Recycling treatment method of water-submerged manure in breeding industry

Abstract

The invention discloses a recycling treatment method of water-submerged manure in a breeding industry. The recycling treatment method comprises the following steps of: carrying out treatment of solid-liquid separation, filtering, aerated stripping and fermentation on biogas slurry from biogas preparation in sequence to obtain organic fertilizer in a liquid state, and carrying out pressed filtering and fermentation on sludge from biogas preparation to obtain organic fertilizer. The recycling treatment method disclosed by the invention can be used for treating the water-submerged manure containing manure and washing water in the breeding industry, the sludge and the biogas slurry from biogas preparation are converted into the organic fertilizer and the liquid-state organic fertilizer with commercial values, so that zero discharge of waste water in a farm is realized, the energy-saving and environmentally-friendly effects are achieved; the waste also can provide high-quality fertilizer resources for agriculture, and thus the bottleneck of environmental protection in a large-scale pig farm is solved in the real sense; and in addition, the recycling treatment method is low in operation cost, has wider use prospect and can be widely used in the field of waste treatment in the breeding industry.

Description

technical field [0001] The invention is used in the field of aquaculture waste management, and in particular relates to a treatment method for aquaculture waste. Background technique [0002] The effective management of livestock waste has become one of the three major problems that plague environmental workers around the world. As far as its emission is concerned, the emission of organic matter in terms of COD is twice that of industrial and urban domestic waste. To make matters worse, industrial and urban domestic wastes have been effectively treated, while the treatment of breeding wastes in our country is still in the state of no treatment or simple treatment. [0003] The reason why aquaculture sewage is difficult to treat is mainly due to the high concentration of organic matter (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP), which are tens or even hundreds of times higher than most industrial sewage and domestic sewage. And processing costs can be imagin...

AI Technical Summary

Problems solved by technology

Although biogas can bring considerable economic benefits, the biogas slurry requires sufficient absorption capacity of the surrounding land. If the surrounding land does not have enough area to carry the biogas slurry, then the biogas slurry will form a secondary pollution source

Considering the domestic agricultural structure, small scale and uneven distribution, biogas slurry fertilizer has low concentration, large quantity and high transportation cost

At present, domestic biogas slurry fertilizer cannot be commercialized, and most biogas slurry farmers have discharged it into rivers, polluting surface water and groundwater

[0008] 2. Therefore, the current domestic aquaculture industry's water-soaked manure process energy ecological biogas project, the follow-up process needs to add other sewage treatment projects

According to the current sewage treatment cost of the aquaculture industry is 1.7 yuan / ton-2.5 yuan / ton, it is difficult to meet the standard for ammonia nitrogen treatment

[0009] 3. If a deep purification process is adopted, such as membrane biochemical technology or reverse osmosis technology, the ammonia nitrogen can be treated up to the standard, but its operating cost will be greatly increased (about 10 yuan / ton). Generally, breeding enterprises will not adopt such a high operating cost process

Images