Method for increasing waste water treating efficiency by improving activity of sulfate reducing bacteria

Abstract

The present invention belongs to the waste water treating technology utilizing sulfate reducing bacteria. Upwards flowing anaerobic composite bed bioreactor and mixed sulfate reducing bacteria are used in treating acid waste water containing Cr2O72-, CrO42-, Cu2+, Zn 2+, Mn2+ and other heavy metal ions. The present invention has high activity of sulfate reducing bacteria and high waste water treating efficiency. The present invention features that inside the reactor or waste water tank, simple substance iron is added to result in waste water pH value of 5.5-8.5, and that the biochemical reaction is performed at 25-30 deg.c. The present invention has the advantages of addition of simple substance iron, raised waste water pH value, improved bacteria living environment, high metabolic activity of the bacteria, reinforced capacity of the sulfate reducing bacteria, raised bacteria adaptability and waste water treating capacity.

Description

technical field [0001] The invention relates to a method for enhancing the activity of sulfate-reducing bacteria and improving the wastewater treatment efficiency. The invention belongs to the technology of treating wastewater by using sulfate-reducing bacteria. Background technique [0002] Acid wastewater is the most common type of industrial wastewater, which mainly comes from mines (drainage), electroplating, electrolysis, dyes and pharmaceutical industries, etc. Its main characteristics are: low pH value, high concentration of sulfate, and soluble heavy metal ions. Acidic wastewater containing heavy metals is extremely harmful to the environment, industrial and agricultural production, and human health, and must be treated. At present, the lime neutralization method and the wetland method are mainly used to treat this kind of wastewater. The lime neutralization method will produce a large amount of solid waste (gypsum and heavy metal hydroxide) during the treatment pr...

AI Technical Summary

Problems solved by technology

However, the metabolic activity of sulfate-reducing bacteria is limited by many factors, such as organic carbon source concentration, sulfate concentration, temperature, wastewater pH value, and the type and concentration of heavy metal ions. Therefore, in the actual wastewater treatment process, it may be due to Wastewater conditions (low pH, containing heavy metal ions) or operating conditions (operating at room temperature) are not suitable for the growth of bacteria, resulting in reduced or even inhibited bacterial activity, thereby reducing the efficiency of wastewater treatment