Preparation of combined hydrogel solution that is suitable to control the emission of odor pollutants from brownfield site and its control effects.

Abstract

Odor pollution caused by brownfield site has attracted increasing attention. However, to date, fewer suitable materials can be used to control the emission of odor pollutant from brownfield site during remediation. This study prepared a kind of combined hydrogel solution based on sodium alginate and carboxymethyl cellulose sodium (CHS-SC) and tested the possibility of its membrane in controlling the emission of three odor pollutants (trichloroethylene, dimethyl disulfide, and p-xylene) from polluted soil. Our results showed that CHS-SC membrane could effectively control the emission of three odor pollutants from polluted soil. Comparatively, CHS-SC membrane had higher control rates for three odor pollutants at high ambient temperature (32°C), short storage time of CHS-SC (5days, 25°C), and low odor pollutant concentration (2ml/kg soil) than at low ambient temperature (2°C), long storage time of CHS-SC (10 d, 25°C), and high odor pollutant concentration (4ml/kg soil), respectively. CHS-SC membrane was degraded by 79.23% after 150days in soil and slightly changed soil bacterial community, indicating that it had good biodegradability and environmental friendliness. In addition, CHS-SC cost was the lowest among the products with similar function. This study shows that CHS-SC is effective in short-timely controlling the emission of odor pollutants from brownfield site.