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Degradation of Antibiotics and Passivation of Heavy Metals During Thermophilic Composting Process
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Scientia Agricultura Sinica. 2006, 39(02):
337-343 .
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【Objective】The problem that there are various antibiotic medicines and heavy metal elements in excrements of livestock and poultry have been concerned on the farm utilization extensively. The techniques for the antibiotics degradation and heavy metals passivation were studied in the experiments.【Method】As composting is a new alternative bioremediation technology for treatment of organic pollutants and heavy metals, two experiments were conducted to evaluate the effect of using thermophilic composting to break down the content of tetracyclines(TTC, OTC, CTC) and H2O extractible of heavy metals(Cu, Zn, Cr, As). 【Results】The result of TCs degradation test indicated that the degradation of TTC, OTC and CTC using P+S and C+S in all treatments was effective, but in comparision, the addition of BM bacterium for TCs degradation in treatment was more effective, and its biodegradation rate was higher than that of P+S+TCs and C+S+TCs treatment. The biodegradation rate of OTC was the lowest in all treatments, and the rate of C+S+OTC treatment was 40.23%. The order of the three TCs biodegradation rate was TTC> CTC> OTC. The air-slaked coal has a passivation effect on the heavy metal elements in excrements of livestock and poultry. The result of heavy metal passivation test showed that the effect of addition of air-slaked coal to H2O extractible content of heavy metals, such as Cu, Zn, Cr and As, were obvious, the passivation effect of ari-slaked coal treatment was better than that of control. The H2O extractible content of heavy metals of Cu, Zn, Cr and As, after composting of pig manure, reduced by 6.17%, 6.40%, 4.17% and 1.83%, respectively, meanwhile, the H2O extractible contents after composting of chicken manure reduced by 7.07%,
5.69%, 5.50% and 2.07%, respectively. 【Conclusion】With the different thermophilic composting conditions, tetracyclines antibioticses can be degraded, and the addition of foreign beneficial bacterium can reduce residues in antibiotic medicine. Thermophilic composting also can lower the effects of heavy metals on plants. Air-slaked coal has passivation function on extractible heavy metals.
