VWG Engineering has developed a tropical lagoon digester for the treatment of wastewater with high organic content and organic solids. These systems are designed and constructed with expert engineering knowledge and are highly efficient.
Our expertise has helped us to create a tropicalized covered lagoon system which is very efficient, economical and can be constructed by local companies.
Our digester are CSTR systems with mechanical agitation and or Circulation pump to improve biogas production and avoid the formation of scum and foam. Through the agitation will be also improved the biogas production and a better degradation of COD.
We install in all our digester a pumping system to extract the sludge which sediment at the bottom of the lagoon.
On this way, we do prevent that after a few years of operation the digester will be filled with sludge.
Blankets of scum may form during a startup or after a few years of operation. During startup a thin zone of high volatile acid content may become localized at the digester surface. Under a mature system a thick, black layer of grease, vegetable matter, and concentrated sludge may cover the entire surface.
Under a mature system the breakdown of scum at the surface of the digester may cause foaming. When scum degrades, a pocket of high volatile acid content develops. The acids produce a condition that is similar to startup. Stratification of non-digested solids near the surface causes foaming.
If foam and scum production in an anaerobic digester is a severe and frequent problem that we have solve in our covered lagoon digester through the instalation of agitators.