A kind of montmorillonite-pyrite composite biological carrier material and its preparation method and application method

Abstract

The invention provides a montmorillonite-pyrite composite biological carrier material and its preparation method and application. The preparation method comprises the following steps: roasting pyrite in an oxygen atmosphere, adding concentrated sulfuric acid to the obtained calcined product to dissolve, then adding pyrite powder and sodium montmorillonite, so that the Na on the sodium montmorillonite + Fe in solution 2+ The ions were completely replaced, and sodium sulfide was added after solid-liquid separation, and heated in an oil bath; solid-liquid separation was performed with a magnet, and the recovered black solid was washed 3 times with absolute ethanol and dried in a vacuum oven. The montmorillonite-pyrite composite biological carrier material can make the total nitrogen removal rate of the aeration tank effluent reach 85% to 93%, and the total phosphorus removal rate reach 89% to 94%. It can be used without adding external carbon sources and additional phosphorus Under the condition of adsorbent, the effect of nitrogen and phosphorus removal in sewage biological treatment can be effectively improved, the operation cost can be saved and the chemical agents introduced in the treatment process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a montmorillonite-pyrite composite biological carrier material and a preparation method and an application method thereof. Background technique [0002] At present, with the rapid development of industry, environmental pollution is becoming more and more serious. At the same time, human beings have higher and higher requirements for their own living environment. For example, the Pollutant Discharge Standards for Urban Sewage Treatment Plants (GB18918-2002) stipulates that the primary A discharge standards for total nitrogen, ammonia nitrogen and total phosphorus are 15, 5 and 1mg / L respectively (built in 2006). Nitrogen and phosphorus contained in wastewater are the main nutrients for plants and microorganisms. When the wastewater is discharged into the receiving water body, when the concentration of nitrogen and phosphorus in the water exceeds 0.023m...

AI Technical Summary

Problems solved by technology

The traditional denitrification and phosphorus removal processes are either operated individually, or are simply superimposed processes. In actual production operation, it will bring such as adding a large amount of external carbon sources for the reduction of total nitrogen, and at the same time, for the total phosphorus of the effluent to meet the standard, investment Phosphorus adsorbents are added, resulting in a large amount of excess sludge, high operating costs, and the introduction of new chemical pollution, etc.