Patent Application
20150354893
The present invention relates to the treatment of sludge and, more particularly, to a green house utilizing mirrors for the treatment of sludge.
Sewage sludge is produced from the treatment of wastewater and consists of two basic forms: raw primary sludge (fecal matter); and secondary sludge (a living ‘culture’ of organisms that help remove contaminants from wastewater before it is returned to rivers or the sea). The sludge is transformed into biosolids using a number of complex treatments such as digestion, thickening, dewatering, drying, and lime/alkaline stabilization. Treating the sludge as efficiently and effectively as possible is desired to save time, money and space.
As can be seen, there is a need for more effective and efficient systems of treating sludge.
In one aspect of the present invention, a method of treating sludge comprises: providing a green house comprising: a base; at least one sidewall protruding from the base forming a receptacle in between; a transparent top covering the receptacle; and a mirrored surface within the receptacle and facing towards the receptacle; loading sludge into the receptacle; and heating the sludge by providing a source of light to shine through the transparent top, wherein the mirrored surface enhances the heat of the light, converting the sludge into fertilizer.
These and other features, aspects and advantages of the present invention will become better understood with reference to the following drawings, description and claims.
The following detailed description is of the best currently contemplated modes of carrying out exemplary embodiments of the invention. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention, since the scope of the invention is best defined by the appended claims.
The present invention includes a greenhouse with mirrors, such as steel mirrors, on the North wall to reflect more sunlight on sludge. The present invention may speed up the drying of biosolids (sludge) from Wastewater treatment plants. By adding mirrors to the back side of a greenhouse more sunlight is sent to the floor of the greenhouse and the biosolids dry faster. Sunlight comes through the clear greenhouse roof and from a south wall. The sunlight then hits the drying bed floor or hits the steel mirror and is reflected to the floor of the drying bed. The present invention thereby removes moisture from the biosolids. The present invention may decrease the amount of cubic feet of biosolids needed for disposal or further processing.
Referring to
In certain embodiments, the at least one sidewall 14 may include four sidewalls 14. For example, the four sidewalls 14 may include a front wall 18, a rear wall 20, a first wall 19 and a second wall 21. The four sidewalls 14 may form a parallelogram. In certain embodiments, the front wall 18, the first wall 19 and the second wall 21 are substantially transparent. The rear wall 20 may include the mirrored surface 26. In certain embodiments, the mirrored surface 26 may be attached to the North end of the sidewall 14. Therefore, the rear wall 20 may be the North end of the greenhouse 10.
In certain embodiments, the rear wall 20 may have a greater height than the front wall 18. The first wall 19 and the second wall 21 are connected to both the rear wall 20 and the front wall 18, and may thereby taper downward from the rear wall 20 to the front wall 18. The transparent top 22 may be attached to the top rim of the sidewalls 14. Therefore, the transparent top 22 is disposed at an angle relative to the base 15. In certain embodiments, the rear wall 20 may be positioned at an angle towards the base 15, and thereby reflect more light onto the sludge.
The base 15 of the present invention may be made of concrete, or any appropriate material. A steel plate 17 may cover the concrete base 15. Alternatively, the steel plate 17 may cover a heat retaining chamber. The base 15 of the present invention may be heated by the heat retaining chamber to aid in the drying process of the sludge. In certain embodiments, the heat retaining chamber may secure hot air within. The hot air may be produced within the base 15 using a gas heater or alternatively, an electric heater. The electric heater may be powered by a renewably energy, such as the solar power or wind power. The hot air may also be blown below the base 15 via a wastewater treatment plant blower.
In certain embodiments, the base 15 may be heated by a hot liquid, such as water. The water may be stored under the base 15 in the heat retaining chamber. A metal plate, such as a steel plate, may form the heat retaining chamber. On sunny days, the sun may heat the metal plate using direct sunlight, spot Fresnel lenses or linear Fresnel lenses, which in turn heats the water. By heating the water during the day, the sludge will continue to dry over night. Further, on a rainy or cloudy day, the steel floor may continue to transfer heat to the sludge. Other than the sun, the water may be heated by an electric or gas water heater. In certain embodiments, the electric water heater may be powered by a renewable energy, such as solar power or wind power.
In certain embodiments, the heat retaining chamber may include a piping 16 that is embedded within the concrete. The piping 16 may be connected to a circulator 29. The circulator 29 may pump hot air or water though the piping 16 to heat the base 15. Such embodiments may be used to speed up the process of drying the sludge. For example, in colder climates, the additional heat added to the base 15 may significantly aid in the process of treatment.
The present invention may further include a bio-filter 12. The bio-filter 12 may be operatively connected through the sidewall 14 and into the receptacle. The bio-filter 12 may contain wood chips. A vacuum or fan may remove air from the receptacle and blow the air into the bio-filter 12. The bio-filter 12 may remove the odor of the sludge during treatment.
In certain embodiments, the present invention may include a plurality of tracks 24 running along at least a portion of the inner perimeter of the receptacle. In certain embodiments, the tracks 24 may also include a second mirrored surface 28 to further add reflection of light within the receptacle. The tracks 24 may be used to receive a Fresnel panel frame including Fresnel panels. The Fresnel panels may be used to magnify the light and further heat the sludge.
It should be understood, of course, that the foregoing relates to exemplary embodiments of the invention and that modifications may be made without departing from the spirit and scope of the invention as set forth in the following claims.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14298468 | Jun 2014 | US |
| Child | 14693404 | US |
