Multi-technique coupling bio-toilet feces treatment system with subcritical hydrothermal liquidation as key point and method

Abstract

The invention discloses a multi-technique coupling bio-toilet feces treatment system with subcritical hydrothermal liquidation as a key point and a method and belongs to the technical field of chemical engineering and environment protection. The system comprises a material buffer tank, a subcritical hydrothermal liquidation unit, a drying pelletizing unit, a high-temperature anaerobic unit, a biogas utilization unit, a combined membrane process unit, a solid-liquid separation device, a struvite crystallization unit, a urea buffer tank and a gas treatment unit. By adopting the system, a subcritical hydrothermal liquidation technique is adopted as a key point, and with the combination of a high-temperature anaerobic process and biogas recycling, heat balance can be achieved; on the basis ofseparation properties of the combined membrane process unit, biosecurity of produced water for landscaping can be ensured. Feces substances are harmlessly treated and stabilized into an organic fertilizer, nitrogen and phosphorus in urea are recycled in a mode of struvite, water in excrement and urea is harmlessly treated and recycled as landscaping water, and smell is subjected to high-temperature combustion treatment, so that harmless treatment on gases, liquids and solids is achieved, and good economic benefits and economic benefits can be achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a multi-technology coupling ecological toilet excrement and urine treatment system and method with subcritical hydrothermal liquefaction as the core. Background technique [0002] my country has a large population. With the improvement of living standards, the amount of feces produced by cities is increasing. Many cities have begun to pay attention to the treatment of feces. In the past, most of the manure was transported to agricultural production and used as fertilizer. With the large-scale operation of agricultural production, the agricultural production efficiency of manure is low, coupled with the extensive use of chemical fertilizers, and the requirements of sanitation and epidemic prevention in many large cities, manure cannot be directly fertilized without being matured, so the amount of manure accepted is decreasing day ...

AI Technical Summary

Problems solved by technology

[0004] However, at present, domestic feces and urine are mostly treated with biological methods (aerobic activated sludge method, high-temperature rapid composting, etc.), and the traditional treatment technology has low harmless efficiency and long treatment cycle, which has great environmental and health risks.

[0005] Therefore, there is an urgent need for a treatment system and process that can solve the problems of low environmental acceptance rate of urban waste, incomplete harmlessness, and low efficiency of resource utilization

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