Removals of phenolic compounds and phthalic acid esters in landfill leachate by microbial sludge of two-stage membrane bioreactor

Abstract

Removals of bisphenol A (BPA), 2,6-di-tert-butylphenol (2,6-DTBP), 2,6-di-tert-butyl-4methylphenol (BHT), di-ethyl phthalate (DEP), di-butyl phthalate (DBP) and bis (2-ethylhexyl) phthalate (DEHP) were monitored in two-stage membrane bioreactor (MBR) by operating under no sludge wastage condition for 500 days. Those emerging contaminants were removed by 99.5%, 99.0%, 99.5%, 97.9%, 96.8% and 95.7% under long term operation in MBR without reaching maximum adsorption capacity of sludge. Biodegradation was the main mechanism for their removals in MBR systems and the microbial activities were enhanced by long sludge age operating condition. The removals of those compounds by microbial sludge in MBR by adsorption and combined (adsorption & biodegradation) mechanisms were well explained by pseudo-second order and first order kinetics, respectively.

Removal of refractory organics in nanofiltration concentrates of municipal solid waste leachate treatment plants by combined Fenton oxidative-coagulation with photo – Fenton processes

“…Zheng et al, 2007;Boonnorat et al, 2014). In this investigation 6 PAEs were found in LB-A, and 3 of them, di-ethyl phthalate, di-octyl phthalate and benzyl butyl phthalate, have been listed as priority pollutants by the US Environmental Protection Agency (Table 3).…”

Biodegradation of Dimethyl Phthalate by Freshwater Unicellular Cyanobacteria

“…Unfortunately, these methods are limited in application because of the high cost. In recent years, a number of studies have been carried out to evaluate the degradation of PAEs by bacteria in terrestrial and aquatic ecosystems [12, 21]. Cyanobacteria are a class of autotrophic microorganisms capable of photosynthesis.…”

Removal of phthalic acid dieters with dissolved organic matter by an anaerobic/anoxic/oxic leachate treatment process

“…5,6 Among PAEs, di-n-butyl phthalate (DBP) and di(2-ethylhexyl) phthalate (DEHP) are the most widely used and are considered to be the main substance that produces estrogen in leachate. 7,8 Dissolved organic matter (DOM) in landll leachate is mainly distributed in humic acid (HA), fulvic acid (FA) and hydrophilic organic components (HyI). Research shows that hydrophobic DOM with a molecular weight of 3-14 kDa and less than 600 Da is the primary source of estrogen production in leachate.…”