JPH10118663A - Treatment of stockbreeding waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily purify stockbreeding waste water discharged from a swinery, a milking cow breeding field or a poultry house with excellent efficiency. SOLUTION: 100-300ppm of a flocculant is added to and mixed with stockbreeding waste water and pineapple enzyme extracted from pineapple juice is subsequently added to and mixed with the waste water in an amt. of 50-500ppm to sediment flocs and purified supernatant water is obtained. It is also pref. to add 100-1000ppm of hypochlorite or a salt thereof to the purified supernatant water to prepare sterilized water. It is pref. to perform treatment after deluting water is added to stockbreeding water (raw water) in an amt. of 2-5 times and it is pref. that purified supernatant water obtained as diluting water is recycled to be used and it is pref. to form a closed system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating livestock wastewater, and more particularly to a method for treating livestock wastewater discharged from a pig farm, a dairy cattle breeding farm, a poultry house, and the like with excellent efficiency. Regarding the processing method.

[0002]

BACKGROUND OF THE INVENTION Livestock effluents have strong off-flavors, pollution and coloration, and have high BOD values, making it difficult to obtain sufficiently purified water by conventional methods. there were. Conventional simple processing includes:
(1) A method of separating the effluent from the barn into solids and liquid wastewater by sieving, introducing the wastewater into a septic tank, adding diluting water to the desorbed liquid from the septic tank, and discharging the wastewater. (2) Wastewater from slaughterhouses is separated into solid matter and liquid wastewater by sieving, and the method of infiltrating the wastewater into the underground is carried out. In addition, activated sludge treatment is adopted as a high-grade treatment to reduce the high-load BOD value. ing. However, with the conventional simple method, the wastewater treatment is insufficient, so that it is not possible to obtain purified water that can be discharged without causing environmental pollution.In addition, the high-grade activated sludge method requires large-scale purification treatment equipment, and requires a large installation area. It requires a lot of time, takes a long time to process, and requires high equipment costs and operating costs.

[0003]

Means for Solving the Problems In order to solve the above problems, the present inventor has developed a method for purifying livestock wastewater with high efficiency as a result of intensive studies, and has provided the present invention. That is, the present invention is a method for treating livestock wastewater described below. (1) 100 to 300 ppm of a flocculant is added to and mixed with livestock wastewater, and 50 to 5.00 ppm of pineapple enzyme extracted from pineapple juice is added and mixed to precipitate floc and purify the purified supernatant water. A method for treating livestock wastewater, comprising: (2) After adding and mixing 100 to 300 ppm of a flocculant to livestock wastewater, adding 50 to 5.00 ppm of pineapple enzyme extracted from pineapple juice and mixing to obtain purified supernatant water, A method for treating livestock wastewater, comprising adding 100 to 1,000 ppm of hypochlorous acid or a salt thereof to purified supernatant water. (3) A mixture of pineapple enzyme and one or more of slaked lime fine powder, tourmaline fine powder, zeolite fine powder, or shell fossil fine powder in an amount of 2 to 20 times the amount added to livestock wastewater. The method for treating livestock wastewater according to claim 1 or 2, wherein: (4) The livestock wastewater according to any one of the above items (1) to (3), wherein 2 to 5 times the amount of dilution water is added to the livestock wastewater raw water. Processing method. (5) The method for treating livestock wastewater as described in (4), wherein the purified supernatant water obtained in the above item (1) or (2) is recycled as dilution water. (6) The closed systemization treatment is performed by recycling the purified supernatant water obtained in any of the above items (1) to (3) as dilution water. (5) The method for treating livestock wastewater according to the item (5).

[0004]

Next, an embodiment of the present invention will be described. The livestock wastewater to be treated includes wastewater discharged from pig farms, dairy cattle nurseries, poultry houses, and the like. In the livestock wastewater, as in the conventional method, first, the wastewater from the livestock barn is separated into solid matter and liquid wastewater by sieving, and the wastewater is treated as a liquid to be treated (treated wastewater). In the present invention, the livestock wastewater (the wastewater to be treated) is preferably diluted by adding 2 to 5 times the amount of dilution water, and then a coagulant such as polyaluminum chloride (PAC) or slaked lime is added. ~ 3
Add 00ppm and mix. Next, 50 to 5.00 ppm of pineapple enzyme extracted from pineapple juice is added to the added mixed solution, mixed, and left for a while to precipitate floc. In this case, floc generation is rapid and the size of each floc is large, which is extremely good. The pineapple enzyme is a sludge waste treatment agent (JP-B-6-9615) previously developed by the present inventors.
No. 7 publication). That is,
First, pineapple juice squeezed from pineapple fruit is dehydrated and concentrated at room temperature, and then lyophilized to obtain pineapple enzyme powder having various activities for decomposing sugars, proteins, fats, and the like. In use, a mixture of the powder and 2 to 20 times the amount of slaked lime fine powder, tourmaline fine powder, zeolite fine powder, shell fossil fine powder, activated carbon powder, and the like, and then forming into a granule may be used. Is also preferred.

Further, in order to ensure sterilization of purified supernatant water (treated wastewater) obtained by performing the above-mentioned treatments on livestock wastewater, hypochlorous acid or a salt thereof, for example salad powder, is added in an amount of 100 to 100%. It is preferable to add and mix 1,000 ppm. In addition, hypochlorous acid or a salt thereof is for generating and supplying nascent oxygen, so long as it generates nascent oxygen, other substances may be used. Good.

[0006]

【Example】

[Example 1] Manure of yellowish brown and strong odor excreted from pigs in a pig raising facility (BOD: 29,000 to 38,000)
0 ppm, suspended matter: 85,000 to 140,000 p
pm, evaporation residue: 110,000-170,000p
pm, loss on ignition: 90,000 to 130,000 pp
m, total nitrogen of 3,000 to 5,000 ppm) was passed through a 50-mesh vibrating sieve to perform solid-liquid separation, and the obtained filtrate was diluted by adding 3 times the amount of water. To the diluted solution, 200 ppm of the polyaluminum chloride (PAC) flocculant was added and mixed, and then 100 ppm of the pineapple enzyme was added and mixed, and the mixture was allowed to stand for a while. As a result, large flocs precipitated in large quantities. The obtained supernatant water has almost no odor and is in a colorless state, and the water quality is BOD: 1.0 to 1.5 ppm,
Suspended substances: 0.8 to 1.2 ppm, total nitrogen 0.4 to 0.
The purified water had 6 ppm, chromaticity of 1 degree, and turbidity of 0.5 degree. In addition, the content of suspended solids and evaporation residues was very low, which sufficiently achieved the effluent standard for sewage discharge. Further, the supernatant water can be sufficiently recycled as the dilution water, and the treatment of the present invention can be made into a closed system.

[Embodiment 2] The supernatant water obtained by the treatment in Embodiment 1 was mixed with salad powder for sterilization by 100 to 1.0%.
After adding and mixing 00 ppm, the mixture was left for 3 hours. As a result, the water quality obtained in Example 1 was retained, and general bacteria:
0 / mg, coliform group: The undetected number of treated water was obtained.
This achieved sufficient sewage drainage standards and could be used as washing water, or as bath water or body wash water.

Comparative Example A yellow-brown, strong odor excreta excreted from a pig in a pig raising facility, which was the same as that used in Example 1, was subjected to a 50-mesh vibrating sieve and subjected to solid-liquid separation.
The resulting filtrate was diluted by adding 3 times the amount of water. After adding and mixing 200 ppm of a polyaluminum chloride (PAC) coagulant to the diluted solution, the mixture was left for a while. As a result, flocs precipitated, but the particles were not so large and the amount of sediment was not large. The resulting supernatant is almost colorless but still has a strong odor and the water quality is
The residual values of the BOD suspended solids and the total nitrogen were considerably high, and the suspended solids and the evaporation residues were also high in content, and could not meet the effluent standard for discharge of sewage.

[0009]

According to the method for treating livestock wastewater of the present invention,
Removal of odor and coloring from livestock wastewater, which has been difficult so far, can be easily performed, and there is no need to provide a special device. Also, according to the method of the present invention in which hypochlorous acid or a salt thereof is added, treated water free of residual bacteria can be obtained. Further, by using the treated water obtained by the method of the present invention as the dilution water in the method of the present invention with respect to the raw livestock wastewater, the livestock wastewater can be produced at low cost without having to purchase clean dilution water from other places. Can be performed.
By recycling the purified supernatant water obtained by the method of the present invention as the dilution water, wastewater treatment as a closed system becomes possible.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/50 540 C02F 1/50 540B 550 550B 560 560Z 1/76 ZAB 1/76 ZABA

Claims (6)

[Claims] 1. A coagulant is added to livestock wastewater at 100 to 300 pp.
A method for treating livestock wastewater, comprising adding and mixing 50 to 5.00 ppm of pineapple enzyme extracted from pineapple juice and mixing to precipitate floc and obtain purified supernatant water. 2. A livestock wastewater containing a coagulant of 100 to 300 pp.
After adding and mixing, purified supernatant water was obtained by adding and mixing 50 to 5.00 ppm of pineapple enzyme extracted from pineapple juice, and then the purified supernatant water was further hypochlorous acid or the same. 100-1,000p salt
A method for treating livestock wastewater, comprising adding pm. 3. A mixture of pineapple enzyme and one or more of slaked lime fine powder, tourmaline fine powder, zeolite fine powder or shell fossil fine powder in an amount of 2 to 20 times the amount added to livestock wastewater. 3. The method according to claim 1, wherein
The livestock wastewater treatment method described in the above. 4. A method for treating livestock wastewater, wherein the livestock wastewater according to any one of claims 1 to 3 is obtained by adding 2 to 5 times the amount of dilution water to the livestock wastewater raw water. . 5. The method for treating livestock wastewater according to claim 4, wherein the purified supernatant water obtained in claim 1 or 2 is recycled as dilution water. 6. The closed system processing according to claim 4, wherein the purified supernatant water obtained in any one of claims 1 to 3 is recycled and used as dilution water. Livestock wastewater treatment method.