A multi-stage soil column leaching system based on feedback control and its leaching experimental method

Abstract

The invention discloses a multistage soil column leaching system based on feedback control and a leaching experiment method thereof, and belongs to the field of leaching experiment equipment; an assembling type column body, a feedback control assembly and a sampling assembly are correspondingly arranged; and the two ends of a column unit are arranged as a conical table structure separately, so that the multistage column body can be quickly and reliably assembled, and the collection of a sample can be realized automatically, accurately and quickly. The multistage soil column leaching system based on feedback control is simple in structure and convenient to assemble and disassemble for washing, the leaching experiment of the multistage soil column can be effectively realized on the premise that the natural flow of a leachate in the soil can be accurately simulated, the accuracy and the automation degree of the leaching experiment are high, the assembling time and the sampling time of theleaching system can be effectively shortened, the efficiency and accuracy of the leaching experiment are greatly improved, human errors introduced in the leaching experiment process are reduced, andthe system has relatively high application prospect and popularization values.

Description

technical field [0001] The invention belongs to the field of leaching experimental equipment, and particularly relates to a multi-stage soil column leaching system based on feedback control and a leaching experiment method thereof. Background technique [0002] In recent years, the overall situation of solid waste pollution in my country has become more and more serious. These solid wastes include domestic waste, industrial solid waste and hazardous waste generated in human production and life. Solid wastes are piled up in the open for a long time, and their harmful components are often found in Under the action of leaching and infiltration of surface runoff and rainwater, it migrates to surrounding and deep water bodies and soils through soil pores, thereby causing air, water and soil pollution, and ultimately endangering human health. [0003] In order to understand the distribution law of pollutants in soil and solid waste, it is particularly important to simulate the migr...

AI Technical Summary

Problems solved by technology

[0004] At present, most soil column leaching tests need to be realized through leaching systems or leaching equipment, but the existing leaching systems often have more or less defects, for example: 1. The existing soil column uses a conduit as a spray The liquid spraying is not uniform, which intensifies the preferential flow effect of the leachate in the soil, which makes the leaching experiment unable to accurately simulate the flow state of pollutants in the soil; 2. The existing one-piece column is designed according to the specific test. The height of the column is constant, which cannot meet the needs of different experiments for different soil heights. The versatility is poor, and the column adopts a slender structure with an open upper end. After each experiment, the soil can only be poured out through the upper end, which is extremely troublesome to operate. , it is not easy to clean the residues in the column, and there is a risk of damage and damage to the column; 3. The sampling work of the existing leaching system is complicated and heavy, the degree of automation is low, the error caused by manual operation is large, and the sampling period is long and the efficiency is low. In addition, since the migration and penetration of pollutants in the leaching system is a slow process, it is often impossible to predict the time for pollutants to reach stable migration and penetration in the device in advance, so it can only be done from the beginning of the experiment. Just take samples continuously, and finally obtain useful experimental data by deleting useless data from the test results, which greatly wastes manpower and test resources, and after each sampling, most of the samples need to be filtered and other further processing to test, the process More cumbersome and has greater limitations

Images