Arsenic contamination, impact and mitigation strategies in rice agro-environment: An inclusive insight.

Insights into nitrogen and phosphorus metabolic mechanisms of algal-bacterial aerobic granular sludge via metagenomics: Performance, microbial community and functional genes.

Phosphorus regulates As uptake by rice via releasing As into soil porewater and sequestrating it on Fe plaque

A review on recovery of extracellular biopolymers from flocculent and granular activated sludges: Cognition, key influencing factors, applications, and challenges.

The membrane separation process is sometimes limited in terms of performance; therefore, coupling it with other methods, such as adsorption, can exert a synergistic effect, overcome membrane fouling, and improve energy efficiency, which is especially suitable for separating mixtures. Adsorption and membrane filtration are two well-known separation techniques with several noteworthy characteristics, including a strong scientific foundation, adaptability, simple process management and design, and great capability to remove many impurities. Consequently, these techniques are possible candidates for hybrid systems. This review provides an overview of the most recent studies on adsorption–membrane hybrid systems that use various adsorbents and membranes to remove pollutants from water and wastewater streams. This study examines emerging hybrid adsorption-membrane technologies with different configurations for wastewater treatment, their benefits and drawbacks, hybrid system designs, and their utilization. It discusses the application of various adsorbents in hybrid systems. Finally, it presents recommendations for future research on applying hybrid adsorption-membrane technology to wastewater treatment. The adsorbents have served as "helpers" for the membrane, leading to decreasing the membrane fouling and increasing the flux of permeate at the same time by breaking the formed concentration polarization layer on the surface of the membrane. 

Separation Techniques in Different Configurations of Hybrid Systems via Synergetic Adsorption and Membrane Processes for Water Treatment: A Review

A comparative study on simultaneous recovery of phosphorus and alginate-like exopolymers from bacterial and algal-bacterial aerobic granular sludges: Effects of organic loading rate.

Flue gas desulfurization (FGD) wastewater treatment is currently of interest, as stringent standards have been released in order to limit the pollution emissions from the energy industry, and concerns about water scarcity are also increasing. Reverse osmosis (RO) membrane is a promising alternative for highly efficient FGD wastewater treatment. However, membrane fouling strongly limits its application. This study developed a suitable treatment system by combining RO membrane with ultrasonic cleaning. The introduction of low-frequency and high-intensity ultrasonic cleaning improved the cleaning efficiency of membrane fouling, as the permeate flux recovered 49% of the reduced value within 10 min of cleaning. The lifespan of the membrane was also extended, as the time of permeate flux declined to the same level, increasing from 2 h to 4 h after ultrasonic cleaning. The effluent of the system could meet the standard of desulfurization wastewater treatment. The treatment system is feasible for FGD wastewater treatment at a laboratory scale. These findings proved that the combination of RO membrane and ultrasonic cleaning could be applied to FGD wastewater treatment. The study provided an efficient, cost-saving, and convenient way to develop the FGD wastewater treatment system.

/pdf/reverse-osmosis-membrane-combined-with-ultrasonic-cleaning-mvzs7qm9.pdf

Reverse Osmosis Membrane Combined with Ultrasonic Cleaning for Flue Gas Desulfurization Wastewater Treatment

The iron (Fe) (hydro)oxides deposited around rice roots play an important role in arsenic (As) sequestration in paddy soils, but there is no systematic study on the relative importance of Fe (hydro)oxides on root surface and in rhizosphere soil in limiting As bioavailability. Twenty-seven rice genotypes were selected to investigate effects of Fe (hydro)oxides on As uptake by rice in an alkaline paddy soil. Results indicated that the As content was positively correlated with the Fe content on root surface, and most of As (88–97%) was sequestered by poorly crystalline and crystalline Fe (hydro)oxides in the alkaline paddy soil. The As sequestration by Fe (hydro)oxides on root surface (IASroot 16.8–25.0 mg As/(g Fe)) was much higher than that in rhizosphere (IASrhizo 1.4–2.0 mg As/(g Fe)); therefore, in terms of As immobilization, the Fe (hydro)oxides on root surface were more important than that in rhizosphere. However, the As content in brown rice did not have significant correlation with the As content on root surface but was significantly correlated (R2 = 0.43, P < 0.05) with the partition ratio (PRAs = IASroot/IASrhizo) of As sequestration on root surface and in rhizosphere, which suggested that Fe (hydro)oxides on root surface did not play the controlling role in lowering As uptake, and the partition ratio PRAs would be a better indicator to evaluate effects of Fe (hydro)oxides around roots on As uptake by rice.

Comparative effects on arsenic uptake between iron (hydro)oxides on root surface and rhizosphere of rice in an alkaline paddy soil

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A comparative study on simultaneous recovery of phosphorus and alginate-like exopolymers from bacterial and algal-bacterial aerobic granular sludges: Effects of organic loading rate.

Reverse Osmosis Membrane Combined with Ultrasonic Cleaning for Flue Gas Desulfurization Wastewater Treatment

Comparative effects on arsenic uptake between iron (hydro)oxides on root surface and rhizosphere of rice in an alkaline paddy soil