Oxygen supply system special for oxygen-rich fermentation of sludge

Abstract

The invention discloses an oxygen supply system special for oxygen-rich fermentation of sludge. The oxygen supply system comprises an air pressuring and drying system, a plurality of adsorption towers, an automatic switching valve set and an oxygen buffering tank, wherein the oxygen supply system separates oxygen in air by a pressure-variable adsorption technology, then oxygen is directly supplied to a fermentation system, and oxygen is supplied by oxygen rather than air, so that the oxygen concentration can be increased, and the oxygen supply of the fermentation system can be guaranteed; furthermore, when oxygen charged into the fermentation system is fixed in gross, the flow of the gas charged into the fermentation system from the oxygen supply system can be greatly reduced compared with air, therefore, the phenomenon that the fermentation temperature decreases because of over-large gas flow can be avoided.

Description

technical field [0001] The invention relates to a special oxygen supply system for sludge oxygen-enriched fermentation. Background technique [0002] Industrial and agricultural production and urban domestic wastewater treatment produce a large amount of sludge. At present, the commonly used sludge disposal methods include landfill, incineration and land use. The sludge disposal method determines the sludge treatment method, among which high-temperature aerobic fermentation is the most commonly used technical means. [0003] Sludge high-temperature aerobic fermentation TAF (Thermophilic Aerobic Fermentation) means that the organic matter in the sludge is fermented and decomposed under the action of aerobic microorganisms during the process of sludge stacking under certain forms of aerobic conditions. Aerobic fermentation is an exothermic reaction, during which the temperature rises above 55°C, so after fermentation, the sludge is stabilized on the one hand, and the pathoge...

AI Technical Summary

Problems solved by technology

In fact, on the issue of oxygen supply, the key issue is not whether the total amount of oxygen supplied to the fermentation system is sufficient, but how to ensure that there is oxygen at all times without excessive ventilation, that is, on the one hand, it is necessary to avoid insufficient oxygen supply. If the fermentation process takes too long, it will generate bad smell at the same time; on the other hand, it is necessary to avoid excessive ventilation, which will lead to a drop in fermentation temperature, a decrease in reaction speed, excessive production of semi-products, and high energy consumption and operating costs.

Existing means of forced ventilation or natural ventilation are difficult to solve the above key problems

Images