Method regarding wood chips as carbon source and for removing nitrate in underground water by using solid-phase heterotrophy and sulfur autotrophic integrated denitrification

Abstract

The invention discloses a method for removing nitrate in underground water by using solid-phase heterotrophy and sulfur autotrophic integrated denitrification. A hybrid anaerobic baffled reactor (HABR) is used, wood chips and sulfur serve as reaction substrates and biofilm carriers in two-stage separating chambers of the HABR, the heterotrophic and autotrophic denitrification is integrated through a portioning structure of the HABR and a flow pushing state, wood chips serve as the carbon source and biofilm carriers in separating chambers in which wood chips are filled, the solid-phase denitrification is achieved under the cooperating action of cellulose degrading bacterium and heterotrophic denitrifying bacterium, alkalinity is provided for sequent sulfur autotrophic denitrification, and sulfur autotrophic denitrification bacterium inside a biofilm attached to sulfur particle surfaces can increase the nitrate removing load further in separating chambers in which sulfur particles are filled. A heterotrophic and autotrophic integrated denitrification process is developed, and a new method for disposing nitrate in underground water is provided.

Description

technical field [0001] The invention relates to the technical field of groundwater treatment, in particular to a method for removing nitrate in groundwater by using sawdust as a carbon source for solid-phase heterotrophy and sulfur autotrophy through integrated denitrification. Specifically, the composite anaerobic baffle reactor (HABR) is used, wood chips and sulfur are selected as the reaction substrate and biofilm carrier in the two-stage compartment of the HABR, and the solid-phase separation is realized by using the HABR grid structure and plug flow state. Integration of trophic denitrification and elemental sulfur autotrophic denitrification. Background technique [0002] Nitrate nitrogen has become a major pollutant in groundwater due to chemical fertilizers, infiltration of sewage, and pollution from garbage and feces. Excessive nitrates are likely to cause methemoglobinemia in infants. At the same time, the conversion of nitrates and nitrites into nitrosamines wil...

AI Technical Summary

Problems solved by technology

The integration of solid-phase heterotrophic and electrochemical hydrogen-producing autotrophic denitrification has limited its practical application due to cost, management and maintenance problems