Ultrasonic ozone compound sludge reducing method coupled with Carrousel oxidation ditch and equipment thereof

Abstract

The invention provides an ultrasonic ozone compound sludge reducing method coupled with a Carrousel oxidation ditch and equipment thereof and belongs to the technical field of residual sludge treatment. The method comprises the following steps: 1) mixing residual sludge of the Carrousel oxidation ditch with ozone to obtain a gas-liquid mixture, wherein the ozone amount is 0.01 to 0.1gO3 / gTSS; 2) under ultrasonic treatment, performing pressurized sludge reduction on the gas-liquid mixture to obtain a reduced mixed solution, wherein the ultrasonic frequency is 50 to 100KHz, and the ultrasonic sound energy density is 0.2 to 0.3w / ml; 3) performing phosphorus recovery on the reduced mixed solution to obtain phosphorus-recovered material liquid, performing solid-liquid separation on the phosphor-recovered material liquid to obtain liquid supernatant and refluxing the liquid supernatant back to the Carrousel oxidation ditch. The method disclosed by the invention has the advantages of simpleness in operation, low cost and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of excess sludge treatment, and in particular relates to an ultrasonic ozone composite sludge reduction method coupled with a Carrousel oxidation ditch and equipment thereof. Background technique [0002] The activated sludge process is a sewage treatment method. Because of its low cost, good effluent quality and wide application range, it has become the main process used in sewage treatment plants. As one of the main implementation processes of activated sludge sewage treatment technology, Carrousel oxidation ditch is widely used by sewage treatment plants at home and abroad because of its strong denitrification ability, low sludge yield coefficient, and small floor area. . Carrousel oxidation ditch process structures mainly include grille, anaerobic zone, oxidation ditch, secondary sedimentation tank, etc., which have high removal efficiency of COD and ammonia nitrogen, and are currently a relatively matu...

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Problems solved by technology

Concentration and dehydration only reduces the volume of sludge, but does not really reduce sludge; sludge digestion can reduce the amount of excess sludge and recover part of methane at the same time, but it occupies a large area and its process is relatively complicated. In large-scale sewage treatment plants, while sludge digestion and recovery of methane are limited by conditions such as weather and process operation conditions, the stability of the methane recovery process is poor, and it is difficult to achieve stable operation; sludge landfill technology occupies a large amount of land resources, and due to The amount of residual sludge is large and contains harmful substances such as pathogens and heavy metals, which has a very high risk of secondary pollution; the incineration process needs to realize sludge drying first, which consumes a lot of energy, and sludge incineration technology may produce fly ash, SO 2 Secondary pollution such as secondary pollution; sludge biological treatment land use technology mainly uses earthworms and other organisms to achieve sludge reduction, but it occupies a large area, and heavy metals, toxic and harmful substances in the sludge may leak, causing secondary pollution. secondary pollution

[0004] There are various disadvantages in the traditional method of excess sludge reduction. In the current situation where the amount of excess sludge is increasing, how to treat excess sludge with simplicity, low cost, and no secondary pollution has become an urgent problem to be solved in the field of excess sludge treatment technology. question

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