Process for treating chloroform and carbon tetrachloride industrial waste water by catalytic metal reduction-flocculating settling method

Abstract

The invention provides a technics using catalyzing metal deoxidization- flocculation precipitation method to process chloroform and carbon tetrachloride industrial wastewater. It follows nether steps: collecting industrial wastewater and adjusting PH value to acidity, adding mineral sulfates as catalyst and iron or iron carbon as reducer to conduct catalytic reduction, introducing reaction mixture into flocculation clarification tank after reaction and adding alkali to neutrality or alkalescence and discharging flocculation after clarification. The technics is under normal temperature and pressure with adopting cheap and available materials, low process cost and excellent effect. It has no secondary pollution and heavy metal pollution.

Description

technical field [0001] The invention relates to water pollution control and treatment technology, in particular to a process for treating chloroform and carbon tetrachloride industrial waste water by catalytic metal reduction and flocculation precipitation. Background technique [0002] Chloroform (CHCl 3 ), carbon tetrachloride (CCl 4 ) is a solvent and raw material commonly used in industries such as chemical industry, medicine, and pesticide. Chloroform and carbon tetrachloride are important refractory organic compounds, which are extremely toxic to organisms, have stable chemical properties, and can exist stably for a long time in the natural environment, so they may cause long-term harm to the ecological environment; and because they have Highly volatile and lipid-soluble, it is easily absorbed by the skin and mucous membranes, thus causing harm to the human body. Chloroform and carbon tetrachloride are priority environmental pollutants stipulated by the US EPA, and ...

AI Technical Summary

Problems solved by technology

[0004] 1. The physical treatment method is either far from the treatment result and the emission standard, or the cost is too high to be popularized and applied

[0005] 2. Biological methods also have a certain treatment effect, especially in the laboratory, some microorganisms show strong degradation ability to chloroform and carbon tetrachloride, but in the long-term operation of wastewater biological treatment facilities, chloroform and carbon tetrachloride Carbon leads to degradation of microbial degradation performance, which prevents proper operation of treatment facilities

[0015] (1) Pd, the most effective catalyst at present, is too expensive;

[0016] (2) The preparation of binary metal or multi-metal catalysts is not yet suitable for the application of industrial wastewater treatment;

[0017] (3) The reducing agent or catalyst is a heavy metal, which is easy to cause heavy metal pollution in the process of water or wastewater treatment;

[0018] (4) The current multi-metal or heterogeneous catalytic systems are carried out at relatively high temperature or pressure, which makes the cost of water treatment higher and the facilities more complicated, making it difficult to popularize and apply

[0022] (1) Pd, the most effective catalyst at present, is too expensive;

[0023] (2) The preparation of binary metal or multi-metal catalysts is not yet suitable for the application of industrial wastewater treatment;

[0024] (3) The reducing agent or catalyst is a heavy metal, which is easy to cause heavy metal pollution in the process of water or wastewater treatment;

[0025] (4) The current multi-metal or heterogeneous catalytic systems are carried out at relatively high temperature or pressure, which makes the cost of water treatment higher and the facilities more complicated, making it difficult to popularize and apply