Harmless treatment method for contaminated soil eluate

Abstract

The invention discloses a harmless treatment method for contaminated soil eluate and relates to contaminated soil treatment methods. The method comprises the following processes: adjusting the pH value of sulfonated thiacalixarene eluting eluate of heavy metal contaminated soil to be 12 by using sodium hydroxide; adding sodium sulfide according to the mole concentration ratio of sodium sulfide / sulfonated thiacalixarene of 2: 1, stirring for 10 minutes by using a stirrer, mixing uniformly to completely dissolve sodium sulfide, then standing for 24 hours; putting the eluate in a centrifuge tube, and carrying out centrifugation for 10 minutes at the rate of 5,000 r / min, so as to obtain a supernatant; adding concentrated nitric acid into the supernatant, and adjusting the pH value to be 10, thereby recycling the eluate as an eluent for repairing the heavy metal contaminated soil. The method has the advantages that the sulfonated thiacalixarene eluting eluate of the heavy metal contaminated soil can be subjected to harmless treatment, the recycling of the sulfonated thiacalixarene eluent is realized, the soil repair cost is reduced greatly, and the operating steps are simple, convenient and easy in implementation.

Description

technical field [0001] The invention relates to a polluted soil treatment method, in particular to a harmless treatment method for polluted soil eluate. Background technique [0002] In recent years, with the continuous acceleration of industrialization and urbanization in my country, the problem of soil environmental pollution has become increasingly serious, posing a huge threat to the sustainable use of land resources and the ecological safety of agricultural products. According to the data, the soil polluted by heavy metals in my country is about 20 million hm 2 , accounting for about 1 / 6 of the total arable land, and the amount of food polluted by heavy metals is as high as millions of tons every year. Therefore, the remediation and treatment of heavy metal-contaminated soil has become an important task of ecological environment protection in my country. [0003] At present, all countries in the world attach great importance to the research on the methods of heavy met...

AI Technical Summary

Problems solved by technology

However, the compound has not entered the stage of industrialized production at present, and the repair cost is relatively high. If the heavy metals in the contaminated soil eluate can be harmlessly treated and the eluate can be recycled, the remediation cost will be greatly reduced, and the sulfur It is possible for the leaching repair technology of thiacalixarene to be practical