Influence of salinity on microorganisms in activated sludge processes: A review
01 Apr 2017-International Biodeterioration & Biodegradation (Elsevier)-Vol. 119, Iss: 119, pp 520-527
TL;DR: In this article, the effect of salinity on activated sludge and its microorganisms was reviewed and the feasibility of treatment of saline wastewater by using the acclimated salt tolerant activated SLudge was evaluated.
About: This article is published in International Biodeterioration & Biodegradation.The article was published on 2017-04-01. It has received 247 citations till now. The article focuses on the topics: Activated sludge & Sewage treatment.
Citations
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TL;DR: The interactions among multiple target pollutants and the changes in the bioavailability and biodegradability of substrates that are responsible for substrate interactions are reviewed, and potential strategies for enhancing biofilter performance are discussed.
185 citations
TL;DR: In this paper, a facile in-situ precipitation method was proposed to simultaneously achieve the small size control of catalyst crystal and improve the photocatalytic performance of catalyst by adding MWCNT and PANI.
Abstract: In this work, novel photocatalysts Ag3PO4@MWCNTs@PANI with excellent visible light photocatalytic performance and photostability were successfully prepared by a facile in-situ precipitation method. The optimal catalyst Ag3PO4@0.1%MWCNTs@3%PANI showed the highest photocatalytic performance for degradation of phenol and p-nitrophenol, the apparent rate constant of which was 21.9 and 10 times than that of the pure Ag3PO4, respectively. Interestingly, the Ag3PO4 exhibited significant changes in particle size, which changed from 10 to 20 μm for pure Ag3PO4 particles into 0.38–1.0 μm and 0.15–0.38 μm with the addition of MWCNTs and PANI, respectively. In presence of MWCNTs, similar phenomena have been reported in our previous studies, while the ability of PANI dissolved in the presence of DMF solvent to control the size of Ag3PO4 crystal was reported for the first time. The dramatic enhancement of photocatalytic activity and photostability could be attributed to the synergetic effect between MWCNTs and PANI on Ag3PO4. The MWCNTs penetrating in the bulk phase of Ag3PO4 could serve as conductors of photogenerated electrons and rapidly migrated electrons to the surface of the photocatalysts. Meanwhile, photogenerated holes in the valence band of Ag3PO4 were transferred to the photocatalysts surface through HOMO of PANI. Consequently, high separation efficiency of electron-hole pairs was successfully achieved. A novel design and preparation strategy for photocatalyst was proposed to simultaneously achieve the small size control of catalyst crystal and improve the photocatalytic performance of catalyst by adding MWCNT and PANI.
165 citations
TL;DR: In this article, the degradation efficiencies and mechanisms of atrazine, a recalcitrant herbicide, were thoroughly investigated using ferrate (Fe(VI))/peroxymonosulfate (PMS) process.
165 citations
TL;DR: Results showed that salinity deteriorated the removal performance, activated sludge characteristics and microbial community in sequencing batch reactors (SBRs) and increased the extracellular polymeric substances (EPS) content ofactivated sludge, decreased the content of protein (PN) and loosely bound extraceocytes (LB-EPS), which led to better settleability of activatedSludge.
158 citations
Cites background or methods from "Influence of salinity on microorgan..."
...When the osmotic pressure above the tolerance of 297 microorganisms, it restrained the normal metabolism and destroyed enzymes 298 including dehydrogenase of microbes (He et al., 2017)....
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...At the same 40 time, the discharge of salt-contained wastewater from industries including chemical 41 industries, pharmaceutical factories and smelteries increases rapidly (He et al., 2017)....
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...49 Treatment processes for saline wastewater can be summarized as 50 physicochemical and biological treatment methods (He et al., 2017)....
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...64 Recently, many investigations focused on developing different treatment 65 methods to improve removal rates (Lefebvre and Moletta, 2006; He et al., 2017)....
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TL;DR: From start-up to stable operation, though the microorganisms in ST were reduced in diversity relative to NT, the proportion of electrochemically active bacteria (EAB), such as Ochrobactrum, significantly increased and gradually predominated in the microbial community.
102 citations
References
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TL;DR: As EPS are very complex, the knowledge regarding EPS is far from complete and much work is still required to fully understand their precise roles in the biological treatment process.
2,260 citations
TL;DR: A unified theory shows that the apparently distinct products from the SMP and EPS schools overlap each other, and shows that Soluble EPS is actually SMP, or the sum of UAP and BAP.
1,137 citations
Book•
01 Apr 1995
TL;DR: In this paper, a detailed presentation of the theories behind modern wastewater treatment processes is given, together with a detailed subject index, to help the reader understand the theories so that the book can serve at the same time as an advanced textbook for graduate students and a handbook for professionals.
Abstract: This book gives a detailed presentation of the theories behind modern wastewater treatment processes. It reflects the new theories for wastewater characterization, process description and modeling, which has been developed internationally during the last 10 years. The information intensity is unique due to the large amount of figures, tables and examples. Together with a detailed subject index, they help the reader understand the theories so that the book can serve at the same time as an advanced textbook for graduate students and a handbook for professionals. Consulting companies will find the book useful as a reference and standard for dealing with wastewater treatment processes at an advanced international level.
1,072 citations
TL;DR: The major need for research in the future will be the combination of physico-chemical/biological treatment of saline industrial effluents, with regard to the global treatment chain, in order to meet the regulations.
1,017 citations
TL;DR: Recent work indicated that bacteria can also use futile cycles of potassium, ammonia, and protons through the cell membrane to dissipate ATP either directly or indirectly, and the utility of energy spilling in bacteria has been a curiosity.
810 citations