EssDe® - Process
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In the EssDe® process, the majority of the carbon is fixed by adsorption in a first high-loaded step (A-step) and used for methanogenic digestion. In order to separate the colloidal COD efficiently, flocculants are added. This can be combined with phosphorous removal (pre-precipitation). COD-removal is maximized and the endogenous respiration is minimized. 60 - 90% of the organic substances can be used for methanogenic digestion. In this way most of the COD can be converted directly into biogas and subsequently into electrical energy. |
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| The COD removed in the high-loaded step is anaerobically easy biodegradable. Unlike conventional systems in which aerobic biomass is first formed and than limiting in the step of hydrolysis, here the substrate can be easily converted to biogas. As it is known, the digestion of primary sludge is much easier than that of activated sludge. | |
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It is not only the saving of aeration-energy by avoiding the endogenous respiration, it is simultaneously the production of much more methane and thus energy. The sludge characteristics are different and the dewatering of the digested sludge is much better. |
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The concept is known for many years as the A/B-process and has often been implemented industrially. The major disadvantage of the system was, that in low-loaded B-stage there is not sufficient carbon for denitrification left. With the DEMON®® system, there is now a tool available, which removes nitrogen in a very efficient way. |
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A significant part of the nitrogen is concentrated in the high loaded sludge from the A-step. This nitrogen becomes visible when the sludge is dewatered. DEMON® in side stream eliminates more than 50% of the nitrogen very efficiently. DEMON® in the main stream then provides an effective removal of the residual nitrogen. For this purpose the B-step is enriched with sludge from DEMON®-side stream treatment. |
cyklar-stulz GmbH | Rietwiesstrasse 39 | CH-8737 Gommiswald | SWITZERLAND | Phone +41 55 290 11 41 | info@cyklar.ch