A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar compound passivator
A technology for dewatering sludge and biochar, which is used in the restoration of polluted soil and other directions
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Embodiment 1
[0026] A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar composite passivator, comprising the following steps:
[0027] The amount of the compound passivator of dewatered sludge and biochar is shown in Table 1. The compound passivator of dewatered sludge and biochar was added to the arsenic-contaminated farmland soil with an arsenic concentration of 37.95 mg / kg, and stirred evenly , cultivated for 40 days under the condition of temperature of 25±1°C and soil water content of 70% to 80%, that is, passivation for 40 days, to complete the restoration of arsenic-contaminated farmland soil.
[0028] In this example, the compound passivator of dewatered sludge and biochar is prepared by mixing dried sludge and biochar, wherein the mass ratio of dried sludge and biochar is 10:1.
[0029] In this example, the dried sludge used was prepared by the following method: drying the dewatered sludge at 60° C. for 2 days, grinding, and passing thro...
Embodiment 2
[0039] A method for repairing arsenic-contaminated farmland soil using a compound passivator of dewatered sludge and biochar. Compared with Example 1, the only difference is that the mass ratio of dried sludge and biochar in Example 2 is 2:1 .
[0040] During the cultivation process, soil samples of 1 day, 5 days, 10 days, 20 days and 40 days were collected.
[0041] A five-step continuous extraction method was used to analyze the form and content of arsenic in the soil samples of the treatment group and the control group collected at different times. The total amount of arsenic in each form was taken as the bioavailable arsenic concentration, and the results are shown in Table 1.
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