Liquid manure
dewatering

Liquid manure is valuable. It contains elements that are essential for plant growth. However, large quantities of these can become a problem. Above all, high phosphate and nitrogen content makes storage and processing difficult. How can this disposal problem be solved and the nutrient cycle closed? The answer lies in separation.

Breeding farms produce considerable quantities of liquid manure. Even storage is critical, because untreated liquid manure tends to be aggressive to toxic. In order to avoid accident hazards such as suffocation or drowning, operators must comply with numerous safety regulations. In addition, there is the high odor and particulate pollution.

In certain regions and seasons, restrictions apply to the spreading of liquid manure. Farmers must either create significantly larger storage capacities or transport their liquid manure to other regions. This "manure tourism" is associated with further costs and additional emissions.

Conventional separation processes for liquid manure, for example with press screws, usually do not bind enough of the nutrients in the dry solids. Consequently, the concentration in the remaining liquid manure is still too high. The MoRoPlant separation system, in contrast, offers a solution that is both efficient and energy-saving. Thanks to a novel conditioning agent and Flottweg's proven centrifugal technology, the system achieves particularly high separation efficiencies for phosphate and nitrogen.

In contrast to stationary liquid manure processing plants, the mobile system MoRoPlant is more flexible, energy-saving and cost-effective. As a container system and it can be used at other locations. This makes it ideal for smaller farms, machinery cooperatives and agricultural equipment suppliers. It will also make it possible to process manure lakes, which already represent a major environmental problem in some regions of the world.

The solids extracted by separation are odorless. Safe and simple storage; a safety data sheet is not necessary. The unique added value comes from the fact that the solids can be pelletized and resold, for example as garden fertilizer or spreadable fertilizer for horticultural businesses and garden markets.

The centrate obtained is less aggressive or toxic than the original liquid manure. The reduced risk lowers the permit requirements necessary for storage. Odor pollution, particulate emissions and operating costs are also reduced. The water is ideal for irrigating hops and asparagus by sprinkling. It is also suitable for irrigating leguminous crops (five-field farming), thus contributing to sustainable soil improvement.

The measurements took place on a pig farm in Bavaria. On several measuring days, tests were carried out with liquid manure from various pig and dairy herds from a total of six farms. The separation efficiency for dry solids was more than 80 percent.