Immobilized granules for treating acidic mine wastewater, and preparation and application methods thereof

Abstract

The invention relates to immobilized granules for treating acidic mine wastewater. The immobilized granules for treating acidic mine wastewater comprise the following components in percentage by weight: 20-40% of sulfate reducing bacteria sludge, 5-10% of nano iron composite granular material, 5-15% of hydrotalcite / hydrotalcite roasted product, 5-9% of polyvinyl alcohol, 0.2-1.5% of sodium alginate, 5-20% of biomass material and 4.5-59.8% of distilled water. The preparation method comprises the following steps: adding the polyvinyl alcohol and sodium alginate into the distilled water, and swelling and stirring to form a bubble-free gel; adding the nano iron composite granular material and hydrotalcite / hydrotalcite roasted product into the gel, and cooling by stirring to form a cooled gel; and adding the sulfate reducing bacteria sludge, dropwisely adding the saturated boric acid solution while stirring, and crosslinking to obtain the immobilized granules. The application method comprises the following steps: activating the immobilized granules, putting in a permeable reaction wall, and treating the acidic mine wastewater. On the premise of lowering the cost, the immobilized granules effectively remove heavy metals and anionic pollutants in the acidic mine wastewater, and have obviously higher treatment efficiency.

Description

[0001] Technical field:

[0002] The invention belongs to the technical field of water pollution control engineering, and in particular relates to an immobilized particle for treating acid mine wastewater and a preparation and use method thereof.

[0003] Background technique:

[0004] Mineral reserves play an important role in economic construction and social development, and are the resource guarantee for the implementation of my country's sustainable development strategy. However, due to the long-term development of mineral resources, the hydrogeological environment and ecological system of the mining area have been greatly damaged, leading to severe water shortage in the mining area, aggravating the water supply shortage in water-scarce areas, and affecting local economic construction and residents' lives. Acidic mine wastewater has a low pH value, which often contains copper, zinc, nickel, lead, chromium, iron, mercury, manganese and other highly toxic heavy metal ions, an...