[특허]Method of and apparatus for digesting organic waste and/or sewage sludge

Method of and apparatus for digesting organic waste and/or sewage sludge 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C02C-001/12 C05F-009/02
출원번호	US-0709378 (1976-07-28)
우선권정보	DT-2541070 (1975-09-15)
발명자 / 주소	Kneer Franz Xaver (Hanau-Mittlebuchen DT)
출원인 / 주소	Gebruder Weiss K.G. (Dillenburg DT 03)
인용정보	피인용 횟수 : 37 인용 특허 : 0

초록 ▼

Organic waste and/or sewage sludge is digested by passing it downwardly through a closed vessel while air is passed upwardly through it. The air is finely divided or distributed into the vessel so that it flows through the entire cross sectional area of the material being digested. The flow of air through the vessel is regulated by measuring the content of CO2 or O2 in the exhaust air from the vessel and comparing the measured value with a desired value. Similarly, the moisture content of the material being digested is measured in at least two spaced locations and the moisture content is compared with a desired value for determining the amount of water to be supplied into the air flowing into the vessel. In addition, the air supplied to the vessel is heated based on the temperature conditions to be maintained within the vessel. After exhaust air leaves the vessel, its heat and water contents are withdrawn and it is filtered to remove objectionable odors and other noxious matters.

대표청구항 ▼

An improved method of continuously digesting material such as organic waste and/or sewage sludge, including the steps of feeding the material to be digested into the upper end of an enclosed space, withdrawing the material after being digested from the lower end of the enclosed space, aerating the material as it moves downwardly from the upper end to the lower end of the enclosed space, and adjustably supplying the air to the material as a function of values measured within the enclosed space, wherein the improvement comprises the steps of allowing the material to pass from the upper end of the enclosed space to the lower end thereof in a continuous body forming a single mass, finely distributing the total amount of air required for the digestion process of the material over the entire cross-sectional area of the lower end of the enclosed space so that the air supplied thereto contacts the entire cross-sectional area of the mass of material taken transverse to its direction of movement through the space as the air flows through said mass of material, in a direction opposite to the movement of the material through said enclosed space, adding a regulated amount of moisture to the air introduced into the enclosed space, withdrawing the air from the upper end of the enclosed space after its upward flow through the material, monitoring one of the CO2 and O2 content of the air withdrawn from the upper end of the closed space, comparing the actual value of the one of the CO2 and O2 content monitored with a predetermined desired value, regulating the flow of the air through the enclosed space based on the comparison of the desired and monitored values by separately controlling the introduction of air into the enclosed space and controlling the withdrawl of air therefrom thereby controlling pressure gradients in the various layers of said mass so as to adjust the oxygen level flowing through said mass in desired amounts, measuring the moisture content of The material in at least two locations spaced apart in the direction between the lower end and the upper end of the closed space, comparing the actual moisture content values with predetermined desired values, regulating the amount of finely divided water added into the air being supplied to the lower end of the enclosed space based on the comparison of the desired and measured values of moisture content, and heating the air supplied to the lower end of the enclosed space to a temperature in the range of 30°to 50°C. An apparatus for digesting material such as organic waste and/or sewage sludge comprising an enclosed vertically extending reaction vessel, a material inlet at an upper end of said reaction vessel and a material outlet at a lower end therof so that said material progresses in a continuous body forming a single mass from said inlet to said outlet, a distributor in the lower end of said reaction vessel for finely distributing a flow of air into the entire horizontal cross-sectional area of said reaction vessel, a blower and a conduit extending from said blower to said distributor for supplying air to said distributor, a suction device and an exhaust line connecting said suction device and the upper end of said reaction vessel for withdrawing air from within the upper end of said reaction vessel so that said air is caused to flow through said mass in a direction opposite to the movement of said material through said vessel, a first control circuit connected to said blower and suction device for separately regulating said blower and said suction device so as to cause said air flow to traverse the entire height and over the full cross-section of said continuous mass, said first control circuit including means for measuriNg one of the CO2 and O2 values in the air withdrawn from said reaction vessel so that based on a comparison of the actually measured values of the CO2 or O2 and a predetermined desired value at least one of the amount of air supplied to said blower and withdrawn by said suction device can be regulated, a spraying device for adding finely divided water into the air flow in said conduit between said blower and said distributor so as to moisturize the air supplied to said distributor, a second control circuit connected to said spraying device for regulating the amount of water supplied into the air, a heating device connected to said conduit for heating the air being supplied to said distributor, and a third control circuit connected to said heating device for regulating the amount of heat supplied to the air flowing from said blower to said distributor, and means connected to said first, second and third control circuits for determining desired degree of regulation effected by said circuits based on predetermined desired values as compared to actually measured values in said vessel.

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Method of and apparatus for digesting organic waste and/or sewage sludge 원문보기

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