New technology for processing pig's manure with follow-up production of organic fertilizer

A contamination of ground waters and related ecological problems represent key factors preventing effective use of large amounts of pig´s manure directly as a fertilizer. In the presented project a technology for processing up to 100 000 m3 of manure to 4 000 tons of high-quality humus fertilizer on yearly basis is introduced. A follow-up sale of the fertilizer allows return of the investment and covers operational costs of the technology.

In the technological process a low-quality manure diluted with technological water {1,5-3 % of dry matter} is chemically treated with coagulant, which results in precipitation of solid matters and colloid particles. In a separation system the solids are separated from aqueous part, which is then led to a small-scale biological water treatment station, purified and released as clean water into recipient.

The solid part undergoes a process of further de-watering with a help of flocculants straw, sawdust and woodchips. Such substrate is loaded into one of the 80 m³ fertilizers in volumes of each of the composting facility boxes.

At its introduction, the technology obtained the ''Zlatý Kosák'' the major price of an international exhibition Agrokomplex 2000 (Nitra, Slovak Republic).

Composition of humus fertilizer HUMAVIT:

• Moisture: max. 55%
• Combustible matter in dry matter: min. 70%
• Total nitrogen (N) in dry matter: 2-3%
• Total phosphorus (P) in dry matter: min. 1,5%
• Total potassium (K) in dry matter: min. 0,7%
• Total calcium (Ca) in dry matter: min 1,5%
• Total magnesium (Mg) in dry matter: min. 0,2%
• pH/H₂0: 6,5 - 8,5
• Ratio of C:N: max. 20
• Ratio of humic acids to fulvic acids: > 1

Properties of HUMAVIT Fertilizer

Accredited by authorized institution UKSUP as ecological fertilizer:

• Compliance with hygienic standards
• Constant composition and highly fertilizing and cultivating character
• Rich source a nutrients NPK
• Source of trace elements
• Release of nutrients according to the plants needs
• Reduced loss of nutrients by elutriation and evaporation
• Unused nutrients remain in the soil and are available in the next growing period
• Enables savings of mineral fertilizers, with reduction of soil salinity
• Markedly improves structure of soil, respiration and biological processes, which increases growth of biomass in soil
• Reduces soil acidity

Liquid manure chemical treatment and humus production. Characterization of problems for pig manure treatment:

• very low concentration of dry matter in manure (1,5 - 6%)
• need of precipitation not only suspended particles but colloids also, because colloids are the carrier of organic matter
• thickening and separation of sludge from liquid phase
• mixture of sludge with cut straw for reaching a dry matter concentration necessary for composing
• technology was designed and realized for the processing of 100 000 m³ liquid manure from two farms with 20 000 pcs of pigs