Plant-based treatment method for heavy metal sewage
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A heavy metal and sewage technology, applied in the field of phytoremediation, can solve problems such as hindering the restoration of heavy metal pollution
Pending Publication Date: 2021-07-09
GUANGXI NORMAL UNIV
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Embodiment 1
[0018] A plant treatment method for heavy metal sewage, comprising the following steps:
[0019] (1) Preparation of lead-zinc ore leach solution slightly polluted by heavy metals
[0020] Weigh 10kg of heavy metal-contaminated lead-zinc ore soil samples crushed in advance and sieved through a 10-mesh sieve under a sterile environment, mix with 10L deionized water and stir for 0.5h, shake with an oscillator for 2h, and let stand for 0.5h , filter the supernatant with analytical filter paper to obtain 6L of extract solution with a water-to-soil ratio of 1:1.
[0021] (2) Add sodium silicate
[0022] Divide 6L of the extraction solution into two equal parts, one of which is added with sodium silicate to control the silicon concentration of 1mM, and each part of the extraction solution is equally divided into three culture pots.
[0023] (3) Cultivation of white crane taro
[0024] Select 6 strains of white crane lily that have been diluted and pre-cultured with nutrient soluti...
Embodiment 2
[0026] A kind of plant treatment method of heavy metal sewage, different from embodiment 1, comprises the following steps:
[0027] (1) Preparation of lead-zinc ore heavy metal heavily polluted soil sample leach solution
[0028] Weigh 10kg of heavy metal-contaminated lead-zinc ore soil samples crushed in advance and sieved with a 10-mesh sieve in a sterile environment, mix with 10L deionized water and stir for 0.5h, shake with an oscillator for 2h, and let stand for 0.5h. Filter the supernatant with analytical filter paper to obtain 6 L of extract solution with a water-to-soil ratio of 1:1.
[0029] (2) Add sodium silicate
[0030] Divide 6L of the extraction solution into two equal parts, one of which is added with sodium silicate to control the silicon concentration of 1mM, and each part of the extraction solution is equally divided into three culture pots.
[0031] (3) Cultivation of white crane taro
[0032] Select 6 strains of white crane lily that have been diluted a...
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Abstract
The invention discloses a plant-based treatment method for heavy metal sewage, which comprises the following steps of: S1, selecting a normal non-polluted soil sample, a lead zinc ore heavy metal lightly polluted soil sample and a lead zinc ore heavy metal heavily polluted soil sample, respectively extracting leaching solutions, and applying exogenous sodium silicate into the leaching solutions; S2, selecting spathiphyllum plants with good growth vigor and similar biomass; and S3, culturing the spathiphyllum with the three leaching solutions, and culturing the spathiphyllum in an environment with scattered light at a windowsill. By means of the method, the heavy metal enrichment amount of the spathiphyllum can be increased, the heavy metal content in the leaching solutions can be effectively reduced, and the spathiphyllum has high heavy metal tolerance and does not have obvious stress. Therefore, the dual purposes of purifying and beautifying the environment can be achieved by applying the spathiphyllum to repair the polluted water, and the method has wide application value.
Description
technical field [0001] The invention relates to the technical field of phytoremediation, in particular to a method for phytoremediation of heavy metal sewage. Background technique [0002] At present, due to the rapid development of modern industry in China, the discharge of heavy metal industrial wastewater is increasing day by day. During the mining, smelting and processing of heavy metals, many heavy metals such as lead, mercury, cadmium, cobalt, etc. enter the water body and cause serious heavy metal pollution. For example, heavy metals discharged with wastewater, even if the concentration is small, can accumulate in algae and sediment, be absorbed by the surface of fish and shellfish, and finally cause harm to organisms through concentration and amplification of food. [0003] There are three main types of heavy metal wastewater treatment methods: adsorption concentration separation removal method, chemical reaction removal method, and phytoremediation method. The firs...
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