A kind of breeding sewage purification treatment method

Abstract

The invention provides a breeding wastewater purifying method. The method comprises the following steps: 1) fermenting pig manure discharged from pigpens in a biogas digester for 15 days to one month, and standing still for layering to obtain biogas residues at the bottom and biogas residue water at the top; and carrying out static settlement on breeding wastewater to obtain biogas residues at the bottom and drying the biogas residues; and 2) discharging the biogas residue water into a pond, a lake or a reservoir, planting rice and / or vegetables on the surface of water and breeding fish in water. According to the method, based on a floating plate planting technique, hydrophilous plants are transplanted into lakes and ponds from farm land and therefore dual effects of increasing income and preventing water pollution can be achieved. By planting vegetables on the surface of water, the ammonia nitrogen content can be reduced by 60%-85%, the total nitrogen content is reduced by 40%-75%, the total phosphorus content is reduced by 30%-60%, the sodium content is reduced by 8%-12% and the potassium content is reduced by 30-40%; the occurrence rate of plant diseases and insect pests of vegetables planted on the surface of water is much lower than the occurrence rate of vegetables planted in farm land; the vegetables planted on the surface of water are completely prevented from use of chemical fertilizers and pesticides.

Description

Technical field

[0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a purification method of aquaculture sewage. Background technique

[0002] my country’s national meat production reached 72.787 million tons in 2008. However, while large-scale breeding meets the needs of urban and rural people, the current management model has also caused the disadvantage of excessive livestock and poultry manure and excessive flushing water. The resulting increasingly serious environmental pollution problems not only affect economic development, but also endanger ecological security. The chemical oxygen demand (COD) of livestock manure produced by agricultural production far exceeds the sum of COD emissions of industrial wastewater and domestic sewage in my country. Poultry breeding pollution has become the third largest pollution source after industrial pollution and domestic pollution, and it has become one of the main causes of non-point ...

Examples

Embodiment 1

[0033] See the process figure 1 .

[0034] 1) The pig manure discharged from the pig pen is concentrated in the sewage collection tank, and then enters the biogas tank for biogas fermentation; after 4-8 months of fermentation, the biogas produced is used as domestic gas or power generation fuel; the material in the biogas tank is separated after standing The layer is divided into the bottom biogas residue and the upper biogas residue water, and the obtained lower biogas residue is dried; after the biogas residue is dried, it is mixed with soil (mixing ratio 1:4) to make the growth substrate for bonsai vegetables.

[0035] 2) The biogas residue water is discharged to the pond, with about 100 tons / mu per year, rice and vegetables are planted on the water surface of the reservoir, and fish are cultivated under the water surface;

[0036] The vegetable is rapeseed; the fish is mainly grass carp, 70%, and the rest is carp, and 1,000 fry are placed per acre of water. No feeding is require...

Embodiment 2

[0041] 1) The pig manure discharged from the pig pen is concentrated in the sewage collection tank, and then enters the biogas tank for biogas fermentation; after 4-8 months of fermentation, the biogas produced is used as domestic gas or power generation fuel; the material in the biogas tank is separated after standing The layer is divided into the bottom biogas residue and the upper biogas residue water, and the obtained lower biogas residue is dried; after the biogas residue is dried, it is mixed with soil (mixing ratio 1:4) to make the growth substrate for bonsai vegetables.

[0042] The bonsai vegetable is selected from one or more of tomatoes, colorful peppers, strawberries, celery, and zucchini.

[0043] 2) The supernatant liquid obtained from the farming sewage standing and sedimentation is discharged to the pond, and the sewage discharged from the pig pen where 20-30 pigs is raised is discharged into the water area of ​​1 mu. Vegetables are planted on the water surface of th...

Technical field

[0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a purification method of aquaculture sewage. Background technique

[0002] my country’s national meat production reached 72.787 million tons in 2008. However, while large-scale breeding meets the needs of urban and rural people, the current management model has also caused the disadvantage of excessive livestock and poultry manure and excessive flushing water. The resulting increasingly serious environmental pollution problems not only affect economic development, but also endanger ecological security. The chemical oxygen demand (COD) of livestock manure produced by agricultural production far exceeds the sum of COD emissions of industrial wastewater and domestic sewage in my country. Poultry breeding pollution has become the third largest pollution source after industrial pollution and domestic pollution, and it has become one of the main causes of non-point ...

Examples

Embodiment 1

[0033] See the process figure 1 .

[0034] 1) The pig manure discharged from the pig pen is concentrated in the sewage collection tank, and then enters the biogas tank for biogas fermentation; after 4-8 months of fermentation, the biogas produced is used as domestic gas or power generation fuel; the material in the biogas tank is separated after standing The layer is divided into the bottom biogas residue and the upper biogas residue water, and the obtained lower biogas residue is dried; after the biogas residue is dried, it is mixed with soil (mixing ratio 1:4) to make the growth substrate for bonsai vegetables.

[0035] 2) The biogas residue water is discharged to the pond, with about 100 tons / mu per year, rice and vegetables are planted on the water surface of the reservoir, and fish are cultivated under the water surface;

[0036] The vegetable is rapeseed; the fish is mainly grass carp, 70%, and the rest is carp, and 1,000 fry are placed per acre of water. No feeding is require...

Embodiment 2

[0041] 1) The pig manure discharged from the pig pen is concentrated in the sewage collection tank, and then enters the biogas tank for biogas fermentation; after 4-8 months of fermentation, the biogas produced is used as domestic gas or power generation fuel; the material in the biogas tank is separated after standing The layer is divided into the bottom biogas residue and the upper biogas residue water, and the obtained lower biogas residue is dried; after the biogas residue is dried, it is mixed with soil (mixing ratio 1:4) to make the growth substrate for bonsai vegetables.

[0042] The bonsai vegetable is selected from one or more of tomatoes, colorful peppers, strawberries, celery, and zucchini.

[0043] 2) The supernatant liquid obtained from the farming sewage standing and sedimentation is discharged to the pond, and the sewage discharged from the pig pen where 20-30 pigs is raised is discharged into the water area of ​​1 mu. Vegetables are planted on the water surface of th...

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