Method for preparing commercial organic fertilizer from yam vinasse

Abstract

The invention discloses a method for preparing a commercial organic fertilizer from yam vinasse, which comprises the following steps of: preparing alcohol or white spirit from a dried and ground yam raw material; pumping vinasse slag liquid into a biogas fermentation pool and fermenting to generate biogas, biogas residue and biogas fluid; pumping the biogas residue and the biogas fluid into a sedimentation tank to ensure that the biogas residue with the specific gravity higher than that of water is settled at the bottom of the sedimentation tank; collecting lower deposition, putting the lower deposition into a sludge concentration tank and making supernatant automatically flow into a floatation tank to carry out air flotation treatment; putting upper organisms subjected to air floatation treatment into the sludge concentration tank; pumping the biogas residue in the sludge concentration tank into a plate-and-frame filter press to carry out filter pressing; mixing dried biogas residue and wet biogas residue in a ratio of 2:1-3 to regulate the moisture content of the biogas residue to be less than or equal to 40 percent; and drying the product by using a pipe bundle drier to obtain the finished product of the organic fertilizer. The method of the invention has the advantages of simpleness, small occupied area of equipment and places, high rotation efficiency, no need of additional granulation, low production cost, short production period and high fertilizer efficiency; and the product can reach fertilizer application standards of a non-polluted, green and organic planting base.

Description

technical field [0001] The invention relates to a method for producing commercial organic fertilizer by using potato distiller's grains. Background technique [0002] The use of distiller's grains to produce commercial organic fertilizers is conducive to improving the environment, improving the benefits of brewing enterprises and developing ecological agriculture. Distiller's grains need to undergo biogas anaerobic fermentation to produce biogas residues, and then produce commercial organic fertilizers. At present, there are still the following problems in the production of commercial organic fertilizers by using alcohol waste liquid biogas residues: (1) The separation of biogas residues and biogas liquids is difficult. Due to the high water content of the biogas residue liquid, the direct drying effect is poor, and an advanced residue liquid separation device is required; while the biogas residue liquid produced by rural biogas projects and biogas projects produced by live...

AI Technical Summary

Problems solved by technology

At present, there are still the following problems in the production of commercial organic fertilizers by using alcohol waste liquid biogas residues: (1) The separation of biogas residues and biogas liquids is difficult

Due to the high water content of the biogas residue liquid, the direct drying effect is poor, and an advanced residue liquid separation device is required; while the biogas residue liquid produced by rural biogas projects and biogas projects produced by livestock and poultry farms has complex components and the size of the residue Different, it is difficult to separate biogas residue and biogas slurry by machinery, which will cause great damage to the machine

(2) Granulation and drying are difficult and costly

In order to facilitate granulation and drying in production, materials with low water content such as crop straw are generally added, and the ratio is adjusted to reduce the water content of the mixture to about 30%; this reduces the content of biogas residue. In addition, the carbon-nitrogen ratio in crop straw (C / N) is too high, which is not conducive to the utilization of nitrogen by crops and reduces fertilizer efficiency

Moreover, most of the existing drying heat sources are steam generated by coal heating boilers, and the cost is relatively high

(3) Long production cycle and large floor area

This method has the disadvantage of long curing time, which needs to be cured for 5-6 months. Even if a special turning and polishing machine is added to regularly turn and throw the materials in the curing pool, the curing time also needs 2-3 months

Images