Removing crotamiton from reverse osmosis concentrate by using coagulation and a rotating advanced oxidation contactor

Abstract

A novel rotating advanced oxidation contactor (RAOC) equipped with a composite titanium dioxide–zeolite sheet was used to remove the antipruritic agent crotamiton from reverse osmosis concentrate with coagulation as a pretreatment. Coagulation was more efficient at pH 5 in terms of reducing total organic carbon and light absorbance, and the efficiency of coagulation improved with an increase in polymeric aluminum dosage from 0 to 6 mmol/L Al3+. The RAOC performed well in adsorbing crotamiton without obvious inhibition by other components in the reverse osmosis concentrate, and a majority of the crotamiton was removed after 6 h, resulting in the purification of the treated solution. With ultraviolet irradiation, crotamiton was simultaneously removed through adsorption and photocatalysis by the RAOC. The behavior of the main degradation intermediates of crotamiton during treatment showed that the degradation intermediates were also captured by the composite sheet. Coagulation followed by treatment with the RAOC was effective in the removal of organic matter in the RO concentrate and in the photocatalytic degradation of crotamiton.

Inactivation of Plant Pathogenic Bacterium Ralstonia Solanacearum in Drainage Solution from Hydroponic System by a Rotating Advanced Oxidation Contactor Equipped with Tio2/Zeolite Composite Sheets

“…The RAOC shows excellent performance for removing trace organic contaminants from actual wastewater and greatly mitigates the inhibitory effects of coexisting substances in addition to light attenuation as the photocatalysis is performed in an extremely thin water film [40,41]. We have found that water temperature and UV intensity are key factors for controlling the performance of RAOC treatment [41,42], and this technology is expected to be cost-effective and energy-saving for treatment of organic contaminants in reverse osmosis concentrate from water reuse [43,44]. The RAOC is an upscalable reactor and applicable to actual wastewater treatment systems to remove trace organic contaminants.…”

Sustainable future: Resource recovery and concentrate management—An introduction

“…evaluates the need to have appropriate integrated solid waste management in order to recover resources and energy as well as to reduce greenhouse gas emissions. Next article(Xiang et al, 2021) discuss a novel Environ Qual Manage. 2021;31:5-7.© 2021 Wiley Periodicals LLC 5 wileyonlinelibrary.com/journal/tqem technique that combines adsorption and photocatalysis to degrade pollutants present in reverse osmosis concentrates.…”