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Odor control and sludge dewatering

Odor control and sludge dewatering

Odor is a wide spread problem in waste water treatment facilities. It can affect an environment, operational personel and also can severely damage the eqipment. Thereby, the question of Odor Control araises sharply these days. MagTreat® can reduce odor formation not only on initial stages of water treatment process but at the same time on the final stage during biosolids processing. MagTreat reduces the costs of utilizing solid wastes via improvement of sludge dewatering.

Odor control

A common problem of sewage systems is“rotten eggs” smell, caused by presence of gaseous H2S.In acidic media at a low pH sulfur is being converted to sulfate ions SO42-and then into hydrogen sulfide. TheThiobacillusbacteriaconsumesoxygenfrom airandH2S gas and forms highly corrosive sulfuric acidH2SO4

Thereby the presence of odor in the sewage system indicates that steel and concret consructions could be demaged.Passing into the WWT system at the pretreatment stage MagTreat® raises pH level up to 9. At such levels almost no gaseous H2S is forming. So MagTreat not onlyreduces odors, but alsohelps to preventcorrosion of the equipment vianeutralization of sulfuric acid.


Liquid/gas phase diagramm in HS-/H2S system. At low pH lever of 5 the concentration of gaseous

H2S is 50 times higherthan at higher pH of aprox. 9, when there almost no gaseous H2S is forming.

Improvement of flocculation and biosolids processing

Flocculation process can be affected by a content of monovalent cations, which are incerted into WWT system with household detergents or sodium based water softeners, or from neutralizing agent based on caustic soda.Thanks to the bivalent Mg2+ cations MagTreat enhances the joining of long polymer molecules (for example, FOG + bacteria) which make them easier to flocculate and separate from water. When added into the sewages. MagTreatimproves not only primary treatment process but also dewatering during biosolids processing. It is also useful for limiting of the odors (mainly H2S) emissions during transportation and storage of biosolids.

Hydrogen sulfide is the main component of odors emissions and causes a rotten eggs smell. MagTreat raises pH level in the pressed solid mass to approx. 9. At such level almost no gaseous H2S is formed.Magnesium hydroxide particles dissolve slowly – they stay active during a long period of time, working like a buffer whilst maintaining an adequate pH level in the system.


Solutions for this field

The most demanded products of RMCC in this field are:


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