Preparation of compost humus and method for repairing cadmium-contaminated soil by combining compost humus with plants
A technology for cadmium-contaminated soil and humus, applied in the restoration of contaminated soil, fertilizer mixtures, soil conditioning materials, etc., can solve the problems of low biomass of remediation plants, shorten the period of phytoremediation, and long remediation period. Low price, low production cost effect
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Embodiment 1
[0036] Embodiment 1: the preparation of compost humus
[0037] Weigh 90g of pig manure, sheep manure, duck manure, and straw compost that have passed through a 100-mesh sieve, place them in a 1000ml ground-mouth Erlenmeyer flask, add 900mL of extract (0.1mol / L Na 2 P 2 o 7 and 0.1mol / L NaOH (volume ratio is 1:1), shake well, place the Erlenmeyer flask on a heating magnetic stirrer, keep the temperature at 60°C and fully shake for 24h, then let it stand at room temperature for 24h, and take the supernatant. The upper layer suspension is at 2400r·min -1 After centrifugation for 5 minutes under the condition of , the supernatant was transferred to a clean 1000mL Erlenmeyer flask. Use HCl (1:1) to adjust the pH of the supernatant to 1-2, let it stand at a constant temperature of 70° C. for 2 hours, and then let it stand at room temperature for 24 hours. Collect the resulting solids, including suspensions and precipitates. At 3000r·min -1 The collected solid particles were ce...
Embodiment 2
[0038] Embodiment 2: Experiment on the impact of compost on soil heavy metals
[0039] Put the aged soil samples that have been air-dried through a 10-mesh sieve into plastic tanks, add four different composts according to 1‰ of the dry soil mass, stir evenly, and add water so that the soil moisture content is 65% of the field water holding capacity. On the 30th day of the experiment, soil samples were taken to determine the content of available cadmium.
[0040] From figure 1 It can be seen that adding different types of compost will lead to different changes in the available cadmium content. Among them, the available cadmium content in PCK, GCK and SCK has no significant difference from the CK group, while the available cadmium content in the DCK group is significantly lower. The effective cadmium content in the CK group. This shows that the compost itself has no activation effect on the available cadmium in the soil, but has a certain passivation effect. This is because ...
Embodiment 3
[0041] Example 3: Effect of different compost humus on soil available cadmium content
[0042]Put the aged soil samples that have been air-dried through a 10-mesh sieve into plastic tanks, add four different compost humus substances according to 1‰ of the dry soil mass, stir evenly, and add water so that the soil moisture content is 65% of the field water holding capacity . On the 30th day of the experiment, soil samples were taken to determine the content of available cadmium.
[0043] From figure 2 It can be seen that in PH, GH, DH and SH, the cadmium content of the highest GH group reached 3.77±0.07mg / kg, the lowest GF was 3.68±0.04mg / kg, all higher than CK’s 3.55±0.04 mg / kg, that is, four different humus can effectively activate soil cadmium, increasing the content of effective cadmium by 3.64% to 6.32%, and there is no significant difference among the four. combine figure 1 and figure 2 According to the experiment, it can be found that compost contains not only sub...
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