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为探讨土霉素残留对猪粪堆肥过程的影响,以猪粪和锯末为原料,设置土霉素初始残留质量浓度分别为0、10、50、100、150mg/kg的5个处理,进行为期30d的好氧堆肥,研究土霉素对堆肥过程中温度、含水率、水溶性NH4+-N、水溶性NO3--N、水溶性有机碳(DOC)的变化影响。结果表明:(1)土霉素残留加速了温度的下降,不利于温度的上升。(2)土霉素初始残留质量浓度为100、150mg/kg不利于堆肥过程中水分的散失,并且会造成堆肥结束后堆体的高含水率。(3)土霉素抑制了堆肥过程中微生物对有机氮的分解及硝化细菌的硝化作用,其中150mg/kg处理的土霉素抑制作用最显著。(4)堆肥结束后,0、10、50、100、150mg/kg处理的DOC分别为3 815.65、3 461.88、3 429.28、3 231.18、2 782.09mg/kg。0mg/kg处理的DOC高于其他4个处理,且与150mg/kg处理之间差异显著,表明土霉素抑制了堆肥过程中微生物对有机碳的利用,其中150mg/kg处理的土霉素抑制作用最显著。
In order to explore the effect of oxytetracycline residues on pig manure composting process, pig manure and sawdust were used as raw materials to set up five treatments with initial residual concentrations of oxytetracycline of 0, 10, 50, 100 and 150 mg / kg, respectively 30d aerobic composting to study the effects of oxytetracycline on the changes of temperature, water content, water-soluble NH4 + -N, water-soluble NO3-N and water-soluble organic carbon (DOC) The results showed that: (1) oxytetracycline residues accelerated the temperature drop, which is not conducive to the temperature rise. (2) The initial residual oxytetracycline concentration of 100 and 150mg / kg is not conducive to the loss of water during the composting process, and will result in high moisture content of the pile after composting. (3) Oxytetracycline inhibited the microbial decomposition of organic nitrogen and the nitrification of nitrobacteria in compost process, of which oxytetracycline treatment at 150mg / kg had the most significant inhibitory effect. (4) After the compost was finished, DOCs at 0, 10, 50, 100 and 150 mg / kg were 3 815.65, 3 461.88, 3 429.28, 3 231.18 and 2 782.09 mg / kg, respectively. DOC at 0 mg / kg was higher than the other 4 treatments and significantly different from the 150 mg / kg treatment, indicating that oxytetracycline inhibited the use of organic carbon by microorganisms during compost, with 150 mg / kg of oxytetracycline being inhibited The most significant effect.