Device for enhancing ultrasonic pretreatment of municipal sludge

Abstract

The invention discloses a device for enhancing ultrasonic pretreatment of municipal sludge. The device for enhancing ultrasonic pretreatment of the municipal sludge comprises an ultrasonic reaction tank, a micron bubble water generation unit, a booster pump and a pressure gauge, wherein a sludge inlet and a sludge outlet are formed in the upper portion and the lower portion of the ultrasonic reaction tank respectively, ultrasonic wave generation units are installed on side walls of two sides of the ultrasonic reaction tank respectively, the micron bubble water generation unit is connected withthe ultrasonic reaction tank through a first connection pipe, one end of the first connection pipe extends into the ultrasonic reaction tank, a plurality of water outlet holes are formed in the extending end of the first connection pipe, and a plurality of baffles which are arranged from top to bottom in sequence in a staggered mode are installed in the ultrasonic reaction tank; and the booster pump communicates with the ultrasonic reaction tank through a second connection pipe. According to the device for enhancing ultrasonic pretreatment of the municipal sludge, the sealed reaction tank isadopted for conducting high-pressure ultrasonic pretreatment on the liquid sludge, so that in anaerobic digestion and ultrasonic pretreatment of the municipal sludge, energy consumption is low, and aneffect is good.

Description

technical field [0001] The invention relates to the technical field of sewage sludge treatment, in particular to a device for strengthening ultrasonic pretreatment of urban sludge. Background technique [0002] With the popularization and application of activated sludge method to treat domestic sewage, the output of excess sludge has increased sharply, and the sludge output has reached 43 million tons per year (calculated with a moisture content of 80%). The situation of excess sludge treatment and disposal is becoming increasingly severe. Ultrasonic pretreatment of sludge is an effective method to promote sludge decomposition, with fast decomposition speed and wide application range. The main way of ultrasonic cracking sludge is the cavitation effect, and the resulting thermal and chemical effects. Among them, cavitation is more likely to occur in the frequency range of 20-40kHz, and the low-frequency 41kHz ultrasonic wave is the most effective for sludge decomposition. D...

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Problems solved by technology

However, this patent does not take into account that the bubbles in the water will float into the air after a period of ultrasonication, and the heating of the water body will also reduce the solubility of the gas in the water, and the nanobubbles cannot exist in the water for a long time, resulting in a reduction in processing efficiency; the nanobubbles are prepared with combustible biogas , did not take into account that a large amount of ammonia, hydrogen sulfide and other gases in the biogas dissolve and accumulate in water, which is not conducive to the subsequent anaerobic digestion, and is not suitable for ultrasonic pretreatment of municipal sludge

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