Method for high-speed mechanical cyclone separation of activated sludge biomass

Abstract

The invention relates to a method for high-speed mechanical cyclone separation of activated sludge biomass. The biomass comprises extracellular substances and intracellular substances. The method comprises the following steps: high-speed rotating mechanical force directly acts on activated sludge, and meanwhile, hydraulic cyclone is formed; and under the dual action of crushing of high-speed mechanical force and hydrocyclone, activated sludge biomass is separated and eluted. According to the method, a high-speed mechanical cyclone method is adopted, so that a mechanical, hydraulic, temperatureand chemical comprehensive effect is formed under the assistance of hot alkali conditions, extracellular substances in the activated sludge are emphatically separated and eluted, and the separation,elution, hydrolysis and extraction efficiency of the activated sludge biomass is greatly improved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method for separating activated sludge biomass under the double action of high-speed mechanical crushing and hydrocyclone. Background technique [0002] The sludge produced by urban sewage treatment plants has not been effectively treated for a long time, and the problem of environmental pollution has become increasingly prominent; the sanitary landfill and dry incineration treatment methods adopted in recent years not only consume a lot of land and energy, but also still have environmental risks. Relevant state departments have clearly put forward the goal of "green, circular, and low-carbon" sludge treatment, and require that the utilization of "resources" be strengthened on the premise of ensuring "harmless". Under the guidance and promotion of national policies, emerging sludge treatment technologies aimed at improving the efficiency of "recycling" have emerged. Th...

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Problems solved by technology

In terms of mechanism, the anaerobic digestion process of this technology decomposes and destroys the protein substances of activated sludge, and the high concentration of ammonia nitrogen in the produced liquid is easy to decompose and volatilize. The current technical conditions are not yet suitable for the production of high-value resources. The possibility of the product, in most cases, can only be discharged through sewage treatment to meet the standard

[0007] (2) The treatment of high ammonia nitrogen wastewater is difficult and costly. The currently used nitrification and denitrification denitrification process not only consumes a lot of energy, but also needs to add a large amount of carbon sources, and the cost is huge; the emerging process of anaerobic ammonium oxidation is only in the experimental stage. Does not have the conditions for large-scale engineering

[0008] (3) The concentration of refractory organic matter is high and the treatment is difficult. The high temperature (160°C-180°C) environment in the thermal hydrolysis process leads to the intensification of the "Maillard" reaction, forming high concentrations of refractory organic matter and chroma, making the sewage It is extremely difficult to meet the standards, and the risk of exceeding the standards is extremely high

[0009] (4) It is difficult to dewater the final sludge. To achieve a mud cake with a moisture content of less than 60%, it is necessary to add a large amount of chemicals (especially acidic substances) before dehydration, which not only increases the cost, but also affects the subsequent dehydration liquid treatment and mud cake. Take advantage of disadvantages

[0013] (1) The reaction mechanism is single, completely dependent on alkali-thermal reaction, the efficiency is low, and because of the low temperature difference, the effect of flash breaking the wall is not obvious

[0014] (2) Alkaline heat conditions are difficult to balance. Lime and sludge are heated separately in the reaction vessel, completely relying on paddle stirring (low speed) mixing, and the uniformity of alkalinity and temperature is restricted

[0015] (3) The reaction time is long. After reaching the design temperature, the reaction time reaches 110 minutes, and the cost and energy consumption of the reaction vessel are relatively high.

[0016] (4) Long process chain, various equipment, high investment, large land occupation, and relatively complicated maintenance and management

[0017] In addition, the above two technical solutions focus on cell wall breaking to obtain intracellular substances, but cell wall breaking is extremely difficult, and methods such as strong acid-base corrosion, high-temperature thermal hydrolysis and flash evaporation, and long-term hot-alkali reaction are used. Realization, high cost, high energy consumption, and possible risk of chemical pollution, etc., especially, the method of hot-alkali reaction alone takes a long time and is affected by temperature and alkali mixing speed and uniformity

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