Deep Nitrogen Removal Method and Device for Low C / N Ratio Wastewater Coupled with Sulfur-Iron Autotrophic Denitrification

By inoculating sludge into hydrolysis acidification and sulfur-iron autotrophic denitrification reactors and adding specific fillers, the problems of high cost of external carbon sources and secondary pollution in low carbon-to-nitrogen ratio wastewater treatment are solved, achieving efficient deep denitrification and low-cost wastewater treatment.

CN118545836BActive Publication Date: 2026-06-30JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD
Filing Date
2024-06-20
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing deep denitrification processes for wastewater treatment plants are costly to operate and prone to causing secondary pollution. In particular, the method of adding carbon sources to wastewater with low carbon-to-nitrogen ratios not only costs a lot of money but may also cause secondary pollution to the environment.

Method used

A deep denitrification method using low C/N ratio wastewater coupled with sulfur-iron autotrophic denitrification is adopted. By inoculating sludge into a hydrolysis acidification reactor and a sulfur-iron autotrophic denitrification reactor, and adding biofilm packing, hydrolytic enzyme packing, and sulfur-iron packing, the hydrolysis acidification is used to convert the large molecular organic matter that is difficult to biodegrade into the small molecular organic matter that is easy to biodegrade. Combined with the sulfur-iron autotrophic denitrification reactor, deep denitrification is carried out.

Benefits of technology

It achieves efficient denitrification, reduces organic residue and sludge volume, lowers sludge treatment costs, reduces secondary pollution, and improves the biodegradability and denitrification efficiency of wastewater.

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Abstract

This invention provides a method and apparatus for deep nitrogen removal from low C / N ratio wastewater using a coupled sulfur-iron autotrophic denitrification process, belonging to the field of advanced wastewater treatment technology. The method includes inoculating sludge into a hydrolysis-acidification reactor and a sulfur-iron autotrophic denitrification reactor, respectively; adding biofilm packing and hydrolytic enzyme packing to the hydrolysis-acidification reactor; adding sulfur-iron packing to the sulfur-iron autotrophic denitrification reactor; pumping effluent into the hydrolysis-acidification reactor for preliminary denitrification to form a pretreated product; and sending the pretreated product from the hydrolysis-acidification process into the sulfur-iron autotrophic denitrification reactor for deep autotrophic denitrification. This coupling of the hydrolysis-acidification reactor and the sulfur-iron autotrophic denitrification reactor allows denitrifying bacteria to remove most of the nitrate nitrogen from the hydrolyzed organic matter. The sulfur-iron autotrophic denitrification process, because it does not require an external organic carbon source, has advantages such as reduced organic matter residue, less sludge production, lower sludge treatment costs, good denitrification effect, and less secondary pollution.
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