Regulating method for fish culture using biogas slurry

Abstract

The invention relates to a regulation method for utilizing biogas slurry for fish culture. The method includes step 1) a fish pond is prefabricated, a biogas slurry inlet pipe is arranged on one sideof the upper portion of the fish pond, a drain pipe for controlling the water level is disposed on the lower portion of the fish pond, and two multi-functional shallow aerobic aeration devices are mounted in the fish tank; step 2) in selected fishes, filter feeding type chub and bighead carp in the upper layer of the water are primary, combined with herbivorous grass carp in water the middle layerand carp and crucian in the water lower layer; step 3) the biogas slurry is led into the fish pond through the biogas slurry inlet pipe, and the biogas slurry is generated by anaerobic fermentation of fecal sewage generated by the livestock and poultry industry; step 4) the biogas slurry inlet pipe continuously injects the biogas slurry into the fish pond for 24 h every day, the daily inflow andoutflow amount of the biogas slurry in the fish pond is controlled, and the biogas slurry inlet amount is 1.5-2% of the effective water amount. Through the combined effects of physics, biochemistry and biology, the dissolved oxygen content in the water body is increased, and nutritive substances in the biogas slurry are quickly utilized in a variety of ways to be converted into bait capable of being used by fish.

Description

technical field [0001] The invention relates to a method for regulating and controlling fish by using biogas slurry. Background technique [0002] Biogas slurry is the waste water produced by anaerobic fermentation of feces and sewage from livestock and poultry breeding. Anaerobic fermentation can kill pathogenic bacteria and diseased insect eggs in feces, and the removal rate is as high as 98%. Livestock and poultry manure sewage is rich in feed nutrients that have not been digested and absorbed by livestock and poultry. After anaerobic fermentation, it is not only rich in bacterial protein, but also contains a variety of peptide proteins, amino acids, vitamins, undecomposed organic matter, trace elements and unknown Growth factors and other animal nutrients, these nutrients help to improve the immune function and disease resistance of fish, therefore, biogas slurry is nutrient-rich wastewater that can be safely used as fish bait; and biogas slurry also contains a large amo...

AI Technical Summary

Problems solved by technology

However, with the intensive and large-scale development of the livestock and poultry breeding industry, a large amount of aquaculture wastewater has been discharged in a concentrated manner, and the biogas slurry produced by its anaerobic fermentation is generally difficult to match with enough arable land for utilization and consumption in most parts of the south.

Due to the large amount of biogas slurry produced, the return to the field is limited for consumption. If the biogas slurry is not used effectively, it must be purified, otherwise direct discharge will cause environmental pollution.

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