Method for preparing nitrogen fertilizer through ammonia-nitrogen wastewater

Abstract

The invention relates to a method for preparing nitrogen fertilizer through ammonia-nitrogen wastewater and belongs to the field of fertilizer production. The method comprises the steps that firstly, sediment particles in sludge are filtered out and removed through a filtering basin; secondly, ferric sulfate as a flocculating agent is added to the sludge, organic matter in the sludge is deposited, and the nitrogen content in the sludge is consolidated; thirdly, the sludge is washed through the ammonia-nitrogen wastewater. Ammonia and nitrogen are consolidated through azolla, anabaena and nostoc, the mmonia-nitrogen content in the ammonia-nitrogen wastewater is eliminated, the nitrogen content in the sludge is increased, and the rich nitrogen fertilizer is formed. The method is novel and unique. Examples prove that by comparing the crop land where the nitrogen fertilizer is applied with the crop land where the prepared nitrogen fertilizer is not applied two months after the prepared nitrogen fertilizer is applied to the crop land, the growth speed of plants in the crop land where the nitrogen fertilizer is applied is high, fruits of the plants are full, and the ammonia-nitrogen removal rate of the ammonia-nitrogen wastewater reaches 93% or more.

Description

technical field [0001] The invention relates to a method for preparing nitrogen fertilizer by utilizing ammonia nitrogen wastewater, belonging to the field of chemical fertilizer production. Background technique [0002] Ammonia nitrogen is a nutrient in water, which can lead to water eutrophication. It is the main oxygen-consuming pollutant in water and is poisonous to fish and some aquatic organisms. If it is used for a long time, nitrite in water will combine with protein The formation of nitrous acid, which is a carcinogen, is extremely harmful to human health, so we need to remove ammonia nitrogen in time. Now, under normal circumstances, the more practical methods for removing ammonia nitrogen in wastewater are: breakpoint chlorination method, biological method and chemical precipitation method. First, the breakpoint chlorination method is to pass chlorine gas or sodium hypochlorite into the wastewater to remove the NH in the wastewater 3 -N oxidation to N 2 The che...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: Aiming at the disadvantages that ammonia nitrogen wastewater is serious to the environment, nitrogen fertilizer also has great pollution to the environment in the process of making nitrogen fertilizer, and the use effect of nitrogen fertilizer is not good, a method of using ammonia nitrogen wastewater to prepare nitrogen fertilizer is provided. In this method, the ammonia nitrogen wastewater is washed through the river sludge to remove the particulate impurities, and then the ammonia nitrogen is fixed by Anthracia anthracnose, Anabaena and Nostoc, thereby reducing the ammonia nitrogen content in the ammonia nitrogen wastewater and increasing The content of ammonia nitrogen in the sludge forms a rich nitrogen fertilizer