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餐厨垃圾的综合处理工艺及应用研究
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摘要
本研究以餐厨垃圾为对象,采用高温蒸馏分离技术对餐厨垃圾进行脱油、消毒处理,将其分离为油相、固相和液相三部分。确定了废弃油脂通过脱酸、脱色后制备生物柴油的最佳工艺条件;餐厨垃圾固体成分采用黑曲霉(Aspergillusniger)、热带假丝酵母(Candida tropicalis)和枯草芽孢杆菌(Bacillus subtilis)为混合菌剂发酵生产生物蛋白饲料,以粗蛋白含量为标准,研究了接种量、混合菌剂配比、发酵时间、发酵温度、氮源种类及其加入量对微生物发酵工艺的影响,通过正交实验确定了最佳工艺条件,并在银川某畜禽养殖场进行喂养实验,验证了生物蛋白饲料对育成猪的增重效果;餐厨垃圾废液采用假单胞菌(Pseudomonas)、巨大芽孢杆菌(Bacillus megaterium)和解脂假丝酵母(Candidalipolytica)为混合菌剂发酵生产液体菌肥,根据混合菌种发酵实验,确定了混合菌剂的最佳配比、接种量、发酵时间、发酵温度、氮源种类及其加入量。
     研究结果表明,餐厨垃圾通过100℃高温蒸馏、消毒、热水喷淋后,可将其中游离油脂分离进入液相,然后经油水分离,即可将餐厨垃圾分离为油相、固相和液相三部分。废弃油脂制备生物柴油的最佳工艺为:废弃油脂在60℃反应3h脱酸、脱色后,添加适量的甲醇和NaOH,在60℃反应40min,所得生物柴油产率达85.9%;餐厨垃圾固体成分发酵生物蛋白饲料的最佳工艺为:含水量70%,黑曲霉、热带假丝酵母、枯草芽孢杆菌混合菌剂的最佳配比为2:2:1,接种量1%,添加1.5%尿素,在30℃发酵48h。喂养实验结果显示,微生物发酵生产的生物蛋白饲料对育成猪有明显的增重效果,每头猪每月平均比对照组增重6~7公斤,经济效益显著;以餐厨垃圾废液为原料,发酵生产液体菌肥的最佳发酵工艺为:假单胞菌、巨大芽孢杆菌、解脂假丝酵母混合菌剂的最佳配比为1:1:1,接入量2%,添加1%尿素,在30℃反应72h,所得液体菌肥活菌数保持在10~8个/ml。
     本研究以工业化生产为目的,不仅解决了餐厨垃圾对环境的污染,为工农业提供各类产品,同时带来巨大的社会效益和经济效益。该工艺操作简单可行,易于操作,具有广阔的应用前景。
In the experiment, the food waste was distilled and disinfected by high temperature and distillation and divided into oil、solid and liquid. After deacide,the best method of producing biodiesel by oil was confirmed. Aspergillus niger,Candida tropicalis, Bacillus subtilis were used to produce the protein feed.The effect of the ratio and inoculation of mixed strains, time and temperature of fermentation,sort and inoculation of nitrogen on content of crude protein was studied. The technology of the fermentation was confirmed through orthogonal test. The result of feeding experiment proved that fermented feed could result in increasing weight of pigs. Pseudomonas, Bacillus megaterium, Candida lipolytica were used to produce the liquid feed. The ratio and inoculation of mixed strains,time and temperature of fermentation, sort and inoculation of nitrogen were confirmed through the zymolytic experiment of mixed strains.
     The result showed that oil could be distilled and disinfected by high temperature and distillation, the food waste could be divided into oik solid and liquid; Under 60℃the oil reacted 3 hours to decolor and deacid and under 60℃reacted 40 minutes ,appending carbinol and NaOH,to produce biodiesel,the content of biodiesel reached 85.9%.The best condition of fermenting protein feed was that moisture was 70%,the ratio of Aspergillus niger,Candida tropicalis and Bacillus subtilis was 2:2:1, inoculation 1%, ureal 1.5%, temperature 30℃, cultivate time 48 hours.The result of feeding experiment showed that protein feed could not only raise pigs but also bring significant profits; The best condition of fermenting liquid feed was that the ratio of Pseudomonas, Bacillus megaterium and Candida lipolytica was 1:1:1,inoculation was 2%,ureal 1%, temperature 30℃,cultivate time 72 hours,the total number of the mixtue bacteria reached 10~8/ml.
     This experiment not only solve the the problem of environmental pollution and provide diversified manufacture,but also bring significant profits.Besides,the technique was simple and practical to oprate.
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