Use absorption method to dispose heavy metals in sludge Combination application of sludge and heavy metals

Author: Taida machine       Release time:2016-08-19
Reading guidance:There are a great amount of heavy metals contained in sludge. With proper disposal, the harmlessness and stabilization aims can be achieved. There are many ways to eliminate heavy metals, such as acidi
      There are a great amount of heavy metals contained in sludge. With proper disposal, the harmlessness and stabilization aims can be achieved. There are many ways to eliminate heavy metals, such as acidization, microwave methods, electrochemical method and absorption. After many tests and researches, some relevant conclusions have been got on using absorption methods to eliminate heavy metals in sludge. Adsorption is a method of dissolved contaminants in physical and chemical separation technology. It mainly uses solid adsorption material physical and chemical adsorption properties to remove a variety of pollutants. In recent years, foreign scholars study showed that activated carbon in adsorption of trace element effect significantly, especially as adverse effects of electrolytic zinc products, Sb, Ge, Co and other elements of better adsorption effect. American scholars through experiments pointed out that activated carbon with sulfur and chloride soaked, and the maximum adsorption efficiency of mercury can reach 95% to 98%. Another study showed that the adsorption of copper ion is an ion exchange with the carboxylic acid and pectin were the result of a combination of carboxyl may is the separation of heavy metal ion binding site of. With fixed spore bacteria and algae adsorption agent and the sludge treatment, adsorption of the more than 90% of CD, Cr, Cu, Ni, Hg, Pb, Zn, and then electrolyte such as sulfuric acid) or complex agents (EDTA) to leaching can also be removed a large number of heavy metals [40]. A synthesis of the polystyryl supported chelating fiber with Dithizone (3), 3 chelating fiber at a pH of about 6. 5 adsorption of CO (II), CD (II) up to 50%.  From Daye Mine soil screening out a heavy metal resistant bacteria ntg-01. When the adding amount of bacteria from 6.5 x 109 increased to 1.3 x 1010, red soil colloid, cinnamon soil colloid, goethite and Kaolinite on Cu2 maximum adsorption amount respectively: 62,70, 89.5104., 76.7,82.1,38.7,49.6mmol/kg. by adsorption treatment effect of heavy metal sludge is obvious, but the adsorption materials often have specificity and regeneration efficiency is not high.
      Although adsorption method has a good effect on heavy metal ion absorption, different adsorbent for heavy metal ions adsorption is selective. Low regeneration efficiency, thus increasing the cost of processing. Ammonia leaching method can better deal with the heavy metals in sewage sludge, but slow and accompanied by the smell, not easy to accept.
     After long-term tests and real projects, it is proved that for heavy metals in sludge treatment, using only a single method may not be able to achieve satisfactory results. In order to meet the increasingly stringent environmental requirements, realize the heavy metal sludge for agricultural use and the recovery of the heavy metals, should integrate several methods, combined treatment of heavy metals in sewage sludge, foster strengths and circumvent weaknesses. But should not always passively to find remedies should starting from itself, limit of heavy metal waste water, sludge discharged arbitrarily, fundamentally eliminate the harm of heavy metals in sewage sludge on the environment. Combined treatment of heavy metals in the sludge. contents of heavy metals in sludge decreased, which can help realize the sludge harmless and stabilization treatment finally. 

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