Application of sludge biochar in adsorption to organic pollutants or ammonia nitrogen in sewage and preparation of sludge biochar
A technology of organic pollutants and biochar, applied in the direction of adsorption of water/sewage treatment, water/sludge/sewage treatment, pyrolysis treatment of sludge, etc., can solve the problems of low practical value, high cost, low ammonia nitrogen removal efficiency, etc. problems, to achieve the effect of increasing added value, excellent adsorption capacity, and rich surface functional groups
Inactive Publication Date: 2016-11-16
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Most domestic waste landfills choose membrane technology to intercept pollutants as the final disposal of landfill leachate (i.e., landfill leachate). The large amount of concentrated liquid produced by this method cannot be properly disposed of, and there is still a hidden danger of secondary pollution.
In addition, the advanced oxidation method based on hydroxyl radicals is another way of thinking. Although it can degrade organic pollutants in leachate to a certain extent, the removal efficiency of ammonia nitrogen is very low.
The adsorption of low-cost and high-efficiency adsorbents on pollutants, especially ammonia nitrogen, may effectively supplement the existing treatment methods for the treatment of concentrated liquid or ammonia nitrogen; while the cost of activated carbon, which is currently the most used adsorbent, is relatively higher than that of biochar, and its practical value is not good. high
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[0025] The preparation steps of sludge biochar among the present invention are as follows:
[0026] (1) drying municipal sludge with a moisture content of about 80% at 105°C for 24 hours;
[0027] (2) Put the dried sludge into the muffle furnace which was pre-evacuated and then filled with nitrogen to atmospheric pressure and kept the muffle furnace closed, and heated to 300°C, 350°C, 400°C, 450°C at a rate of 10°C / min. ℃, 500℃, and keep the temperature for 2 hours, cool naturally to 25℃ and take it out from the furnace. Exhaust gas absorption device;
[0028] (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: 46.98m 2 / g, 54.73m 2 / g, 75.34m 2 / g, 77.42m 2 / g, 80.25m 2 / g (corresponding to the pyrolysis temperatures of 300°C, 350°C, 400°C, 450°C, and 500°C...
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Abstract
The invention discloses application of sludge biochar in adsorption to organic pollutants or ammonia nitrogen in sewage and preparation of the sludge biochar. The sludge biochar is obtained by pyrolyzing dry sludge in a nitrogen environment at the temperature of 300 DEG C to 500 DEG C for at least 2 hours and applied to adsorption to the organic pollutants or ammonia nitrogen in the sewage. By improving the key sludge treatment conditions such as sludge pretreatment, the pyrolysis temperature and the pyrolysis environment in a preparation method, the sludge disposal problem is effectively solved, and meanwhile the prepared sludge biochar has a good adsorption effect on the organic matter (such as p-chlorophenol) and ammonia nitrogen in the sewage (particularly the high-concentration sewage such as landfill leachate) by controlling the usage amount of the sludge biochar.
Description
technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to the application and preparation of a sludge biochar in the adsorption of organic pollutants or ammonia nitrogen in sewage. The biochar is prepared from urban sludge and can absorb organic pollution in sewage substances and ammonia nitrogen, especially suitable for the treatment of high-concentration 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 da...
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IPC IPC(8): C02F11/10B01J20/20C02F1/28B01J20/30
CPCB01J20/02B01J20/20C02F1/283C02F11/10Y02W10/40
Inventor 陈朱琦汪佳陈朱蕾杜雨楠廖朱玮王华斌
Owner HUAZHONG UNIV OF SCI & TECH
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