Bidirectional ventilation and pneumatic pile-turning composting process

Abstract

The invention discloses a bidirectional flow ventilation and air pressure composting method, which comprises the following steps: dwelling pile body with height at 2-2. 5m and upper margin at 0. 5-1. 0m in box compost reactor; inserting three heat indicators and three pile body gap gas sampling pipe into different height; adopting 0. 1-0. 2m3 / min fixing air quantity per m3 initial compost raw material and batch process; venting; changing the direction of ventilation when the biggest differential temperature more than 5 deg. c of the three heat indicators; turning over the pile at the second day for one time one day; compressing the air with impulse; discharging momentary; making the pile body float and drop; testing oxygen concentration of the gas in the pile body per 15 min; finishing the compost when the biggest differential value less than 1. 0% of adjacent twice. This invention possesses low operating cost without twice pollution, which can be used to the compost of life garbage, agricultural waste and sludge of the waste water treatment plant.

Description

technical field [0001] A two-way ventilation and air pressure turning composting method, relating to a composting main fermentation process, specifically a composting main fermentation process for domestic garbage, agricultural waste, and sewage treatment plant sludge, belonging to the technical field of solid waste treatment and resource utilization . Background technique [0002] Composting technology has an ancient history, and has been widely used in modern society for the harmless treatment of wastes rich in biodegradable organic matter, such as household garbage, agricultural waste, sludge from sewage treatment plants, etc., and the products of composting ( Compost) is also rich in humus and plant nutrients, suitable for land use, so that composting technology has resource value at the same time. [0003] The main mechanism of the composting process is that the organic matter in the raw material is degraded and converted into stable organic residues and CO under the m...

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Problems solved by technology

[0004] Tank-type composting reactors and bin-type composting reactors (including silo and box type) equipped with tipping and ventilating machinery are the main forms of composting main fermentation reactors (Composting of yard Trimmings and Municipal solid Waste.U.S.EPA Office of Solid Waste and Emergency Response, ashington: U.S.Environmental Protection Agency, 1994, EPA530-R-94-003), the former has the function of turning the heap during the composting process, keeping the porosity of the heap, and making the material Uniformity, to ensure the role of oxygen supply conditions for the aerobic degradation of the pile, but the pile is in a partially open state, the tail gas is not easy to collect, and it is easy to generate odor and aerosol pollution; the latter has a good seal, and the tail gas pollution is easy to collect and control. However, the pile cannot be overturned. The void ratio in the pile is easily lost due to settlement and water accumulation, resulting in a local anaerobic state, which makes the degradation of the compost material uneven, which is not conducive to achieving stabilization.

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