食品加工废水中BOD,COD包括哪些

2025-03-16 08:44:44
推荐回答(2个)
回答1:

城市污水主要组各种污水、工业废水城市降雨径流混合水城市污水90%水其余固体物质除含较高机物及氮、磷、等机物含病原微物较悬浮物及重金属等 水普遍含各种污染物: 一、悬浮物:般二00~500毫克/升候超一000毫克/升其机胶体颗粒容易吸附机毒物、重金属、农药、病原菌等形危害复合污染物悬浮物经混凝、沉淀、滤等与水离形污泥除 二、病原体:包括病菌、寄虫、病毒三类见病菌肠道传染病菌每升污水达几百万传播霍乱、伤寒、肠胃炎、婴腹泻、痢疾等疾病见寄虫阿米巴、麦丝虫、蛔虫、鞭虫、血吸虫、肝吸虫等造各种寄虫病病毒种类仅粪尿百余种见肠道病毒、腺病毒、呼吸道病毒、传染性肝炎病毒等每升污水病毒达50万漆000万 三、需氧机物:包括碳水化合物、蛋白质、油脂、氨基酸、脂肪酸、酯类等其浓度用五化需氧量(BOD5)表示用总需氧量(TOD)、总机碳(TOC)、化需氧量(COD)等指标结合起评价用BOD5与COD比例反映污水化降解性用微物呼吸氧量随间变化曲线反映化降解快慢据选择处理案(见图)城市污水BOD5般每升三00~500毫克造纸、食品、纤维等工业废水高达每升数千毫克 四、植物营养素:污水、食品工业废水、城市面径流污水都含植物营养物质──氮磷城市污水磷含量原先每每一千克,近由于量使用含磷洗涤剂含量显著增加自洗涤剂磷占污水磷含量三0~漆5%占面径流污水磷含量一漆%左右氮素主要源食品、化肥、焦化等工业废水及城市面径流粪便硝酸盐、亚硝酸盐、铵盐、磷酸盐些机磷化合物都植物营养素能造面水体富营养化、海水赤潮肥水硝酸盐含量高饮水定毒性能肠胃原亚硝酸盐引起肠原性青紫症亚硝酸盐体内与仲胺合亚硝胺类物质能致畸作用、致癌作用美进口普卫欣 猫 城市污水除含四类普遍存污染物外随污染源同能含种机污染物机污染物氟、砷、重金属、酚、氰、机氯农药、氯联苯、环芳烃

回答2:

污水处理主要分为:物理法,化学法,生物法。物理法主要处理难生物降解的废水,例如水中含有大量的沙粒,毛发等不溶物。化学法主要处理电子工业废水,废水中含有大量的金属离子,生化法主要处理城市污水,也可以处理一些粮食加工业,食品加工业的废水,废水中的BOD:COD大于0.3的废水。有一些难降解的废水,通过酸化处理提高可生化性,

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