Landfill leachate membrane concentrated solution treatment process and system

Abstract

The invention discloses a landfill leachate membrane concentrated solution treatment process and system. The landfill leachate membrane concentrated solution treatment process comprises the following steps of pretreating nanofiltration and reverse osmosis concentrated solutions in the landfill leachate membrane treatment process, namely mother liquor, and removing solid wastes and other suspended particles in the mother liquor, and after pretreatment, entering the mother liquor deep concentration extraction and dehydration. The mother liquor subjected to impurity removal is pressed into a preheater and a heater through a pump, is heated to a target temperature, then enters an evaporation device from the top, and is in direct contact with gas from bottom to top for heat transfer and mass transfer. The evaporation device is connected with the condensation device, damp and hot steam distilled from the top directly enters the condensation device from the bottom and is condensed by condensed water from top to bottom to obtain condensate, and the condensate is mixed with nanofiltration clear liquid and then enters the reverse osmosis system to be treated; and the moisture-removed wet and hot gas is changed into cold gas and enters the evaporation device again to form a closed gas circulation system. The method is simple in process, high in safety coefficient, low in equipment investment, high in energy utilization rate and high in automation degree of the whole process.

Description

technical field [0001] The invention relates to a process and system for treating landfill leachate membrane concentrate, belonging to the field of landfill leachate application. Background technique [0002] With the rapid expansion of urban construction scale and the gradual improvement of people's living standards, the output of domestic waste is increasing. The reduction and harmless treatment of domestic waste has become an important problem to be solved urgently in the environmental circles of our country. The main components of landfill leachate depend not only on the landfill process of the landfill, but also on the types of waste handled by the landfill and their relative proportions, and more importantly, on the service time of the landfill, climate conditions, and garbage compaction. , the stage of the landfill site, and the collection and drainage methods of landfill leachate and other factors. Due to the influence of the above factors, landfill leachate has th...

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Problems solved by technology

However, at the operating temperature of the above technology, the enriched chloride ions in the concentrated solution will cause severe corrosion to the equipment. At the same time, the high concentration of humus and inorganic salt ions in the concentrated solution can easily lead to serious fouling of the equipment, reducing the heat transfer efficiency and Evaporation energy efficiency ratio reduces operational stability

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