Method for reducing biological activity of heavy metal in sludge composting with microorganisms
A technology of biological activity and heavy metals, applied in biological sludge treatment, sewage/sludge fertilizer, preparation of organic fertilizers, etc. The effect of bioavailability
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Embodiment 1
[0022] A method for reducing the bioactivity of heavy metals in sludge compost using microorganisms
[0023] (1) The urban dewatered sludge used in the experiment comes from a large sewage treatment plant in Xuzhou, and the moisture content of the dewatered sludge is about 75% to 80%. After taking it, let it dry naturally for two or three days in a dark and ventilated place in the laboratory to reduce the moisture content.
[0024] (2) The carbon-nitrogen ratio of dewatered sludge itself is low, which cannot provide a good nutritional environment for the growth of microorganisms in the aerobic fermentation process. In the present invention, the sludge and auxiliary materials (cornmeal, wheat bran, sawdust) are uniformly mixed in a mass ratio of 1000:33:33:17, and the carbon-to-nitrogen ratio after mixing is about 20.
[0025] (3) The sludge was divided into two groups, one group was not added with exogenous bacterial agent, which was the control group, and the other group was...
Embodiment 2
[0040] On the basis of Example 1, the water temperature of the interlayer is controlled to be 20°C, and the air is ventilated. Except for sampling before fermentation (the 0th day), samples are collected during the fermentation (the 12th day, the 24th day) and after the fermentation (the 30th day) respectively. ) to freeze-dry the mud sample, grind and sieve, use the BCR method to measure the form of heavy metals, and calculate the mass fraction of the effective state, that is, bioavailability. The experimental results are listed in Table 1.
[0041] Table 1 Bioavailability of heavy metals during fermentation at 20℃
[0042]
[0043]It can be seen from the experimental data that when the temperature of the circulating water in the outer interlayer of the fermenter is controlled at 20°C, as the number of fermentation days increases, the bioavailability of zinc, nickel, copper, and cadmium in the group added with Bacillus phenylovorans first increased and then increased. dec...
Embodiment 3
[0045] On the basis of Example 1, the water temperature of the interlayer is controlled to be 30°C, and ventilation is performed. Except for sampling before fermentation (the 0th day), samples are collected during the fermentation (the 12th day, the 24th day) and after the fermentation (the 30th day) respectively. ) to freeze-dry the mud sample, grind and sieve, use the BCR method to measure the form of heavy metals, and calculate the mass fraction of the effective state, that is, bioavailability. The experimental results are listed in Table 2.
[0046] Table 2 Bioavailability of heavy metals during fermentation at 30℃
[0047]
[0048] It can be seen from the experimental data that when the temperature of the circulating water in the interlayer of the fermenter is controlled at 30°C, the bioavailability of the heavy metal cadmium in the group added with Bacillus phenylevorus is higher than that of the control group without the addition of exogenous bacterial agents, and th...
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