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Method for removing sulfur-dioxide in smoke by bamboo-carbon filler biological drip filtering tower

A biological trickling filter and sulfur dioxide technology, applied in the field of microbial desulfurization, can solve the problems of high cost of alloy fiber preparation, limited large-scale application, and non-environmental protection, achieve good economic and environmental benefits, realize resource utilization, high Effect of Sulfur Recovery

Inactive Publication Date: 2007-11-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane foam is an organic material, which is easy to cause environmental pollution and is not environmentally friendly
Alloy fibers are expensive to prepare, which limits their large-scale application as fillers

Method used

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  • Method for removing sulfur-dioxide in smoke by bamboo-carbon filler biological drip filtering tower
  • Method for removing sulfur-dioxide in smoke by bamboo-carbon filler biological drip filtering tower
  • Method for removing sulfur-dioxide in smoke by bamboo-carbon filler biological drip filtering tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The reaction system consists of a packed tower, a liquid circulation system and a gas circulation system. The test operation method adopts countercurrent operation. The nutrient solution is sprayed down from the top of the tower to the packing, flows in the packing from top to bottom, and finally enters the circulating water tank from the bottom of the tower, and then is pumped back to the top of the tower by the circulating water pump. The gas to be treated enters the biotrickling filter tower from the bottom of the tower, and is purified by contacting with the wet biofilm of Thiobacillus ferrooxidans in the packing during the rising process, and the purified gas is discharged from the top of the tower. The packing tower is a conventional biological trickling filter tower, but the packing used is pretreated bamboo charcoal. As the reaction proceeds, the SO in the circulating tank 4 2- The concentration is constantly increasing, and part of the liquid in the circulatio...

Embodiment 2

[0033] Change the dilute sulfuric acid of pH=2.0 in embodiment 1 into the dilute hydrochloric acid of pH=2.0, desulfurization bacteria adopts Leptospira ferrous oxide, other operating conditions remain unchanged, the fixed biomass is 5.606nmolP / g wet, SO 2 The removal rate was 98.3%.

Embodiment 3

[0035] (NH 4 ) 2 SO 4

[0036] Bamboo charcoal was soaked in the dilute sulfuric acid solution of pH=1.0 for 1 day, then dried, the temperature of the desulfurization process was 25°C, other operating conditions were the same as in Example 1, the fixed biomass was 5.269nmolP / g wet, and the SO 2 The removal rate was 98.0%.

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Abstract

The invention is concerned with a method to remove sulfur dioxide of gas and smoke through bio-trickling filter tower with bamboo-carbon filler. The nutrient source spray on the filling inside the tower form the top of bio-trickling filter tower and run into the filling from up to down and enter the circulation gutter on the bottom of tower, then go back to the top of tower by circulation gutter. Meanwhile the gas and smoke with sulfur dioxide enter form the bottom of tower, during the rising process, it is cleaned by the bio-film with fixed desulfuration bacteria and discharged form the top of tower. The filling is the pretreatment bamboo-carbon and it is fit for getting Ferrous Sulfate desulfuration byproduct. The bamboo-carbon owns developed holes and strong adsorption ability to form steady and high active bio-film and to remove the sulfur dioxide. It has wide application future to callback sulfur with low cost.

Description

technical field [0001] The invention relates to a microbial desulfurization method, in particular to a method for removing sulfur dioxide in coal-fired flue gas by a biological trickling filter tower with bamboo charcoal as filler and a method for recovering sulfur resources. Background technique [0002] SO from coal combustion 2 As the flue gas enters the atmosphere, it may form acid rain, which will cause great harm to the human living environment. At present, my country's energy structure is dominated by coal, accounting for 75% of primary energy, and with economic growth, there will be an upward trend in the next few years. Countries around the world began to study desulfurization technology in the 1950s, and up to now there are more than 200 desulfurization technologies. According to the different stages of the desulfurization process, it can be divided into desulfurization before combustion (such as coal washing technology, sulfur fixation technology, etc.), desulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/50
CPCY02A50/20
Inventor 郑正王艳锦彭晓成钟云聂耳李培培杨世关宋金伟李军状孟卓冯景伟赵国华李坤权
Owner NANJING UNIV
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