Removal of pharmaceuticals, steroid hormones, phytoestrogens, UV-filters, Removal of pharmaceuticals, steroid hormones, phytoestrogens, UV-filters, industrial chemicals and pesticides by Trametes versicolor: role of biosorption industrial chemicals and pesticides by Trametes versicolor: role of biosorption and biodegradation and biodegradation

Nghiem, L. D. (2013). Removal of trace organic contaminants by an MBR comprising a mixed culture of bacteria and white-rot fungi. Bioresource Technology, 148 (November), 234-241. Removal of trace organic contaminants by an MBR comprising a mixed culture of bacteria and white-rot fungi AbstractThe degradation of 30 trace organic contaminants (TrOC) by a white-rot fungus-augmented membrane bioreactor (MBR) was investigated. The results show that white-rot fungal enzyme (laccase), coupled with a redox mediator (1-hydroxy benzotriazole, HBT), could degrade TrOC that are resistant to bacterial degradation (e.g. diclofenac, triclosan, naproxen and atrazine) but achieved low removal of compounds (e.g. ibuprofen, gemfibrozil and amitriptyline) that are well removed by conventional activated sludge treatment. Overall, the fungus-augmented MBR showed better TrOC removal compared to a system containing conventional activated sludge. The major role of biodegradation in removal by the MBR was noted. Continuous mediator dosing to MBR may potentially enhance its performance, although not as effectively as for mediator-enhanced batch laccase systems. A ToxScreen3 assay revealed no significant increase in the toxicity of the effluent during MBR treatment of the synthetic wastewater comprising TrOC, confirming that no toxic by-products were produced. 2013 Elsevier Ltd. Abstract:The degradation of 30 trace organic contaminants (TrOC) by a white-rot fungus-augmented membrane bioreactor (MBR) was investigated. The results show that white-rot fungal enzyme (laccase), coupled with a redox mediator (1-hydroxy benzotriazol, HBT), could degrade TrOC that are resistant to bacterial degradation (e.g. diclofenac, triclosan, naproxen and atrazine) but achieved low removal of compounds (e.g. ibuprofen, gemifibrozil and amitriptyline) that are well removed by conventional activated sludge treatment. Overall, the fungus-augmented MBR showed better TrOC removal compared to a system containing conventional activated sludge.The major role of biodegradation in removal by the MBR was noted. Continuous mediator dosing to MBR may potentially enhance its performance, although not as effectively as for mediator-enhanced batch laccase systems. A ToxScreen3 assay revealed no significant increase in the toxicity of the effluent during MBR treatment of the synthetic wastewater comprising TrOC, confirming that no toxic by-products were produced.

16The effects of controlled temperature variation in the range of 10 -45 C were assessed in a 17 lab-scale MBR that treated synthetic municipal wastewater spiked with selected 18 micropollutants. The effects were evaluated with respect to total organic carbon (TOC) and 19 total nitrogen (TN) removal, micropollutant removal, sludge growth, level of soluble 20 microbial products (SMP) in the mixed liquor and membrane fouling. Overall, the 21 temperature shifts caused high variation in the TOC and TN levels in the reactor supernatant, 22however that in membrane-permeate was relatively more stable, substantiating the robustness 23

A novel enzymatic membrane reactor (EMR) was explored for continuous removal of two trace organic contaminatnts (TrOCs) ubiquitously detected in wastewater-namely bisphenol A (BPA and diclofnac (DCF)-by a commercially available laccase from aspergillus oryzae.

Despite of their low concentration, the impact of steroid estrogens such as estrone, 17βestradiol and ethinylestradiol are often more serious than other synthetic endocrinedisrupting chemicals (EDCs) since their endocrine-disrupting potency is much higher. While their existence in waterways is of increasing concern, nanofiltration (NF) and reverse osmosis (RO) are likely to play an important role in removal of these compounds. This paper describes the mechanisms involved in the retention of estrogen estrone using NF and RO. NF/RO membranes may adsorb trace contaminant estrone, which may result in an initially high retention. If the pore size of the membranes is larger than the estrone molecules, breakthrough can be observed when the membrane adsorptive sites are saturated. Although there is negligible effect of ionic strength on estrone adsorption by the membrane, it is strongly influenced by pH near the pKa value of estrone (10.4). While static adsorption experiments give a linear adsorption isotherm, higher estrone adsorption in the filtration process with a large pore size membrane (TFC-SR2) suggests that adsorption can also occur inside the membrane active layer. Depending on the pore size to molecule size ratio, the transport of trace organics across the membrane active layer can be described as diffusive and/or convective. A modified diffusion model is proposed to assess the degree of diffusive to convective transport of trace contaminant estrone across the membrane.