed by electrocoagulation and the experiment shows excellent performance of the MEMD module. The 4-stage MEMD module offered permeate fluxes nearly to 50.12 l/m2 h at 80 °C. It was also found that a high thermal efficiency and output gain ratio was possible with lower specific energy and no cooling water. Hence, it is apparent that the air gap MEMD technology could be used for gray water treatment. Pre-treatment by electrocoagulation (EC) operation seems an important step in the overall treatment process when large amounts of surfactants are present in the treatment water. Highlights The air-gap MEMD module is developed for gray water treatment.; The electrocoagulation is used as a pre-treatment and achieved 99.8% removal of surfactant.; The effects of feed temperature, flow rate and operating time on permeate flux of MEMD module is performed.; High thermal efficiency and GOR found of air gap MEMD module.; Low consumption of specific heat was found in MEMD module.;

Keywords

• electrocoagulation
• gray water
• memd
• membrane distillation
• water treatment