Combined packing for enhancing nitrogen and phosphorus removal and application thereof in sewage treatment

Abstract

The invention discloses a combined packing for enhancing nitrogen and phosphorus removal and application thereof in sewage treatment. The combined packing comprises iron pyrite, sulfur and sawdust, and the iron pyrite, the sulfur and the sawdust are bonded into particles through an adhesive. The combined packing can enable different types of microorganisms to adhere and grow, thus realizing the function of strengthening nitrogen and phosphorus removal synergistically. According to the invention, the sawdust is added as a carbon source for growth of heterotrophic microorganisms, so that the defects of slow start-up and long period of pure autotrophic denitrification are overcome, the denitrification efficiency is improved, the process flow is simple, the operation is convenient, and the operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a combined filler for strengthening nitrogen and phosphorus removal and its application in sewage treatment. Background technique [0002] The secondary effluent of urban sewage generally has the problem of excessive discharge of nitrogen and phosphorus. The deep purification of nitrogen and phosphorus is the focus of attention in the field of urban sewage resource utilization. At present, the advanced treatment of nitrogen and phosphorus is mainly realized by adding carbon sources and chemical precipitation, but it not only increases the cost of sewage treatment and sludge production, but also may have the disadvantages of secondary pollution. [0003] Sulfur autotrophic denitrification is based on reduced sulfur (S 2- , S 0 , SO 3 2- , S 4 o 6 2- , S 2 o 3 2- etc.) as electron donors for autotrophic bacteria, CO 2 、HCO 3 - , CO 3 2- etc. ...

AI Technical Summary

Problems solved by technology

Heterotrophic autotrophic combined denitrification technology is of great development and research value. In the field of sewage treatment, especially for the deep removal of total nitrogen in urban secondary effluent, it has good development and application prospects. However, the current heterotrophic autotrophic combined denitrification system There are also shortcomings that cannot be ignored. For example, there is no perfect solution to the problem of high sulfate in the effluent, and the long-term stability of heterotrophic autotrophic denitrification combined with denitrification needs to be further improved.

Images