Low-cost soil repair agent doped with activated sludge and application method of low-cost soil repair agent

Abstract

The invention discloses a low-cost soil repair agent doped with activated sludge. The soil repair agent comprises the following raw materials of, by weight, 56-78 parts of red mud, 18-25 parts of zeolite, a proper amount of distilled water, 23-31 parts of humus, 2-4 parts of land plaster, a proper amount of a NaCl solution with the concentration being 1.0 mol / L, 3-8 parts of ferric chloride, 2-4 parts of ferrous sulfate, a proper amount of stronger ammonia water, 5-10 parts of the activated sludge, 0.5-2 parts of furfural acid and a proper amount of a hydrochloric acid solution with the concentration being 1 mol / L. The zeolite and magnetic iron oxide particles are combined, a magnetic zeolite composite body with an adsorption characteristic is prepared, and the secondary pollution problem due to the fact that heavy metal elements still remain in soil during conventional treatment is avoided; and then the magnetic zeolite composite body and red mud particles are cladded and subjected to pelleting treatment, the effect of controlling slow release of OH- ions is achieved, the release rate of free alkali of the red mud is decreased, and effective stabilizing and solidifying of heavy metal ions in soil are achieved advantageously.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and more specifically relates to a low-cost soil remediation agent mixed with active sludge and a preparation method thereof. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. However, heavy metal pollution in farmland soil is extremely harmful. Heavy metal pollution in soil will not only reduce crop yield and quality, but also enter the human body through the soil-plant system and the food chain, endangering human health and life safety. [0003] Red mud is the residue produced in the process of alumina production. It is rich in oxides of iron, aluminum and calcium, which can reduce the solubility and bioavailability of metals. It can continuou...

AI Technical Summary

Problems solved by technology

However, at present, when red mud is used in pollution control and ecological restoration, red mud powder is basically used directly. Due to the rapid release of free alkali, the pH of the soil rises rapidly, causing serious harm to vegetation and soil microorganisms.

[0004] Luo Huili, Huang Shengsheng, et al., in their article "Research on Red Mud Modified Granular Restoration Materials and Its In-Situ Stabilization of Lead-Zinc Contaminated Soil", used the potential gelation of alumina industrial waste residue-red mud, and drums at room temperature Red mud-phosphorus composite particles were prepared by granulation, and applied to the in-situ stabilization and remediation of lead-zinc polluted soil, although the red mud-phosphorus composite soil remediation agent prepared by this method can neutralize part of the OH of red mud - , but it is easy to cause the accumulation of phosphorus in the soil, resulting in the problem of phosphorus enrichment in surface water