Method for degrading organic substances or ammonia nitrogen by catalyzing persulfate through sludge biochar

Abstract

The invention discloses a method for degrading organic substances or ammonia nitrogen by catalyzing persulfate through sludge biochar. The method includes the following steps that firstly, sludge is dried to obtain dried sludge, then the dried sludge is subjected to pyrolysis treatment for at least 2 h in the ammonia environment at 300-500 DEG C, and then sludge biochar is obtained after cooling; secondly, the sludge biochar and persulfate are put into sewage to degrade the organic substances or ammonia nitrogen in the sewage. By improving key preparation conditions of sludge biochar and increasing the application ratio of the sludge biochar and persulfate, under the catalytic function of the sludge biochar, persulfate can efficiently degrade the organic substances and ammonia nitrogen in sewage on the basis of catalysis and oxidization of sulfate free radicals, the problem of organic pollutant and the ammonia nitrogen pollution problem in sewage are effectively solved, and the degradation effect is good.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more specifically relates to a method for degrading organic matter or ammonia nitrogen in sewage by using sludge biochar to catalyze persulfate. The biochar is prepared from urban sludge by using sludge biochar to catalyze Sulfate degrades organic pollutants and / or ammoniacal nitrogen in sewage. Background technique [0002] "China's Sludge Treatment and Disposal Industry Status Analysis and Development Prospect Research Report (2016 Edition)" shows that the total scale of national planning and construction sludge treatment and disposal during the "Twelfth Five-Year Plan" period should reach 5.18 million tons per year, and by 2015, China The rate of harmless treatment and disposal of sludge in key cities will reach 80%, that of other cities will reach 70%, and that of key cities at the county level will reach 30%. However, according to the data in the "China City Statistical Yearbook", as of ...

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Problems solved by technology

[0007] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for sludge biochar catalyzed persulfate degradation of organic matter or ammonia nitrogen in sewage, wherein by the preparation conditions of its key sludge biochar ( Such as sludge pretreatment, pyrolysis temperature, pyrolysis environment), and the application ratio of sludge biochar and persulfate, etc., can effectively solve the problem of advanced oxidation technology based on sulfate radical compared with the existing technology. The production process of heterogeneous catalysts is complicated and the cost is high, and through the interaction between the sludge biochar and persulfate, persulfate can be efficiently based on sulfuric acid under the catalysis of the sludge biochar Root free radicals catalyze the oxidation degradation of organic matter (such as p-chlorophenol) and / or ammonia nitrogen in sewage (especially high-concentration sewage, such as landfill leachate), effectively solve the problem of organic pollutants and ammonia nitrogen pollution in sewage, and the degradation effect is good In addition, in the present invention, the method for utilizing sludge biochar to catalyze persulfate to degrade pollutants in sewage also provides a sludge treatment approach with good use for the present situation that a large amount of sludge cannot be properly disposed of. Environmental protection reuse provides an effective and harmless disposal method

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