Bin type sludge aerobic composting method

Abstract

The invention discloses a bin type sludge aerobic composting method which comprises the following steps of: building a bin type sludge aerobic composting device which comprises a fermentation bin, a ventilating device and real-time on-line monitoring equipment; uniformly paving a PVC (Polyvinyl Chloride) spherical suspension filter material with the diameter of 50 mm in the fermentation bin, then uniformly mixing dewatered sludge and saw dust of a sewage treatment plant according to the mass ratio of sludge:saw dust of (2:1)-(5:1), and filling into the fermentation bin; controlling the water ratio and volatile organics, namely VS (Volatile Organics ), of a mixed stacked body between 60% and 70% and between 65% and 80% respectively before stacking; inserting a temperature probe rod and an oxygen probe rod into the stacked body, wherein a composting course which takes the temperature of the center point of the stacked body as a control temperature value and adopts a control strategy, namely segmented oxygen-temperature feedback ventilation, of an invention with the application number of 201310076268.9 lasts for 14-18 days in all. The bin type sludge aerobic composting method disclosed by the invention has the functions of temperature control, gas supply, gas exhaust, unstacking and on-line monitoring, realizes the integrated operation of an whole composting process and meets the process requirements for fast decomposition, high-efficiency dewatering and harmlessness.

Description

technical field [0001] The invention relates to a composting technology for stabilizing and harmless organic solid waste, in particular to a bin-type sludge aerobic composting method. Background technique [0002] With the acceleration of urbanization, the amount of urban sewage treatment has increased year by year, and the sludge production in sewage has also risen sharply. The composition of municipal sludge is complex. In addition to high moisture content and perishability, it also contains pathogenic bacteria, parasite eggs and toxic substances, and is accompanied by stench. If it enters the environment without proper treatment, it will directly pose a threat to the atmosphere, water bodies and human health. Municipal sludge is rich in organic matter and nutrients needed for plant growth and reproduction such as nitrogen, phosphorus, and potassium. Composted urban sludge can be used to produce organic fertilizers, or to improve soil, increase sealing fertility, and effe...

AI Technical Summary

Problems solved by technology

Among them, the vertical fermentation bin has a large processing capacity and occupies a small area, but it is easy to cause uneven mixing of materials, resulting in unsatisfactory partial fermentation results; the drum type fermentation bin has the advantages of small footprint, flexible operation, and low energy consumption, but its fermentation bin The cross-sectional area of ​​the bottom is large, and the lack of buffer layer to homogenize the ventilation airflow makes it easy to compact the material and even cause partial anaerobic

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