Flame retardants for polymers
Ecopiren in PVC wire and cable formulations Ecopiren in halogen-free wire and cable formulations Ecopiren in polyamide compounds Ecopiren as ATH replacement Ecopiren in ACP
- Metallurgical fluxFlux for steelmaking in converter Flux for steelmaking in Electric arc furnace
- Waste water and gas treatmentPrimary and secondary treatment Odor control and sludge dewatering Gas purification Gas desulfurization
- Technical rubber products
- Component for glass production
- Magnesium hydroxide in the pulp and paper industryChemical pulping Reagent for pulp bleaching Mechanical pulp bleaching
- Anti-caking agent for mineral fertilizersAnti-caking agent for ammonium nitrate Anti-caking agent for complex fertilizers
- FertilizersMagnesium fertilizer (improver) Liquid complex fertilizers
- Animal FeedMagnesium additive in feed for cattle Magnesium additive in feed for pigs
- Component for the production of magnesium productsMain page /Ranges of application / Waste water and gas treatment / Reagent for acid sewages neutralization
Primary and secondary treatment
MagTreat® is a natural reagent for wastewater treatment. It can be effectively used in primary and secondary treatment processes. Acting like a soft alkali, MagTreat® is safer and more effective than any of existing industrial alkalis. It can be applied on each stage of sewages purification, improving the perfomance of a whole process.
Acid sewages neutralization
Due to lower molecular weight magnesium hydroxide provides more hydroxyl ions than hydrated lime and more than monovalent caustic soda per kg. One mt of NaOH is equivalented to 0.73 mt Mg(OH)2 and one mt of Ca(OH)2 is equivalented to 0.79 mt Mg(OH)2. It is vividly illustrated by dissociation reactions*:
2NaOH ó 2Na+ + 2OH-
2(40)g/mol ó 2(23)g/mol + 2(17)g/mol
Ca(OH)2 ó CaOH+ + OH- ó Ca2+ + 2OH-
(74)g/mol ó (57)g/mol + (17)g/mol ó (40)g/mol + 2(17)g/mol
Mg(OH)2 ó MgOH+ + OH- ó Mg2+ + 2OH-
(58)g/mol ó (41)g/mol + (17)g/mol ó (23)g/mol + 2(17)g/mol
*On dry solids basis
Unlike many commonly used chemicals as hydrated lime or caustic soda, MagTreat® gradually neutralizes acids reaching the maximum pH level of 9-9,5 forming safe buffer solutions. Also, there is no exceeding calorification during neutralization process. MagTreat® is effective in neutralization of both inorganic and organic acids:
- Sulfuric acid
- Hydrochloric acid
- Phosphoric acid
- Nitric acid
- Acetic acid
MagTreat® allows to prevent scaling of the equipment in reaction with sulphuric acid and phosphoric acid. It forms products that can be easily removed out of the system - magnesium sulphate and struvite (Treated water is enriched with magnesium ions and have pH level supportable for the next stage of wastewater treatment.
Heavy metals reduction
MagTreat® helps to reduce concentration of ions to the values of the MPC, while treatment of wastewaters with high content of heavy metals.
When added to a system MagTreat® acts like an alkali and a sorbent at the same time. It precipitates heavy metal ions as hydroxides which form colloid suspensions. It effectively removes such dangerous elements as copper, lead, cadmium, zinc, chromium, etc.
Mg(OH)2 ↔ Mg2+ + 2OH- Me2+ + 2OH- = Me(OH)2 ↓where Me2+ — ions Fe2+, Cu2+, Ni2+, Zn2+, etc.
At the same time MagTreat® absorbs heavy metals, thanks to its high specific surface area about 11 m2/g. The absorption capacity of natural magnesium hydroxide is comparable to the absorption capacity of synthetic ion-exchange materials.
Biological wastewater treatment
MagTreat® can be used for secondary water treatment – nitrification/denitrification process. It helps to maintain the optimal pH level for bacteria reproduction. Biological wastewater treatment could be performed either as a joint process of aerobic-anaerobic treatment by activated sludge, or as a two separate processes: nitrification in aeration basin and denitrification inside a methane tank.
Nitrification improvement mechanism:
Nitrification is biological oxidation of ammonia via nitrite to nitrate: NH3⇒NO2⇒NO3
The process occurs in two steps. Both include activity of different bacteria that are extremely sensitive to pH level. Below you can see a graph illustrating dependence of maximum nitrification rate on pH of the system.
Percent of maximum rate of nitrification at constant temperature (20 C°) versus pH
Source: EPA-625/4-73-004a, Revised Nitrification and Denitrification Facilities Wastewater Treatment, U.S. Environmental Protection Agency Technology Transfer Seminar.
MagTreat® buffers at a pH of approx. 9, which is in most cases the optimal level for bacteria reproduction. Thanks to the unique properties it is impossible to overshoot the pH, whereas NaOH can easily reach a pH of 13 and Ca(OH)2 a pH 12. At these pH levels the biomass will sustain severe damage.
Further you can see an illustrated cost-reduction efficiency of MagTreat in comparison with other alkalis:
1 IBC of MagTreat® 3 IBC of Ca(OH)2
60% suspension 30% suspension
1 IBC of MagTreat® 1.6 IBC of Na(OH)
60% suspension 50% solution
Solutions for this field
The most demanded products of RMCC in this field are:
Contact us, our experts will provide you with advice on the use of the productMagTreat®
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Ecopiren — effective mineral flame retardant and smoke absorber for polymer composites based on magnesium hydroxide crushed
AktiMax — new environmentally friendly magnesium fertilizer for all crops as basic fertilizer and meliorant
AgroMag — conditioning additive (anti-caking agent) for use in the manufacture of ammonium nitrate and NPK
MagTreat — solution for water treatment and flue gas desulphurization
FluMag — highly efficient metallurgical magnesia based flux brucite Kuldur deposit
MagPro — used as a reagent for the vulcanization of rubber in the manufacture of rubber products
BleachMag — highly efficient new generation product for the production of cellulose and semi-high output
MagAdd — ideal raw material for the production of a wide range of magnesium compounds and products based on the best varieties of brucite
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- Metallurgical flux