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

A persulfate and sewage degradation technology, which is applied in water/sludge/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of complex production process and high cost, and achieve simple and convenient preparation and degradation The effect is good, the method is simple and easy to implement

Active Publication Date: 2016-10-26
HUAZHONG UNIV OF SCI & TECH
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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 efficie...

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

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Embodiment

[0030] The sludge biochar production step that the present invention adopts is:

[0031] (1) drying municipal sludge with a moisture content of about 80% at 105°C for 24 hours;

[0032] (2) Put the dried sludge into the muffle furnace that was pre-vacuumized and then filled with nitrogen to the atmospheric pressure and kept the muffle furnace closed, and heated to 300, 350, 400, 450, and 500°C at a rate of 10°C / min. , and keep the temperature for 2 hours, cool naturally to 25°C and take it out from the furnace. During the firing process, evenly feed 1L / min nitrogen into the muffle furnace until the temperature in the furnace drops to 25°C and take over the exhaust to the exhaust gas absorption device;

[0033] (3) Grind the taken out biochar through a 200-mesh sieve (that is, the particle size of the sludge biochar should be finer than 200 mesh), wash it with distilled water three times and dry it at 105°C for later use. The specific surface area of ​​the fired biochar is: 46...

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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 ...

Claims

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/725
Inventor 陈朱琦汪佳陈朱蕾施乐荣朱静怡
Owner HUAZHONG UNIV OF SCI & TECH
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