Biotreatment of high-salinity wastewater: current methods and future directions

Zhao, Yixi; Zhuang, Xuming; Ahmad, Shakeel; Sung, Shihwu; Ni, Shou‐Qing

doi:10.1007/s11274-020-02815-4

Cited by 90 publications

(50 citation statements)

References 92 publications

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“…mediterranei has several remarkable characteristics: it grows on defined media or complex media and is able to use a wide variety of carbon sources [8,9]; it has better growth rates than other known members of the Halobacteriaceae family [10,11]; it has a wide range of salt tolerance [12]; and its growth can be aerobic or anaerobic using different organic and inorganic sources [13]. Thanks to all these advantages, it is interesting to expand the knowledge on this organism and to find biotechnological and industrial interest applications because of its capacity to produce secondary metabolites [14,15]; environmental interest is also relevant including bioremediation of saline wastewaters generated from chemical, pharmaceutical, agricultural, and aquicultural industries [16][17][18]. Moreover, previous studies have shown that this haloarchaeon could be an attractive microorganism in terms of bioremediation as it can grow in areas with high salinity, nitrate, and nitrite to repair the damage caused by the excessive use of fertilizers used in agriculture [19].…”

Section: Introductionmentioning

confidence: 99%

The Survival of Haloferax mediterranei under Stressful Conditions

et al. 2021

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Haloarchaea can survive and thrive under exposure to a wide range of extreme environmental factors, which represents a potential interest to biotechnology. Growth responses to different stressful conditions were examined in the haloarchaeon Haloferax mediterranei R4. It has been demonstrated that this halophilic archaeon is able to grow between 10 and 32.5% (w/v) of sea water, at 32–52 °C, although it is expected to grow in temperatures lower than 32 °C, and between 5.75 and 8.75 of pH. Moreover, it can also grow under high metal concentrations (nickel, lithium, cobalt, arsenic), which are toxic to most living beings, making it a promising candidate for future biotechnological purposes and industrial applications. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis quantified the intracellular ion concentrations of these four metals in Hfx. mediterranei, concluding that this haloarchaeon can accumulate Li+, Co2+, As5+, and Ni2+ within the cell. This paper is the first report on Hfx. mediterranei in which multiple stress conditions have been studied to explore the mechanism of stress resistance. It constitutes the most detailed study in Haloarchaea, and, as a consequence, new biotechnological and industrial applications have emerged.

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Section: Introductionmentioning

confidence: 99%

The Survival of Haloferax mediterranei under Stressful Conditions

et al. 2021

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“…In this case, the sludge settleability was scarcely affected by the salt presence. The conventional CAS systems can be directly used to treat wastewater with salinities below 10 g NaCl/L, while the aerobic systems based in biofilms seem to be able to tolerate higher salt concentrations, because of their large biomass retention capacity (Zhao et al, 2020).…”

Section: Biological Technologies 431 Overview Of Conventional Treatmentsmentioning

confidence: 99%

Technologies for the treatment of saline wastewater

2021

Treatment and Valorisation of Saline Wastewater: Principles and Practice

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The existing technologies applied nowadays for the treatment of saline wastewater are presented and evaluated including physical-chemical and biological processes. Among the physical-chemical processes are conventional units like dissolved air coagulation-flocculation tanks, and advanced oxidation processes where salt is not removed. Also, those processes focused on salt removal are tackled including membranes, evaporation systems, and crystallization. Salinity is responsible for the increased requirements of reagent addition during coagulation-flocculation of tertiary treatments, which incur increased operational costs. In the case of biological systems, those based on suspended and adhered biomass are considered. In general, high salt concentrations inhibit the activity of the bacterial populations responsible for the main biological processes. However, biofilm systems are supposed to be more resistant to the presence of potential inhibitors such as salts. Thus, innovative technologies based on granular/biofilm biomass are currently under study. In addition, physical-chemical processes for the separation of salts from wastewater are reviewed here.

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“…Due to its low cost in sewage treatment, this method is preferred and most commonly used in sewage treatment schemes. It is also the most promising method in the treatment of high-salt wastewater 5,6). However, when the organic wastewater with high salinity is post-treated by biochemical methods, the high salinity has a strong inhibitory effect on the growth of microorganisms and reduces the treatment effect.…”

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confidence: 99%

Analysis of Key Technologies for Industrialized Treatment of Fatty Acid High-Salinity Organic Wastewater

Lu¹,

Jeong²,

Yan³

et al. 2020

J Korean Soc Environ Eng

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Objectives : Wastewater produced by fatty acid production contains high concentration of organic substances and high concentration of salts (mainly sodium sulfate), causing great pollution to water resources and environment. The pollution prevention and control of this type of wastewater are very necessary. The key to treating this type of wastewater is to remove salts and COD to achieve harmless treatment. This is a problem in wastewater management that has plagued the industry for a long time. This paper proposed a technique suitable for fatty acid high salinity organic wastewater.Methods : First, the industrial treatment technology of organic wastewater with high salinity was introduced and analyzed. Combined with the principle of industrial wastewater treatment, the process route for the treatment of fatty acid high salinity organic wastewater was analyzed and selected. In addition, the key technology and process for anaerobic desalination and COD removal were analyzed and selected.Results and Discussion : According to the unique nature of this type of wastewater mainly containing sulphate salts and the feasibility of industrial production, a special technology combination was proposed to treat this wastewater at this stage. Since this wastewater has a B/C ratio of 0.4 to 0.45, it is easier to use biological treatment method. Thus, the conventional treatment method is pretreatment + biological treatment. Biological enhancement and reactor process optimization can be studied for better efficiency.Conclusions : Considering the high COD and sulphate concentration characteristics of fatty acid high-salinity organic wastewater, high-efficiency anaerobic biochemical treatment is mainly considered. Combined with modern high-efficiency anaerobic suspended sludge granule technology, it was concluded that pretreatment + high efficiency IC anaerobic + secondary biological treatment can achieve industrialized treatment of such wastewater in a targeted, low-cost and reliable way. In the later stage, bio-enhancement of the anaerobic process as well as structural and process optimization of the reactor can be carried out to obtain better technical and economic results in production practice.

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Biotreatment of high-salinity wastewater: current methods and future directions

Cited by 90 publications

References 92 publications

The Survival of Haloferax mediterranei under Stressful Conditions

The Survival of Haloferax mediterranei under Stressful Conditions

Technologies for the treatment of saline wastewater

Analysis of Key Technologies for Industrialized Treatment of Fatty Acid High-Salinity Organic Wastewater

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