Non-contaminative incineration process for treating waste

Abstract

 The invention relates to a process for treating waste, which comprises the steps of:

a) putting burnable material onto a bottom of an incinerator;

b) burning the burnable material to red-hot ash;

c) putting waste on the top of the red-hot ash; and

d) covering the waste with grain hull.

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a process for treating waste, and more particularly, to a non-contaminative incineration process for treating organic waste.

[0002] A variety of processes have been previously investigated on treating waste. However, all of these treatment processes have either too high a cost or poor efficacy.

[0003] Among the well-known treatment processes for organic waste, such as animal carcasses, plastics, rubbers, leathers, polymers or paper, burning is the most familiar process for those skilled in this art. However, because the content of the waste are so complicated and unpredictable, there are many poisonous and harmful materials, including N_xO_x, C_xO_x, S_xO_x or particulate produced after burning the organic waste. These poisonous and harmful materials will dramatically destroy the environment and violently affect biological chains. Thus, it is very important to eliminate these poisonous and harmful materials from dispersing into the atmosphere when organic waste is burned. Another treatment process, a burying process, is impractical and expensive (many organic components will not decay for thousands of years); thus, the burying process is unfit for the increasingly limited area of the world.

SUMMARY OF THE INVENTION

[0004] The present invention provides a simple, low cost and non-contaminative process with high efficacy to treat waste, especially organic waste.

[0005] It is therefore a primary object of the present invention to provide a process for treating waste which mitigates and/or obviates the above-mentioned drawbacks of conventional processes.

[0006] Another object of the present invention is to provide a process for treating waste which is non-contaminative to the environment.

[0007] A further object of the present invention is to provide a process for treating waste which is simple and cost effective.

[0008] Another object of the present invention is to provide a process for treating waste which is more efficient than well-known burying and burning processes.

[0009] Additional features and objects that will be apparent from the detailed description of the preferred embodiment, and are achieved by a process comprising the steps of a) putting burnable material onto the bottom of an incinerator; b) burning the burnable material to red-hot ash; c) putting waste over the red-hot ash; and d) covering the waste with grain hull.

BRIEF DESCRIPTION OF THE DRAWING

[0010] Fig. 1 is a cross-sectional view of an incinerator shown in a preferred embodiment according to the present invention, showing a pig carcass displaced in rice hull.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0011] A process for treating waste according to the present invention comprises the steps of:

a) putting burnable material onto the bottom of an incinerator;

b) burning the burnable material to red-hot ash;

c) putting waste over the red-hot ash; and

d) covering the waste with grain hull.

[0012] The grain hull contains a great amount of enthalpy, for example each kilogram rice hull contains about 3,365 kilocalories. Therefore, it will release a great amount of heat while burning. Additionally, the organic waste is usually a burnable material; therefore, the organic waste is easily incinerated under the cover of the grain hul. Furthermore, this produced heat is sufficient to maintain the entire incineration reaction at high temperatures. That is, the temperature at the center of the incinerator is maintained at more than 500^oC.

[0013] For convenience, according to the present invention, the applicant takes the example of burning a pig carcass with rice hull as a preferred embodiment. Table I shows the content of rice hull.

TABLE I

moisture content 7.29%
	crude protein 3.46%
	crude fat 1.95%
dry materials 92.7%	crude fiber 32.4%
	crude ash 15.3%
	nitrogen free-extract 39.6%

[0014] With reference to Fig.1, firstly, a certain amount of rice hull is put onto the bottom of an incinerator 1. The rice hull is then burned. After several hours of burning, as some rice hull which is still red-hot remains, the pig carcass is placed on the red-hot ash and is covered thoroughly with additional rice hull. The heat from the red-hot ash is sufficient to cause the pig carcass to be incinerated under the cover of the rice hull. Since the pig carcass is also a burnable material, it is easily incinerated. Furthermore, the produced ash will insulate the heat produced from incineration of the pig's body; therefore, little heat escapes to the outside of the incinerator. Therefore, the temperature in the almost closed system rises to more than 500^oC and can be maintained throughout the entire incineration reaction. As a result, the pig carcass is thoroughly incinerated to ash.

[0015] As most of the pig carcass is incinerated to ash, another pig carcass can be placed on the rice hull. Additional rice hull is subsequently placed on to cover the pig carcass thoroughly. Thus, another incinerating reaction can be carried out. Therefore, the process according to the present invention can be a continuing process.

Example

[0016] About 20 kg of rice hull is placed on the bottom of an incinerator and is fired from the top layer of the rice hull. After several hours of incineration, for example, eight hours, about a 40 kg pig carcass is placed on the incinerated rice hull and additional rice hull is placed on top to cover the pig carcass thoroughly. After incinerating overnight, an additional 40 kg pig carcass is added to the rice hull and further rice hull is added to cover the pig carcass thoroughly. After two hours of incineration, samples of the gas emitted are taken from the flue duct of the incinerator for the next five hours. The temperature in the incinerator is 528^oC and the following are test results of the particulate, sulfric oxide, and nitric oxide of the gas emitted from the flue duct of the incinerator according to the present application.

Determination of Particulate Content

[0017] Sampling Site: Incinerator Flue Duct
Wet Base Emission Rate: 49Nm³/min
Dry Base Emission Rate: 48Nm³/min

Determination of Sulfric Oxides

[0018] Sampling Site: Incinerator Flue Duct
Barometric Pressure: 758 mmHg
Ba-pb-Acetate Conc. Factor: 0.9936
Blank Titration: 0.14 ml

Sample I.D	Sampling Volume V'N (NL)	Sampling Solution Volume (mL)	Analyzed Volume ν (mL)	Titration Volume a (m l )			Sulfric Oxide as SOx (ppm)
				1 st Volume	2 nd Volume	Average Volume
S110313	17.433	250	10	0.16	0.16	0.14	3
S110314	17.433	250	10	0.17	0.16	0.17	5
S110315	17.451	250	10	0.15	0.14	0.15	2
	* * * blank below this row * * *

Formula of Calculation :

Determination of Nitric Oxides

[0019] Sampling Site: Incinerator Flue Duct
Barometric Pressure: 760 mmHg

[0020] As can be understood from this example, the test values of particulate, sulfric oxide and nitric oxide are respectively 14 mg/NM³, less than 50 ppm, and less than 10 ppm, which are within the standards of Taiwan's current environmental protection plan (250, 750 and 500). Therefore, it is no doubt that the present application is an excellent process for treating waste, especially organic waste, meeting all the requirements of environment protection in the world.

[0021] Attached is a test report of the present application, which is carried out by Best Environment Corporation, which is an accredited laboratory by the Environment Protection Agency of Taiwan, Serial No. 019.

[0022] For the purpose of the present invention, the grain hull can be of+6X rice, barley, oats, wheat, rye, buckwheat, millets, sorghum, etc.

[0023] While the present invention has been explained in relation to its preferred embodiment, it is to be understood that various modifications thereof will be apparent to those skilled in the art upon reading this specification. Therefore, it is to be understood that the invention disclosed herein is intended to cover all such modifications as fall within the scope of the appended claims.

Claims

1. A process for treating waste comprising the steps of:

a) putting burnable material onto a bottom of an incinerator;

b) burning said burnable material to red-hot ash;

c) putting waste on top of said red-hot ash; and

d) covering said waste with grain hull.

2. A process of claim 1, wherein said grain hull is the hull of rice, barley, oats, wheat, rye, buckwheat, millets, or sorghum.

3. A process of claim 1, wherein said waste is animal carcasses, plastics, leathers, rubbers, polymers or paper.

Drawing