Biofiltration technology for the removal of toluene from polluted air usingStreptomyces griseus

Abstract

Biofiltration technology has been recognized as a promising biotechnology for treating the volatile organic compounds (VOCs) present in polluted air. This study aims to investigate the performance of a biofiltration system of Streptomyces griseus sp. DSM-40759 immobilized on activated carbon (PICA S23) towards the adsorption and degradation of toluene vapour as well as to regenerate the activated carbon in situ. The batch studies were performed using nutrient agar medium and basal salt medium (BSM) for microbial growth. Initially the pre-cultures were incubated at a temperature of 28°C on a rotary shaker at 150 rpm. After two days, the strain S. griseus DSM-40759 was immobilized on a known weight of activated carbon (12 g). The results of biofilter performance showed three different stages with a quick adsorption phase with approximately 95% of toluene removal after 70 min, a slow biotransformation phase by immobilized cells. In the later, the removal efficiency decreased significantly with the extension of time and reached 60% during this stage. Moreover, a final quick removal phase by the immobilized cells had an average removal efficiency of toluene around 95% after 500 min. The toluene degradation was found to be more than 84% after the second cycle and the biofilter was still capable of removing additional toluene. Thus, the results demonstrated the feasibility and reusability of a new biofilter system for toluene removal as well as extending the activated carbon's capacity and this could be a potential solution to reuse the activated carbon in industrial application.

Petroleum hydrocarbon contamination, plant identity and arbuscular mycorrhizal fungal (AMF) community determine assemblages of the AMF spore‐associated microbes

“…This was expected, since several studies have reported that Streptomyces sp. may grow in PHP contaminated soils and are able to breakdown several recalcitrant petroleum hydrocarbons, such as phenanthrene, pyrene and naphthalene (Balachandran et al, 2012;Bourguignon et al, 2014;Mohamed et al, 2015). Interestingly, Gammaproteobacteria (represented mainly by the genus of Pseudomonas) was found in high proportions in both LC (60.69%) and HC (51.43%) sites.…”

A comparison of biofiltration performance based on bacteria and fungi for treating toluene vapors from airflow

“…All other chemicals were purchased from Merck (Germany). The mineral salt medium (MSM) used for irrigation in both biofilters was prepared according to Mohamed et al (2016). The airflow was supplied by a variable-speed model HVDLT-MK2 from SMAKN-CO England.…”

“…These efficiency values were maintained during the first phases since the BFs were aerated at night (during the experiments) for 12 h with the minimum flow and pollutant concentration. This can regenerate the removal of additional toluene (Mohamed et al 2016). Ondarts et al (2012) showed that the compost was a poor adsorbent (3 × 10 − 3 μg/g) when they were used for toluene treatment at a concentration of 81 μg/m 3 (Ondarts et al 2012).…”

“…Toluene is widely used in the chemical industry and many operations. Even at low concentrations it can damage the liver and kidneys and cause adverse effects on the central nervous system and the genes (Dehghani et al 2019;Hazrati et al 2016a, b;Mohamed et al 2016;Moro et al 2012). Toluene is also considered as one of the most difficult VOCs for bio-degradation in gas streams (Hazrati et al 2015;Wang et al 2013;Zhao et al 2014).…”

Coupling of Solvent Extraction and Ultrasonic Waves for Regeneration of Spent Activated Carbon after Treatment of Polluted Air with Toluene Vapor

“…In addition, as a great many people invest the lion's share of energy inside, the indoor introduction assumes a critical part in the general individual presentation and along these lines in any well-being hazard evaluation. Activated carbon adsorption is the most effective technology for removing trace contaminants from both air and water (Mohamed et al, 2011(Mohamed et al, , 2015(Mohamed et al, , 2016a. On one hand, the utilization of activated carbons as adsorbents is restricted by the issue related to their recovery.…”