A method and device for treating organic solid waste

Abstract

The invention discloses a method and device for treating organic solid waste. The method comprises the steps: (a) carrying out physico-chemical pretreatment, namely adding water and additives into the waste, and heating and stirring; (b) carrying out hydrolysis, namely carrying out thermal hydrolysis and acid hydrolysis on the waste which is subjected to physico-chemical pretreatment, so as to obtain a hydrolyzate; (c) carrying out oxidization, namely oxidizing the hydrolyzate, so as to obtain an oxidization product; and (d) carrying out solid-liquid separation namely carrying out solid-liquid separation on the oxidization product, so as to obtain a solid oxidization product and a liquid oxidization product.

Description

technical field [0001] The invention relates to the field of waste treatment, in particular to a method and device for treating organic solid waste and turning it into high-quality activated organic fertilizer. Background technique [0002] Traditional waste recycling methods include incineration power generation method, biochemical composting method, biogas recovery method after sanitary landfill, pyrolysis gasification method, pyrolysis oil refining method, wet oxidation material or energy recovery method, anaerobic oxidation method, solidification Building Materials Law, etc. At present, incineration power generation and biochemical composting are the main methods of recycling urban waste such as garbage and sludge. Biogas recovery from landfills is only used as an auxiliary operation under pollution control of landfills, rather than as the main method of resource recovery. Although the above three methods of power generation, composting, and landfill biogas recovery ar...

AI Technical Summary

Problems solved by technology

[0006] Question 1: The HiROS method basically uses the same process to treat various types of organic solid wastes, and operates hydrolysis and oxidation in the same stable tank, so it may cause incomplete, failure or failure in the treatment of different types of organic solid wastes. Dealing with excess and reducing the production of organic fertilizers;

[0007] Problem 2: It is difficult to hydrolyze easily degradable organic matter in a very short period of time (for example, within two minutes) due to the thermal hydrolysis operating principle and parameters used, as well as the stabilized kettle unit operating equipment used;

[0008] Problem 3: It is difficult to achieve a balance between the thermal hydrolysis rate and the thermal oxidation rate in the high-speed stable kettle, resulting in incomplete decomposition of easily degradable organic matter;

[0009] Problem 4: It is difficult to balance the oxygen supply rate and oxygen demand rate in a high-speed stable kettle in a very short time, resulting in incomplete decomposition of easily degradable organic matter;

[0010] Question 5: If the heat released by the oxidation of easily degradable organic matter cannot be exported and collected in a short period of time, it may cause the inability to raise the temperature quickly and affect the effective recovery and reuse of energy and the progress of self-sustaining reactions;

[0011] Question 6: How to make the most effective application of the heat generated by the high-speed stabilizing kettle in the treatment plant, and how to avoid the solidification or carbonization of small organic particles in the kettle and prevent the transmission of heat energy;

[0012] Question 7: Solid-liquid separation method under high temperature and high pressure and how to avoid frequent maintenance problems;

[0013] Question 8: In order to highly oxidize and decompose easily degradable organic matter, it often causes excessive acidification and excessive residual oxygen, which affects the demand for neutralization and reduction before treatment in the activation tank, and results in a reduction in the output of organic fertilizers;

[0014] Question 9: The arrangement and efficiency of the expansion and activation of high-content or densely granular lignocellulosic materials in the treatment system

[0016] For the above problem 2, because hydrolysis and oxidation are carried out in the same stable tank, if the amount or rate of hydrolysis of easily degradable organic matter is insufficient, it will not only affect the oxidation problem of the connection, but also cause the temperature to not be raised quickly, making it difficult to effectively recover energy and form self- continuous response

[0017] For the above problem 3, due to the problem of residual easily degradable organic matter, it is impossible to completely achieve harmlessness

However, problem 5 not only involves hydrolysis and oxidation, but also is affected by the contact opportunities of reactants, reaction temperature, effective residence time, heat exchange, etc.

However, since the content of waste is extremely variable, if the above-mentioned reactions (problems 1 to 5) are added, the provision of external heat energy becomes necessary.

This causes problem 7: the micropores of the solid-liquid separator (about 200 mesh filter holes are required when treating sludge) are often blocked, resulting in frequent shutdowns for maintenance

[0023] For problem 9, it is the problem of puffing activation of high content or densely granular lignocellulosic materials (such as wood blocks or sawdust contained in garbage, or high content of compact straw in agricultural waste, etc.)

Images