JPH11262785A - Plant cultivating apparatus having waste water purifying function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorption-decompose high load waste water such as livestock excretion with roots of plants and biological membranes formed on the surfaces of roots or the surface of a membrane module to purify the same supplying air to the high load waste water through the membrane module to caltivate plants. SOLUTION: Plants 3 are fixedly set within an upwardly opened water- resistant container and high load waste water containing fertilizer components is supplied into the container and a membrane module 6 having gaps not allowing water to pass but air to pass is disposed under the plants 3. Compressed air is supplied from the surface side of the membrane module 6 by a compressor 7 not only to supply oxygen to roots of the plants 3 but also to absorption-decompose fertilizer components by biological membranes 9 formed on the surface of the membrane module 6 and the surfaces of roots 3a of the plants 3 to purify the high load waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for absorbing and decomposing high-load wastewater such as livestock excrement by a biofilm by roots of a plant while cultivating the plant in a container by a membrane module and pressurized air. The present invention relates to a plant cultivation device having a drainage purification function for purifying wastewater.

[0002]

BACKGROUND OF THE INVENTION Livestock manure is considered to be a useful resource for agriculture, containing many fertilizer components such as nitrogen, phosphorus and potash. However, there are many cases that cause pollution of the surrounding waters, and there is a demand for resource-reuse-type treatment. The wastewater purification method using plants and the like is an excellent treatment method in terms of energy saving and resource recycling, but has various problems.

As a method of purifying wastewater using plants, a technique using reeds is known. However, since soil or zeolite is used for planting plants, it depends on purification by adsorption to soil and the like. I have.

[0004]

The wastewater purification method using plants or the like has the following problems. . Since the roots of plants become lacking in oxygen, they cannot be applied to wastewater purification containing organic substances and high concentrations of nitrogen and phosphorus. . Since purification depends on absorption by plants, applicable wastewater is limited to wastewater having a nitrogen / phosphorus content of several ppm level. . The conventional aeration method using a diffuser tube or the like involves a large amount of power consumption and is not efficient for supplying oxygen to the roots of plants.

In the wastewater purification method using reeds,
There were the following problems. a. Since it depends on purification by the adsorption phenomenon to the soil or the like, it is necessary to periodically replace the soil, which is problematic in terms of labor and cost. b. Due to the problem of oxygen supply to plant roots, adaptable plants are limited to aquatic plants and the like. c. There is a wastewater treatment method in which aeration is performed using an ultrafiltration membrane or a microfiltration membrane, but there is no purification method combined with plants.

The present invention has been made to solve the above-mentioned problems and problems. A membrane module is provided below a plant to supply pressurized air to the surface of the membrane module. An object of the present invention is to provide a plant cultivation apparatus having a drainage purification function of absorbing and decomposing fertilizer components by a biofilm formed by roots of a formed plant to purify high-load wastewater.

[0007]

In order to achieve the above object, the present invention provides a method for planting a plant in a water-resistant container having an open top and supplying high-load wastewater containing a fertilizer component. Under the plant, a membrane module with minute voids that allow air to pass through without allowing water to pass through is installed, and pressurized air is supplied from the surface side of this membrane module by a compressor, and the root of the plant is planted. It is characterized by supplying oxygen to the water and absorbing and decomposing fertilizer components by a biofilm of plant roots formed on the surface of the membrane module to purify high-load wastewater.

[0008]

According to the plant cultivation apparatus having a drainage purification function of the present invention having the above-described structure, the supply of oxygen by pressurized air from the membrane module immersed in high-load wastewater to the roots of the plants planted in the container is performed. Done. The air bubbles are made finer by the compressor, and the plant roots are brought into direct contact with the membrane module, so that a very small amount of air enables extremely efficient oxygen supply. This makes it possible to significantly reduce the power consumption for supplying oxygen. In addition, the fertilizer component in the high-load wastewater is absorbed and purified by the module membrane and the biofilm formed on the surface of the plant root, and the wastewater treatment effect is improved. Furthermore, the efficiency of absorption of fertilizer into the plant is improved, the growth of the plant is promoted, and the yield and quality are improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. The plant cultivation apparatus 1 having a drainage purification function according to the present invention uses a container 2 similar to that used for hydroponic cultivation, comprising a water-resistant water tank having an open upper part. Is planted on a planting bed 4 made of a material such as a Styrofoam plate, and a high-load wastewater 5 such as livestock manure containing a fertilizer component is planted.
Is supplied diluted with water. On the lower side of the plant 3,
A membrane module 6 having minute voids that allow air to pass therethrough without passing water is provided. The air pressurized by the compressor 7 is supplied from the front side of the membrane module 6 through the air supply pipe 8.

[0010] In the plant cultivation apparatus 1 having the drainage purification function having such a configuration, the pressurized air supplied from the air supply pipe 8 hits the membrane module 6 to make air bubbles fine, and the roots come into direct contact therewith. Efficient plant 3
The supply of air to the biofilm 9 in which the roots 3a of the plant 3 are entangled with the membrane module 6 is efficiently performed. Then, the fertilizer component in the high-load wastewater 5 is absorbed into the plant 3 from the biofilm 9 and the root 3a together with the water, and is decomposed. As a result, the root 3 of the plant 3
a and the power consumption for supplying oxygen to the biofilm 9 can be significantly reduced. Further, it can be expected that wastewater will be purified by the biofilm 9 formed in association with the membrane module 6,
The processing effect is improved. Further, the growth of the plant body 3 is promoted by sufficient oxygen supply and fertilizer component absorption, and high yield can be expected.

FIG. 2 shows the foliage of a plant 3 (Ultra Sorgo) cultivated by using a plant cultivation apparatus 1 (with ventilation) having a drainage purification function according to the present invention and a conventional apparatus (without ventilation). 3 shows a graph comparing the dry weight of the root and the root.
As is clear from this graph, both the foliage and roots have a plant cultivation apparatus 1 having a drainage purification function (with ventilation).
It has been proven that cultivation at higher yields better dry weight and gives better results.

[0012]

As described above, according to the plant cultivation apparatus having a drainage purification function of the present invention, the plant is planted in a water-resistant container having an open upper part, and a high load containing fertilizer components. A wastewater is supplied, and a membrane module having a small gap that allows air to pass therethrough without allowing water to pass through is provided below the plant body, and the compressed air is supplied from the surface side of the membrane module by a compressor. It supplies oxygen to plant roots and absorbs and decomposes fertilizer components by the biofilm of plant roots formed on the surface of the membrane module to purify high-load wastewater. be able to.

A. For roots of plants planted in containers,
Oxygen can be supplied by pressurized air from the membrane module immersed in high-load wastewater. B. The air bubbles are made finer by the compressor, and the plant roots are brought into direct contact with the membrane module, so that a very small amount of air can be supplied extremely efficiently. C. This makes it possible to significantly reduce the power consumption for supplying oxygen. D. Further, the fertilizer components in the high-load wastewater are absorbed and purified by the biofilm formed by the plant roots formed on the membrane module membrane surface, and the wastewater treatment effect is improved.
E. Further, the absorption efficiency of the fertilizer into the plant is improved, the growth of the plant is promoted, and the yield and quality can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a plant cultivation apparatus having a drainage purification function according to the present invention.

FIG. 2 is a graph comparing dry weights of foliage and roots when a plant is cultivated using a plant cultivation apparatus (with ventilation) having a drainage purification function according to the present invention and a conventional apparatus (without ventilation). It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plant cultivation apparatus provided with drainage purification function 2 Container 3 Plant 3a Root 4 Constant planting floor 5 High load drainage (livestock manure) 6 Membrane module 7 Compressor 8 Air supply pipe 9 Biofilm (root of plant)

Claims (1)

[Claims] 1. Plants are planted in a water-resistant container having an open top, and high-load wastewater containing a fertilizer component is supplied. Air is allowed to pass through the lower side of the plant without passing water. A membrane module with minute voids is provided, and compressed air is supplied by a compressor from the surface side of this membrane module to supply oxygen to the roots of the plant and to form the plant formed on the surface of the membrane module. A plant cultivation apparatus having a drainage purification function, wherein a high load wastewater is purified by absorbing and decomposing a fertilizer component by a biofilm formed by roots of the roots.