Effects of salinity build-up on biomass characteristics and trace organic chemical removal: Implications on the development of high retention membrane bioreactors

Abstract

Nghiem, L. D. (2015). Effects of salinity build-up on biomass characteristics and trace organic chemical removal: Implications on the development of high retention membrane bioreactors. Bioresource Technology, 177 274-281.Effects of salinity build-up on biomass characteristics and trace organic chemical removal: Implications on the development of high retention membrane bioreactors AbstractThis study investigated the impact of salinity build-up on the performance of membrane bioreactor (MBR), specifically in terms of the removal and fate of trace organic chemicals (TrOCs), nutrient removal, and biomass characteristics. Stepwise increase of the influent salinity, simulating salinity build-up in high retention MBRs, adversely affected the metabolic activity in the bioreactor, thereby reducing organic and nutrient removal. The removal of hydrophilic TrOCs by MBR decreased due to salinity build-up. By contrast, with the exception of 17α-ethynylestradiol, the removal of all hydrophobic TrOCs was not affected at high salinity. Moreover, salinity build-up had negligible impact on the residual accumulation of TrOCs in the sludge phase except for a few hydrophilic compounds. Additionally, the response of the biomass to salinity stress also dramatically enhanced the release of both soluble microbial products (SMP) and extracellular polymeric substances (EPS), leading to severe membrane fouling. Additionally, the response of the biomass to salinity stress also dramatically enhanced the release of both soluble microbial products and extracellular polymeric substances, leading to severe membrane fouling. Disciplines Engineering | Science and Technology Studies

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

“…Moreover, sludge SOUR decreased, especially within the first two weeks of operation ( Figure 5c). These observations are consistent with previous studies [35,36] and could be attributed to the inhibition of elevated bioreactor salinity on biomass growth and activity. An increase in the osmotic stress could result in the dehydration and plasmolysis of bacterial cells and thus reduce their viability [37].…”

Carbamazepine as a Possible Anthropogenic Marker in Water: Occurrences, Toxicological Effects, Regulations and Removal by Wastewater Treatment Technologies

“…However, CBZ removal by both CAS and MBR has been reported to be poor and unstable (Table 5). Poor removal of CBZ can be attributed to its physicochemical properties such as molecular structure and hydrophilicity [71,134,139,140].…”

Sequential batch membrane bio-reactor for wastewater treatment: The effect of increased salinity

“…However, it is crucial to investigate how biomass kinetics and activated sludge features affect the biological and physical performance of MBRs used to treat saline wastewater. With this in mind, several studies have been recently carried out on MBRs treating saline wastewater (Jang et al, 2013;Johir et al, 2013;Di Trapani et al, 2014;Luo et al, 2015). Jang et al (2013) found a reduction of the ammonia removal and an increase in membrane fouling when treating high salinity wastewater was due to particular features of the microbial http://dx.doi.org/10.1016/j.biortech.2016.02.122 0960-8524/Ó 2016 Elsevier Ltd. All rights reserved.…”

“…Di Trapani et al (2014) compared the performance of a moving bed membrane bioreactor (MB-MBR) with a MBR system subjected to a gradual salinity increase (up to 10 g NaCl L À1 ) and showed an increase of the pore fouling tendency with the increase in salinity in the MBR (Di Trapani et al, 2014). Very recently, Luo et al (2015) investigated the effects salinity has on the characteristics of the biomass and membrane fouling in MBR systems. They found that ammonia removal efficiency decreased considerably at high salinities (P10 g NaCl À1 ), especially immediately after the salinity shock load.…”