Research On Treatment Of Terramycin Bacterial Residues By High-Pressure Homogenization/Alkali And Enhanced Anaerobic Digestion

Antibiotic residue is a kind of special hazardous waste,for which the safe and effective disposal has always been one of the concerns of pharmaceutical enterprises.In this study,the release of organic matter in cells of terramycin bacteribal residues was promoted by high pressure homogenization and alkali decomposition.And the effects of chemical substances,such as iron,trace metal elements and oxidized reduction media,on the potential of methanogens produced by anaerobic digestion of terramycin bacteribal residues was also studied.On the basis of above,the semi-continuous anaerobic digestion test was carried out to determine the optimum process parameters and provide the technical reference for the anaerobic digestion of antibiotic residue.The main conclusions are as follows:The optimum pretreatment method of terramycin bacteribal residues was high pressure homogenization-alkali treatment,the optimum technological parameters were0.09 gNaOH·gTS^-1of alkali dosage,900 bar of high pressure homogenization pressure,3times of high pressure homogenization number,and 98%of water content of terramycin bacteribal residues.Under this condition,the suspended solid,solluted chemical oxygen demand,and the yield of methane reached 10 600 mg·L^-1,13 960 mg·L^-1and 171.83mL·gVS^-1,respectively,which were 0.74 times,9.49 times and 3.21 times that the original residues.The results of the methane-producing potential test of the terramycin bacteribal residues after the chemical material intensification pretreatment showed that the optimum amount of zero-valent iron,nickel ion and 2-ethylanthraquinone was 2 g·L^-1,3 mg·L^-11 and50 mg·L^-1,respectively.And the yield of methane were 281.33 mL·gVS^-1,242 mL·gVS^-1and 270.25 mL·gVS^-1,respectively,which were 63.73%?52.94%?57.49%higher than those without pretreatment.With the test of semi-continuous anaerobic digestion for the terramycin bacteribal residues after addition of chemicals,the results showed that the strengthening effect of zero-valent iron was the optimum.And the daily production of methane from pre-treated residues was increased by 44.23%,the optimum volume load reached 1.0 gCOD·L^-1·d^-1,and the maximum methane yield reached 267.12 mL·gVS^-1.On the other hand,the concentration of NH₄⁺-N was less than 1 076 mg·L^-1,and the removal rate of chemical oxygen demand was more than 89.79%.