Concentrated ammonia rectification apparatus for treating titanium dioxide industrial wastewater

Abstract

The present invention relates to a concentrated ammonia rectification apparatus for treating titanium dioxide industrial wastewater. The concentrated ammonia rectification apparatus comprises a pre-heater and a steam stripping deamination tower, wherein the steam stripping deamination tower comprises a tower kettle, the tower kettle is sequentially divided into a rectification section, a wastewater feeding section, a stripping separation section and a residual liquid separation section from top to bottom, turbogrid type trays are arranged in the tower kettle, the turbogrid type tray is provided with a plate type gas separation membrane, the bottom portion of the tower kettle is provided with a wastewater outlet, and a high temperature steam inlet is arranged on the side surface below the outer portion of the tower kettle. The apparatus of the present invention has characteristics of low cost, high ammonia nitrogen conversion efficiency, and no secondary pollution of the treated wastewater.

Description

technical field [0001] The invention relates to a rectification device, in particular to a concentrated ammonia rectification device for treating titanium dioxide industrial wastewater. Background technique [0002] Titanium dioxide (TiO2) is an inorganic pigment or catalyst that is widely used and used in a huge amount. It is a large-tonnage chemical raw material product. As a denitrification catalyst, the production of titanium dioxide is always accompanied by a large number of wastewater treatment problems. Due to the complex composition and many impurities of the wastewater and residue discharged during the production of titanium dioxide, the most important one is acid wastewater, which contains suspended solids, ammonia nitrogen, etc.; it also includes smoke, sulfur dioxide, sulfuric acid mist and solid boiler slag, fly ash, sulfuric acid Ferrous and hydrous gypsum mud, etc. In the production process, in order to achieve rational utilization of resources and discharge ...

AI Technical Summary

Problems solved by technology

However, due to the huge investment cost, complicated maintenance, high operating cost, and secondary pollution to the environment, the above method is rarely used in large-scale industrial sewage treatment projects.

The conventional ammonia nitrogen stripping process is greatly affected by the pH concentration and temperature in the water body. When the pH value in the water body is less than 11.5, the conversion efficiency of free ammonia nitrogen decreases, and it cannot achieve a good degradation effect, which has certain engineering limitations.

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