JP2006314212A - Rooftop-greening culture soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide rooftop-greening culture soil produced by effectively utilizing papermaking sludge comprising wastes. <P>SOLUTION: The rooftop-greening culture soil is produced by mixing 85-70 vol.% of material obtained by drying the papermaking sludge generated in a waste-paper recycling process and pulverizing the dried sludge, 20-10 vol.% of porous-structured Bora soil richly produced in southern Kyushu and 10-2 vol.% of charcoal material such as wood charcoal. The soil is excellent in water retention and water permeability to be suitable for planting and also light in weight to be best for building-rooftop greening, and enables effective utilization of the papermaking sludge conventionally incinerated for disposal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soil for greening, and particularly to a soil for rooftop greening that has excellent water retention and is suitable for rooftop greening of buildings and the like.

  In recent years, rooftop greening of urban buildings and the like has been recommended by many local governments as a measure against global warming, and in some cases, the obligatory of rooftop greening when building new buildings and the like is being considered by regulations. However, the greening of the roof requires a large amount of soil transfer, and there is a problem in that a load is applied to the ceiling of a building or the like. In addition, water retention, water permeability, and air permeability necessary for soil are not sufficient, and planted plants may cause root rot or grow poorly due to fungi or bacteria. Moreover, there was a risk that the soil would flow into the roof drain and contaminate the sewage.

  On the other hand, artificial soil using natural zeolite, perlite, waste plastic, etc. as a raw material has been proposed as a lightweight and suitable for rooftop greening.

  However, those using the above natural zeolite and pearlite are stable and stable over time, but are not necessarily good for the growing root zone environment of plants, and in the case of waste plastics, etc. There was a problem that it was not suitable for long-term cultivation due to lack of environmental conditions.

In order to solve these problems, the waste paper obtained by reprocessing and crushing waste paper is used as the main raw material, and paste material, filler, ceramic powder, and bamboo charcoal powder are blended into this crushed fiber. Then, after performing kneading, aging and granulation, a planting material for gardening that has been dried is introduced (see Patent Document 1).
JP 2002-125456 A

  However, in the case of the horticultural planting material proposed in Patent Document 1, it is necessary to require a dedicated production facility in order to obtain the fiber content of waste paper. Moreover, the sludge generated by the waste water treatment when collecting the fiber content of the used paper was not reused at all.

  The present invention has been made in view of the above-mentioned problems, and utilizes paper-making sludge generated in the process of recycling used paper. An object of the present invention is to provide an inexpensive roofing medium for rooftop greening that has the aptitude required as a roofing greening medium for buildings and the like.

  Another object of the present invention is to utilize and provide papermaking sludge, which has been conventionally incinerated or landfilled as industrial waste, as a main raw material for rooftop greening soil such as buildings.

  For this reason, the first feature of the present invention is that the papermaking sludge is the main component, and it is composed of mullet earth and a charcoal material such as charcoal.

  The second feature is that the volume ratio of the soil made of the paper sludge, the mullet, and the charcoal such as charcoal is 85 to 70%, 20 to 10%, and 10 to 2%, respectively. More preferable volume ratios of the soil are 85%, 13% and 2%, respectively.

  Further, a third feature is that the papermaking sludge is a waste generated in a used paper recycling process.

  According to the soil for rooftop greening according to the present invention, paper sludge and bora soil are blended, and the water retention of water is high due to the porous structure of the paper sludge and bora soil, and unnecessary water permeability is also obtained. It has a high effect, high air permeability, and excellent retention of fertilizers such as liquid fertilizer.

  Moreover, since charcoal materials, such as charcoal, are mix | blended, it has the outstanding effect that there exists an antibacterial control and deodorizing effect.

  Furthermore, since paper sludge that has been discharged in the process of recycling used paper and processed as industrial waste can be used, not only can resources be effectively used, but also an excellent effect can be provided, such as an inexpensive rooftop greening medium.

  Hereinafter, although the cultivation soil for rooftop greening of this invention is demonstrated based on an Example, it cannot be overemphasized that this invention is not limited to a present Example. FIG. 1 is an explanatory view showing a process for regenerating paper sludge used in a rooftop greening soil according to one embodiment of the present invention, and FIG. 2 is a view showing water retention of the rooftop greening soil according to one embodiment of the present invention. .

  The culture soil for rooftop greening according to the present invention is configured by mixing paper sludge, mullet soil, and charcoal at a predetermined blending ratio, and is 85 to 70%, 20 to 10%, 10 to 10 by volume ratio, respectively. 2% is preferable, and the ratios of 85%, 13% and 2% are preferable respectively. The particle size is preferably passed through a 15 mm mesh screen.

  Papermaking sludge is sludge treated from wastewater discharged in the used paper recycling process, which is regenerated by the process described later, and is composed of cellulose with a weight ratio of about 50%, so it has excellent water retention and specific gravity. A lightweight material of 0.7. Bora soil is a volcanic ejecta abundantly distributed in southern Kyushu, has a porous structure with a specific gravity of about 0.8, and is excellent in water retention and water permeability. Charcoal is a porous body having a specific gravity of 0.4, and is excellent in gas adsorbability, and is said to be effective in suppressing microorganisms and preventing nests of pest damage. The paper sludge regeneration process, water absorption, and planting performance of the soil for rooftop greening according to the present invention will be described in more detail with reference to FIGS. 1 and 2 and Tables 1 and 2.

(Regeneration of paper sludge)
As shown in FIG. 1, the waste water discharged in the used paper recycling process is first collected in a tank (S1). Next, chemicals such as a sulfuric acid band and a polymer flocculant are added and mixed (S2). Suspended matter (SS) in the wastewater is agglomerated and precipitated by the chemical (S3). The aggregated sediment is discharged from the bottom of the tank, and dewatering is performed by heating and compressing a screw press to obtain sludge having a water content of about 50% (S4). Further, the sludge is put into a pulverizer and pulverized to obtain a particle size of 15 mm or less (S5). The pulverized sludge is sun-dried to a moisture content of 5 to 10% (S6), and the papermaking sludge is regenerated.

  Paper sludge regenerated by the above composition is composed of about 50% cellulose and silica, alumina, calcium oxide, etc., and is lightweight and rich in water retention. As well as high retention of liquid fertilizer. And since it can be reused as the cultivation soil for rooftop greening which has both water permeability and air permeability by blending the above-mentioned Bora earth and charcoal, waste can be effectively utilized.

(Water retention experiment)
With respect to the three types of rooftop greening soil shown in Table 1, changes in water content over time were examined under the following conditions in order to know each water retention capacity. In other words, 30 liters of each of three types of roofing greening soils were prepared, spread on a vinyl sheet to a thickness of 3 to 4 cm in a vinyl house, stirred as needed, and allowed to stand for 4 days to dry. Next, 3 liters of the dried soil for greening the roof was put in a transparent plastic container (length 300 mm, width 400 mm, height 160 mm), and the weight was measured. Further, 10 l each of tap water was injected and allowed to stand for 3 days to be hydrated, and water that was not hydrated was drained and the weight was measured. Thereafter, the weight was measured every 5 days for 20 days, and the weight was measured again after 10 days. The results are shown in Table 2 and FIG. In the tables and figures, “a” represents a rooftop greening soil according to the present invention, “A” represents sky soil (manufactured by Sowa Chemical Industry), and “B” represents laputa soil (manufactured by Hibiya Amenis).

  As shown in Table 2 and FIG. 2, it was found that the roofing greening soils of Samples A and B all lost water retention after 30 days. Moreover, it turned out that the culture soil for rooftop greening of this invention has high water retention after 30 days.

(Planting experiment)
Three types of roofing green soil according to the present invention were prepared under the mixing conditions shown in Table 3, and each was put into a plastic planter. Gold crest (a kind of lawn) was sown in each rooftop greening soil, and 3 pieces of liquid fertilizer and water were added. When the same amount of each type was added and the growth conditions were observed in May, the top greening soil with 85% paper sludge, 13% bora soil, and 2% charcoal (volume ratio) showed the best growth.

  According to the cultivation medium for rooftop greening according to the present invention, paper sludge and bora earth and charcoal, which are industrial wastes, are used. Moreover, since it is inexpensive, it is optimal for rooftop greening of buildings. Moreover, it can be used for greening or landscaping in parks, and it is effective for reusing paper sludge, which is industrial waste.

It is explanatory drawing which shows the regeneration process process of the papermaking sludge used for the rooftop greening soil which concerns on one Example of this invention. It is a figure which shows the water retention of the cultivation soil for rooftop greening which concerns on one Example of this invention.

Claims (3)

  A soil for rooftop greening that consists mainly of paper sludge and is composed of mullet and charcoal such as charcoal.   The volume ratio of the culture soil comprised from charcoal materials, such as said papermaking sludge, mullet, and charcoal, is 85-70%, 20-10%, 10-2%, respectively. The soil for rooftop greening described.   3. The rooftop greening medium according to claim 1, wherein the papermaking sludge is a waste generated in a used paper recycling process.

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