Adsorption of dyes using magnesium hydroxide-modified diatomite

Lin, Jianwei; Wang, L.

doi:10.5004/dwt.2009.786

Cited by 37 publications

(13 citation statements)

References 24 publications

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“…This can be explained based on two reasons: (i) part of the ammonium was converted to the atmosphere in the form of NH 3(g) and (ii) according to the solubility product calculation, struvite, Mg(OH) 2(s) and MgCO 3(s) are the three possible precipitation species in this system. With a pH zpc of 12 for Mg(OH) 2(s) , Mg(OH) 2(s) surface is positively charged for pH < 12. Therefore, some of the PO 4 3− ions also were adsorbed on the surface of the Mg(OH) 2(s).…”

Section: Resultsmentioning

confidence: 99%

Mesophilic microfiltration–anaerobic osmotic membrane bioreactor–membrane distillation hybrid system for phosphorus recovery

Chang

Chen

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND For the first time, a closed‐loop anaerobic osmotic membrane bioreactor–membrane distillation (AnOMBR‐MD) hybrid system integrated with periodic microfiltration (MF) extraction was investigated for simultaneous nutrient and energy recovery while maintaining high water quality for reuse. In addition, phosphorus (P) was recovered as a valuable material for agricultural purposes. RESULTS The AnOMBR‐MD system exhibited excellent nutrient (>99.9%) and organic removal (almost 100%) due to double‐layer filtration (FO and MD membrane). Moreover, higher methane production (0.24 L CH4/g COD) was achieved from the MF‐AnOMBR process to supply a heat source for MD during the draw solution recovery process to reduce energy consumption. The MF permeate can significantly reduce the scaling potential caused by PO43− ions in bulk solution and mitigate salt accumulation in the anaerobic reactor. The P from the MF permeate was effectively recovered with an efficacy of 60 mg L−1 when the solution pH was adjusted to 12. CONCLUSION The overall performance of the MF‐AnOMBR‐MD hybrid system using 1.5 mol L−1 MgSO4 as the draw solution demonstrates its potential application in wastewater treatment with high nutrient recovery in the closed‐loop system. Moreover, this system combined with MD in AnOMBR for draw solution recovery could achieve low energy consumption when its biogas production is utilized as heat source from the anaerobic system. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Mesophilic microfiltration–anaerobic osmotic membrane bioreactor–membrane distillation hybrid system for phosphorus recovery

Chang

Chen

et al. 2018

J of Chemical Tech & Biotech

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“…At equilibrium a relationship exists between the concentration of the species in solution, C , and the "concentration" of the same species in the adsorbed state X M (i.e., the amount of species adsorbed per unit mass of adsorbent) [22]- [24]. The adsorption equilibrium relates X M to C .…”

Section: Resultsmentioning

confidence: 99%

Removal of Manganese and Iron from Groundwater in the Presence of Hydrogen Sulfide and Ammonia

Vidovič¹,

Trajković²,

Rogan³

et al. 2014

JWARP

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Presence of iron and manganese in water not only affects the organoleptic properties of water, but also can cause a number of problems in drinking water treatments. Their removal in drinking water preparation processes becomes more complicated in the presence of hydrogen sulfide and ammonia in water. There are certain commercialized products at the market that are used for removal of manganese, iron and ammonia, but it is of crucial importance to establish an appropriate order of removal in the technological process during drinking water treatment. Through the various combinations of commercialized filtration media, the removal of iron, manganese, hydrogen sulfide and ammonia, was being examined and on the basis of obtained results their effectiveness was estimated. Research results have shown that hydrogen sulfide is pollutant that causes problems during the adsorption in removing manganes. Ammonia, which is bonded to hydrogen sulphide influences the volume of treated water when it comes to removing the iron and manganese. Decrease in the concentration of hydrogen sulfide at the entrance to Filtersorb FMH for four times, has led to an increase in the volume of treated water in the amount of two times, followed by the breakthrough point of concentration of manganese. For complete usage capacity of commercialized products for the removal of these pollutants, finding their mutual bond in compounds which are present in the water, is of the importance.

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“…According to the works of many researchers, the theory of adsorption interactions can be applied to describe the process of water treatment with mineral coagulants (Al-Qodah, 2000;Abdel-Fatah et al, 2015). The Langmuir isotherm equation, which reflects the sorption process in a wide range of their concentrations, was assumed as the main equation for describing the process of extraction of pollutants (Lin & Wang 2009;Ayari et al, 2008):…”

Section: Introductionmentioning

confidence: 99%

Wastewater treatment by coagulatıon wıth countercurrent sludge return

Alekseev

2020

RDLUZ

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Industrial wastewater contains pollutants that do not oxidize under the biological wastewater treatment conditions of populated areas. The treatment of wastewater containing persistent organic substances can be effective in its extraction. Using only water treatment separation methods does not provide sufficient efficiency. Significantly better results are obtained by combining the persistent organic pollutant coagulation method with subsequent separation processes. The disadvantage of coagulation is the need to use large doses of reagents and a large number of wastewater treatment processes. The objective of the research was to determine the possibility of reducing the doses of mineral coagulants and related reagents while maintaining sufficient efficiency in the treatment of contaminant water by countercurrent transfer of the solid phase of the sludge to the previous separation stages. . For the experimental investigation, a facility was used, which included a three-section block of sedimentation chambers, equipment for the manufacture and dosage of reagents, devices for pumping sludge and water sampling. The research was carried out in aqueous solutions of contaminants: persistent synthetic dyes used in the textile industry. The concentration of the dye solutions was assumed to be constant, equal to 150 mg / l. Three series of experiments were carried out with different conditions to dose the coagulant and return the hydroxyl mud. The results of the experiments were analyzed using the Langmuir adsorption equation and the graphical constructions of the equilibrium and the lines of work of the contaminant extraction process. Compared to the traditional single-stage coagulation scheme, which includes a single addition of reagents without reusing the sludge, the use of solid-phase countercurrent transfer coagulation schemes was found, based on the research results. of sludge conductors gives a significant reduction in the number of reagents consumed and, consequently, a decrease in the amount of sludge removed.

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Adsorption of dyes using magnesium hydroxide-modified diatomite

Cited by 37 publications

References 24 publications

Mesophilic microfiltration–anaerobic osmotic membrane bioreactor–membrane distillation hybrid system for phosphorus recovery

Mesophilic microfiltration–anaerobic osmotic membrane bioreactor–membrane distillation hybrid system for phosphorus recovery

Removal of Manganese and Iron from Groundwater in the Presence of Hydrogen Sulfide and Ammonia

Wastewater treatment by coagulatıon wıth countercurrent sludge return

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