A resource utilization method of straw produced after phytoremediation of soil heavy metal pollution
A phytoremediation and heavy metal technology, applied in the direction of carbon preparation/purification, application, process efficiency improvement, etc., can solve the problems of dry matter such as biological straws not being effectively treated, secondary pollution, etc.
Active Publication Date: 2020-06-05
HUNAN AGRICULTURAL UNIV
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Problems solved by technology
Tobacco, peanuts, oil sunflowers, etc. are plants that are easy to absorb and enrich heavy metals, and also contain high concentrations of potassium and other nutrients. However, after the tobacco is ripe and harvested, a large amount of straw and other biomass will be left, and the heavy metals in the tobacco straw The content is still relatively high. If it is not properly treated, it will lead to secondary pollution. Therefore, a large amount of dry matter such as biological straw obtained in the process of soil heavy metal pollution treatment cannot be effectively treated or resourced. It is the current phytoremediation technology. the bottleneck
Method used
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Embodiment 1
[0013] 1) Clean the tobacco stalks polluted by heavy metals in the phytoremediation soil in the mature stage after harvesting, and dry them in an oven at 60 degrees;
[0014] 2) Weigh the dried tobacco stalks and pulverize them with a pulverizer, weigh 10g and place them in a clean quartz boat, then place them in a tube furnace fed with high-purity nitrogen for firing, and set the temperature at 300-350°C. The time is set to 2 hours, and the absorption liquid is nitric acid of 0.1mol / L to obtain biochar;
[0015] 3) After step 2) is completed, weigh the fired biochar to measure its yield, then weigh 10g of fired biochar and put it into a clean beaker, add 300ml of clean water, and adjust its pH with nitric acid When the value is 1, stir for 3 hours to extract the heavy metals, then rinse and filter with clean water or centrifugal dehydration to wash off the residual acid in the biochar;
[0016] 4) Collect the extracted solution in step 3), and adjust the pH value to 9-11 wit...
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The invention relates to a resource utilization method for straw produced after phytoremediation of soil heavy metal pollution. The method comprises the steps: firstly, placing crushed straw in a tube furnace, firing into biochar at low temperature, then extracting heavy metals out from the biochar containing high-concentration heavy metals in an acidic solution by a principle of liquid extraction, and separating out the heavy metals from the solution after filtration by addition of an alkaline solution and precipitation reaction. The new solution method and approach are effectively provided for subsequent treatment of phytoremediation of soil heavy metal pollution, the phytoremediation technology achieves high-efficiency sustainable development, and a new approach is provided for plant reclamation.
Description
technical field [0001] The invention relates to a method for utilizing phytoremediation to effectively recycle straws containing heavy metals produced after soil heavy metal pollution, and recycle heavy metals to obtain liquid fertilizers containing high potassium. Background technique [0002] For a long time, frequent human activities have caused serious heavy metal pollution to soil, especially heavy metal pollution in farmland soil. Heavy metal pollutants cannot be chemically or biologically degraded, easily accumulate in plants, animals and humans through the food chain, and are highly toxic, posing a serious threat to the ecological environment, food safety and human health. For the control of heavy metal pollution in soil, the commonly used methods include physical methods such as leaching method, guest soil method, adsorption and fixation method, and chemical methods such as biological reduction method and complex extraction method. However, these methods are not on...
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IPC IPC(8): C05D1/00C01B32/05C22B7/00
CPCC05D1/00C22B7/007Y02P10/20
Inventor 曾清如葛一陈周细红陈梦莹
Owner HUNAN AGRICULTURAL UNIV