Method of Aerobic Treatment of Poultry Manure and Apparatus for Producing Organic Fertilizer

Abstract

A bio-chamber and a method of making organic fertilizer from poultry manure. The bio-chamber has a chamber body that defines a receiving chamber and an aeration chamber. The aeration chamber underlies the receiving chamber and is divided therefrom by a partition. The partition has a plurality of holes formed therein. An oxygen probe and a temperature probe are positioned inside the receiving chamber. An air blower is connected to the aeration chamber and is operable to blow air therein. The method comprises: mixing the poultry manure with a carbon carrier; loading the mixture into the receiving chamber; monitoring the temperature and the oxygen concentration of the mixture; aerating the mixture; and regulating the temperature and the oxygen concentration by adjusting the operation of the air blower. The temperature and oxygen concentration are regulated to provide conditions that permit aerobic bacteria to propagate and biodegrade the mixture.

Description

RELATED APPLICATIONS[0001]This application is a divisional application of U.S. patent application Ser. No. 14 / 138259 filed on Dec. 23, 2013.[0002]This application claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Patent Application Ser. No. 61 / 752,021, filed Jan. 14, 2013, which is hereby incorporated by reference.FIELD OF THE INVENTION[0003]The present invention relates to the field of processing and treatment of poultry wastes, especially chicken manure / excrements and to the field of making organic fertilizers. The invention can be used for the industrial production of organic fertilizer from chicken manure, which can be applied to restore depleted and eroded soils and increase agricultural crop yields grown on them.BACKGROUND OF THE INVENTION[0004]Poultry production operations generate significant quantities of animal waste, mainly manure. Vegetation chemically burns from direct contact with excrements containing ammonia. Poultry manure can contaminate the surface or ...

AI Technical Summary

Benefits of technology

[0010]Chicken excrements consist of raw organic matter in a large fraction, which in combination with other nutrients is a major component of the fertility of a vegetative layer of soil. If it is properly treated and decomposed it becomes good fertilizer. The present invention is a simplified method of aerobic treatment of poultry manure mixed with a carbon carrier such as sawdust under controlled conditions. It is well known that for rapid development and vital activity of aerobic bacteria, and hence for rapid aerobic decomposition of the mass, oxygen supply is needed. This invention is about how to provide adequate oxygen supply (i.e. a method of proper, even aeration) for optimum development and propagation of aerobic bacteria. This is achieved by monitoring temperature and oxygen concentration, which provide a good indication of proper aeration and development of the decomposition process. A short decomposition time, such as only 3-5 days, can be achieved by this method.

[0011]The invention also provides an inexpensive and simple apparatus for making the fertilizer. The main element in the production line is a specially designed bio-chamber where the biodegradation occurs. The constructive design of the bio-chamber allows for even and uniform distribution of the air and very simple maintenance of the bio-chamber itself. Furthermore, the bio-chamber does not require any actions such as turning over, spinning or agitating, which significantly simplifies the production process and reduces costs. Preferably an open top twenty or forty foot sea container or shipping container can be repurposed for use as the main component of the bio-chamber. These are inexpensive and easy to obtain. Their dimensions can slightly vary, but are approximately height 2.3 m, width 2.3 m and length 6 m or 12 m.

[0012]Properly mixed raw materials are placed into a bio-chamber equipped with temperature and oxygen probes. Airflow is supplied by a high pressure air blower. Uniform distribution of the air is provided by a specially designed double bottom of the bio-chamber and by the pressurized (forced) airflow. Air penetrates all layers, and there is no need to agitate or turn the mass. There is no need to treat the mass with mechanical compression, friction, exposure to rays or radiation (including but not limited to super high frequency radiation). Also there is no need to pre-heat the air. Intermittent (pulse) air supply reduces power consumption. There is furthermore no need to add additional substances such as acids, ferments, enzymes, bio-catalysts, accelerating agents, worms, etc. Furthermore, the process requires significantly less time and space than composting.

[0014]Using this method, high quality organic fertilizer can be produced within only 3-5 days in an inexpensive production line that can be easily built with existing machinery. As there is no need for specially developed or sophisticated equipment, and no additives are required, the invention provides a cheaper production process. Only the bio-chamber where the process of biological decomposition of organic matter will occur needs to be constructed. This does not require a lot of work or materials. Furthermore, the production process is environmentally friendly and waste-free, and the production line is scalable and flexible.

[0022]In another aspect, the present invention resides in a method of making organic fertilizer from poultry manure mixed with a carbon carrier, the method comprising: mixing the poultry manure with the carbon carrier; loading the poultry manure and the carbon carrier into the receiving chamber of the bio-chamber; monitoring a temperature of the mixture and an oxygen concentration of the mixture; evenly and fully aerating all layers of the mixture with the at least one air blower; and regulating the temperature of the mixture and the oxygen concentration of the mixture by adjusting the operation of the at least one air blower, to provide conditions that permit aerobic bacteria to propagate and biodegrade the mixture.

[0027]The organic fertilizer produced by this method can have more than 50% organic material, a nitrogen:phosphorus:potassium ratio from 2-2.5-2.5 up to 2.7-3.0-3.0, and be free of pathogens, salmonella, and weed seeds.

Problems solved by technology

Poultry production operations generate significant quantities of animal waste, mainly manure.

Poultry manure can contaminate the surface or groundwater resources through leaching and runoff of contaminants.

Runoff from factory farms can go into nearby rivers, lakes and results in fish-kills, dead-zones, closed beaches, and long-term damage to fisheries / ecosystems.

In many areas manure causes dangerous contamination of the drinking water due to nitrates.

Poultry manure also contains bacteria and pathogens which may also potentially affect soil, water, and food resources.

Lack of appropriate treating methods and the bad odor of chicken excrements has created a social problem.

Most of them are not efficient, not scalable and not economical.

Composting requires several months, a significant amount of land or other space, and a lot labor for managing compost piles such as mixing, turning etc. which leads to high labor costs.

Furthermore, compost can attract insects, and disease-producing organisms may not be adequately controlled.

Another problem with composting is odor nuisances.

Treating chicken manure with high temperatures requires significant power consumption and results in loss of organic matter.

Furthermore, because dried chicken excrements have not gone through the biological decomposition stage, they cannot contribute to humus.

Other methods require either additional components such as different acids, ferments, enzymes, bio-catalysts, accelerating agents, worms etc. or sophisticated and expensive equipment, which must be specially designed and constructed.

In many methods aeration is uneven.

Some parts of the mass are excessively aerated and some parts are not aerated enough.

Both conditions cannot provide the optimum development of aerobic bacteria.

The maintenance for such a construction is not easy.

If the holes are clogged by the mass then it becomes difficult to clean them.

But despite the increasing use of chemical fertilizers, agricultural crop yield is gradually and constantly decreasing.

It has been found that the exclusive and prolonged use of chemical fertilizer is harmful to the soil's ability to restore its fertility due to depleted humus.

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