System and method for supercritical water oxidation treatment and resource utilization of organic sludge

Abstract

The invention relates to a system and a method for supercritical water oxidation treatment and resource utilization of organic sludge. The system for supercritical water oxidation treatment and resource utilization of the organic sludge comprises a grid, a sludge stirring and crushing machine, a sludge pressure pump, a preheater, an oxidizing agent pressure pump, a supercritical water oxidation reactor, a high-pressure hydrocyclone separator and a power generation system, wherein the grid, the sludge stirring and crushing machine, the sludge pressure pump and the preheater are sequentially connected through a delivery pipeline; an output port of the preheater is connected to an input port of the supercritical water oxidation reactor; the oxidizing agent pressure pump is connected to an oxidizing agent input port of the supercritical water oxidation reactor; a heater, a supercritical water input port of the supercritical water oxidation reactor, and the high-pressure hydrocyclone separator are arranged in the supercritical water oxidation reactor; and an output port of supercritical water of the high-pressure hydrocyclone separator is connected with an input end of the power generation system.

Description

technical field [0001] The invention relates to a system and method for supercritical water oxidation treatment and resource utilization of organic sludge. Specifically, the supercritical water oxidation method is used to treat organic sludge and convert harmful organic components into water and carbon dioxide. And a small amount of stable inorganic substances and other substances, while using waste heat to generate electricity, while achieving the goal of "reduced, stable, and harmless" sludge treatment, it also realizes comprehensive utilization of energy. Background technique [0002] With the acceleration of urbanization and the improvement of environmental protection standards, the rate and degree of sewage treatment are also increasing and deepening, and the output of sludge is also greatly increased. Organic sludge is the product of wastewater treatment (including domestic wastewater and industrial wastewater), which contains a large amount of toxic and harmful substa...

AI Technical Summary

Problems solved by technology

There are two main methods for sludge incineration: one is direct incineration of dewatered sludge, which has few process links and simple process, but consumes a lot of fuel and has high operating and transportation costs; Dewatered sludge is incinerated after drying or semi-drying treatment. Although it can make incineration relatively simple and reduce transportation costs, it requires supporting drying equipment, resulting in higher drying costs.

The incineration of sludge was once very popular, but the one-time investment is large, the operating cost is high, and the flue gas and incineration ash need to be reprocessed because the organic matter will produce dioxin and other highly toxic substances when the combustion temperature is lower than 850 ° C. Disadvantages limit its application

When the landfill method is used, the various toxic and harmful substances contained in the sludge will pollute the groundwater and the atmosphere through the erosion and leakage of rainwater. Increasingly limited and costly to transport over long distances

Sludge can be used in agriculture after being treated by composting, but direct application of pathogens and toxic and harmful substances contained in sludge to agriculture will cause secondary pollution of soil and water bodies, and there are still limitations in the case of immature related technologies sex

Images