There are generally 3 types of digester plant types: Farm based, Industrial based and Municipality WWTP based. Mechanical mixing generates the best process results with the lowest power consumption. Far better then using pumps or compressors!
Depending on technology provider a digester plant can consist of following mixed process steps:
- reception storage tank
- mix tank
- primary digester
- secondary digester
- digestate storage tank
The newest energy markets require Mixing Technology at the lowest power consumption
Reception storage tank
Pumpable feedstock is received in tanks of 50 – 200 m3. Mostly products like separated and macerated organic food waste. The assumed viscosity of the mixture runs from 50-1000 cP. The purpose of the mixer is to keep it homogeneous or to mix several products . For this Jongia’s type L with hydrofoil elements is an excellent choice. With its high efficiency and axial generated flow the process result will be reached with low power need and steady operation. The mixer type L is designed with a bottom steady bearing or a heavy duty bearing arrangement to absorb the powers created during the mixing process.
Several different feedstock need to be mixed into a homogeneous feedstock to the digester. This mix is important to be homogeneous for a steady and controlled feed to the digester. Examples are food waste, macerated agricultural waste, manure and others. Let’s take cream as an example. The heavy duty top entry mixer type LB is fit for this step of the process.
Primary and secondary digester
In the digester there must be a homogeneous content off organics, pH, temperature and bacteria with no stagnant zones. Drymatter content in the digester of up to 15% is no problem. For industrial and municipality type of biogas plants with high tanks from 1.000 to 10.000 m3 the special slow running top entry mixer type LBW with large hydrofoil propellers is the best solution. This design prevents a floating layer and generates an excellent top over bottom bulk flow through the hole tank. Due to this Jongia mixers enhances excellent biogas production efficiency and extraction.
To prevent clogging of the mixer and trouble free operation, temporary running anti clockwise will prevent this. Especially when feeding long fibrous material like grass, straw or plastic from organic food waste.
For farm based biogas plants with low concrete tanks from 1.000 to 5.000 m3 Jongia provides type JRWM side entry agitators which have large hydrofoil propellers for big thrust and low power. Combined with vertical paddle mixers to prevent floating layer this solution generates optimal process results.
Energy – Contacts
Jan Siert Tjeerdsma
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Digestate storage tank
Our type JRWM side entry agitators which have large hydrofoil propellers for big thrust and low power are best suitable and are providing a good homogeneous fertilizing end product.
HoSt, Omrin, Waterleau, Shanks, Orgaworld, Hydrothane, Adverio, Aben Recycling, van de Groep, Croda, GMB, Waterschap Roer en Overmaas.