Silica removal with sparingly soluble magnesium compounds. Part II

Latour, Isabel; Miranda, Rubén; Blanco, Ángeles

doi:10.1016/j.seppur.2015.05.037

Cited by 18 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also with the use of NaOH, there has been no significant Mg 2þ and SiO 2 removal. The optimum pH level was found to be using Ca(OH) 2 at pH 11.5, in terms of removal efficiency of Ca 2þ , Mg 2þ , and SiO 2 (Latour et al 2015).…”

Section: Softening Studiesmentioning

confidence: 99%

“…For SiO 2 removal during the softening treatment, two main mechanisms were regarded; precipitation as calcium and/or magnesium silicate or by adsorption (Latour et al 2015). Precipitation as magnesium silicate is dominant at high pH (Rioyo et al 2018).…”

Section: Silica Removal Studiesmentioning

confidence: 99%

“…Recent literature studies show that 80-90% SiO 2 removal can be obtained by adding MgCl 2 •6H 2 O and MgSO 4 •7H 2 O at a high pH level with high dosages of chemicals (1,500 mg/L) at ambient temperature (Latour et al 2014a). However, adding these Mg 2þ compounds causes an increase in the conductivity of the ROC (Latour et al 2015). In this study, a sparingly soluble Mg 2þ compound (MgO) was used for SiO 2 removal.…”

Section: Silica Removal Studiesmentioning

confidence: 99%

See 2 more Smart Citations

A study of inline chemical coagulation/precipitation-ceramic microfiltration and nanofiltration for reverse osmosis concentrate minimization and reuse in the textile industry

Çelebi

Dilaver

Kobya

2021

Water Science and Technology

View full text Add to dashboard Cite

Reverse osmosis concentrate (ROC) is one of the major drawbacks in membrane treatment technologies specifically due to the scale-forming ions. It is important to remove these ions from ROC to enhance total water recovery and reuse in the textile industry that is the largest water-consumer and polluter industry. In this work, coagulation/high pH precipitation (CP) integrated with ceramic microfiltration (CMF) was studied as a pretreatment method followed by nanofiltration (NF) to increase the efficiency of water recovery. To prevent organic fouling, ferric chloride (FeCl3) was applied at a concentration of 3 mM, and ceramic membranes were used for the removal of non-precipitating crystals and/or suspended solids (at high pH) before the NF processes. The CP-CMF method successfully removed calcium (Ca2+), magnesium (Mg2+), silica (SiO2), and TOC up to 97, 83, 92, and 87% respectively, which resulted in higher performance of the NF process. Moreover, this method provided higher flux at lower pressure that ultimately increased overall water recovery of the NF process to achieve near-zero liquid discharge (n-ZLD). A cost-benefit estimation showed that a high-quality effluent (COD<5 mg/L; conductivity 700<μS/cm; negligible residual color) can be generated and recycled in the textile industry at an economical cost (approximately 0.97 USD/m3). Therefore, ROC minimization and water recovery can help to achieve n-ZLD using CP-CMF/NF method.

show abstract

Section: Softening Studiesmentioning

confidence: 99%

Section: Silica Removal Studiesmentioning

confidence: 99%

Section: Silica Removal Studiesmentioning

confidence: 99%

See 1 more Smart Citation

A study of inline chemical coagulation/precipitation-ceramic microfiltration and nanofiltration for reverse osmosis concentrate minimization and reuse in the textile industry

Çelebi

Dilaver

Kobya

2021

Water Science and Technology

View full text Add to dashboard Cite

show abstract

“…Among other possible damages to reactors, these two constituents can result in corrosion, scale deposition, fouling in membranes and boiler water solutes in steam if they are not kept within the necessary threshold range (Adeniyi and Ighalo 2020;Jami et al 2013). Several processes have been adopted for removal of silica and TDS (Basha et al 2008;Broséus et al 2009;Latour et al 2014Latour et al , 2015Lee et al 2008;Sik Ali et al 2004;Weeks et al 1992). Overall, some of these methods are efficient, but each one of them has their limitations ranging from process complexities to cost implications.…”

Section: Introductionmentioning

confidence: 99%

Auto-correlation robustness of factorial designs and GAMS in studying the effects of process variables in a dual-objective adsorption system

Amosa¹,

Aderibigbe

Adeniyi

et al. 2021

Appl Water Sci

View full text Add to dashboard Cite

The performance of factorial designs is still limited due to some uncertainties that usually intensify process complexities, hence, the need for inter-platform auto-correlation analyses. In this study, the auto-correlation capabilities of factorial designs and General Algebraic Modeling System (GAMS) on the effects of some pertinent operating variables in wastewater treatment were compared. Individual and combined models were implemented in GAMS and solved with the trio of BARON, CPLEX and IPOPT solvers. It is revealed that adsorbent dosage had the highest effect on the process. It contributed the most effect toward obtaining the minimum silica and TDS contents of 13 mg/L and 814 mg/L, and 13.6 mg/L and 815 mg/L from factorial design and GAMS platforms, respectively. This indicates a concurrence between the results from the two platforms with percentage errors of 4.4% and 0.2% for silica and TDS, respectively. The effects of the mixing speed and contact time are negligible.

show abstract

“…The equilibrium concentration of dissolved silica depends on the temperature, pH and chloride ion concentration in a solution [11], and silica scale is sometimes diminished by avoiding supersaturation or by adding chemical inhibitors [12,13]. Al(OH) 3 [14], magnesium salt [15,16], silica gel seeds [17] and other chemicals [18,19] have also been used to induce the precipitation of silica. In addition, Gabelich et al [20] reported that increasing the pH of an ionic solution effectively induces the precipitation of silica, with significant removal of silica above a pH of 10.…”

Section: Introductionmentioning

confidence: 99%

Preventing Silica Scale Formation Using Hydroxide Ions Generated by Water Electrolysis

Sano

Yamaguchi

2019

Membranes

View full text Add to dashboard Cite

The reaction of silica with various cations in a solution and with hydroxide ions generated by water electrolysis was investigated as a means of preventing the formation of silica scales in geothermal binary power generation. Through batch and continuous experiments, it was found that all silica in the cathode phase of a reaction device could be removed if the necessary amounts of magnesium and calcium were present. This occurs because a silica-magnesium-calcium compound is produced via a polymerization reaction with cations in a solution and with hydroxide ions generated by electrolysis. Analysis by inductively coupled plasma and energy dispersive X-ray spectroscopy shows that this material has the formula 2CaO-5MgO-8SiO2-H2O, and thus is likely generated by the reaction proposed by Sheikholeslami et al. (2019). Increasing the current sent through the reaction solution subsequently produces calcium carbonate. This technique for the separation of silica and calcium from aqueous solutions can be operated continuously without channel clogging, which indicates the possibility of practical applications. However, overly high currents promote the migration of protons from the anode to cathode phases, which inhibits the formation of precipitates due to a neutralization reaction. The proposed method is an effective approach for removing silica from a solution in geothermal binary power generation; although, a means of suppressing the effects of proton generation will be necessary if the process is also to be used to remove calcium ions.

show abstract

Silica removal with sparingly soluble magnesium compounds. Part II

Cited by 18 publications

References 15 publications

A study of inline chemical coagulation/precipitation-ceramic microfiltration and nanofiltration for reverse osmosis concentrate minimization and reuse in the textile industry

A study of inline chemical coagulation/precipitation-ceramic microfiltration and nanofiltration for reverse osmosis concentrate minimization and reuse in the textile industry

Auto-correlation robustness of factorial designs and GAMS in studying the effects of process variables in a dual-objective adsorption system

Preventing Silica Scale Formation Using Hydroxide Ions Generated by Water Electrolysis

Contact Info

Product

Resources

About