Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1989-10-05
1991-10-01
Spear, Frank
Liquid purification or separation
With gas-liquid surface contact means
With separator
210232, 210293, B01D 2424
Patent
active
050531247
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotting-slab system for the treatment of loose material, in particular for composting, dewatering and the like and for the treatment of gases, by means of a bed of filter material situated on the rotting-slab system.
In the production of so-called green composts from, for example, cut grass, shredded material from trees or the like, relatively large quantities of humic acids and other pollutants are produced. So far, green composts are stored on the ground. The pollutants produced during the rotting process, which are liquid or, for example, soluble in rainwater, pass directly into the groundwater and pollute the water resources to a considerable degree.
There are furthermore biofiltration processes in which, for example, a waste gas to be purified is passed via a distribution system through a bed of filter material. As filter material, a biomass is used, composed, for example, of compost from refuse, fibrous peat or the like, the gas to be purified coming into intensive contact with the biomass as it flows through the bed via the moisture film of the carrier material. The substances to be removed from the gas are converted or broken down microbially or alternatively simply absorbed. The process operates at high moisture contents of the filter material, with the result that large quantities of liquid loaded with pollutants are produced. The process is carried out in expensive liquid-tight tanks.
The object of the invention is to create a slab system for the storage of loose material to be treated or the biofilter material, respectively, which is simple in structure, is easily laid, permits a good gas flow through the material and is liquid-tight towards the bottom.
This object is achieved by a slab system which is characterized by at least one liquid-impermeable lower slab for resting on the consolidated ground, an upper supporting slab provided with passage openings, further by spacers between the lower slab and the supporting slab to create a liquid-receiving space and/or a liquid channel system and/or a gas feed system between the two slabs and at least one liquid outlet from the space between the two slabs and/or a gas inlet.
By virtue of the system according to the invention, which can be laid out over a large area, a facility is created with very simple means which catches the liquids emerging, for example, from the compost mass or the biofilter material and prevents the pollutants from penetrating into the ground. At the same time, the system provides good aeration or a good gas flow through the filter mass from below, so that the composting or filtering process is advantageously influenced and accelerated thereby. By appropriate robust design of the slabs, the system can be driven over by vehicles and equipment.
The lower slabs can be composed of concrete. Preferably, both the lower slabs and the supporting slabs are produced from glass fibre-reinforced concrete, so that relatively thin and light slabs are adequate which can be transported and laid without great expense. Even thin slabs of glass fiber-reinforced concrete permit high point loading.
For simplification of the production and laying of the system the spacers can be attached to at least one of the two slabs.
Preferably, the spacers are arranged at equal distances from one another in perpendicularly intersecting rows, so as to create passages within the space in the two main directions.
A particular expedient embodiment of the spacers consists in these being provided in the same shape and arrangement both on the upper side of the lower slab and on the underside of the supporting slab and when the slabs are laid one on top of the other rest exactly against one another.
The abutment surfaces of the spacers, which surfaces rest against one another, are expediently round or square. At the same time, starting from the bearing surfaces, the side faces of the spacers preferably merge in an arc shape into the respective slab plane, arch-like supports thereby being created which considerably increase the loading of the s
REFERENCES:
patent: 4139640 (1979-02-01), Kipp, Jr.
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