Method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud

Abstract

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.

Description

technical field [0001] The invention relates to a method for recycling waste and simultaneously removing nitrogen and phosphorus in water. Background technique [0002] In recent years, with the continuous development of my country's economy, industrial and agricultural structures have also been adjusted. While the aluminum industry continues to develop, a large amount of red mud waste is produced. It is one of the bottleneck problems restricting the sustainable development of my country's aluminum industry, and the removal of red mud waste is a major problem in my country's aluminum industry. The accumulation of red mud will cause a large amount of waste lye to seep into the nearby land, resulting in alkalization and swamping of the soil, polluting surface and underground water sources, and drinking such water sources for a long time will affect human health. Therefore, the rational disposal and resource utilization of red mud is of great significance. [0003] In my cou...

AI Technical Summary

Problems solved by technology

However, a large amount of livestock and poultry wastewater has brought a series of environmental pollution problems, and the pollution is relatively concentrated and difficult to deal with.

The direct discharge of wastewater from livestock and poultry farming will not only pollute surface water bodies and cause eutrophication, but also cause damage to groundwater and farmland ecosystems, and even endanger human health

Due to the high ammonia nitrogen situation, the biodegradability of livestock and poultry wastewater is not good