赖氨酸废水的处理和氨回收

Treatment of Lysine Wastewater and Recovery of Ammonia

对赖氨酸浓废水调 p H沉淀处理后的澄清水进行预处理 :先加入石灰乳 ,搅拌、沉淀 ,SO42 -从 2 0 0 0 0 m g/ L 左右降至 130 0 mg/ L 左右 ,去除率为 94%左右 ,然后进行空气吹脱 ,NH3- N从 5 0 0 0 mg/ L左右降至 80 m g/ L左右 ,去除率 >98%。吹脱出水经厌氧生化处理后 ,再进行空气吹脱 ,NH3- N从 70 0 mg/ L 左右降至 85 mg/ L 左右 ,去除率 >86 %。再吹脱出水与稀废水混合后进行好氧生化和 A/ O、O系统处理 ,出水的 COD<10 0 m g/ L,BOD5<2 0 mg/ L,SS<70 mg/ L,NH3- N<2 5 m g/ L。对浓废水与石灰乳混合后搅拌过程中及两次空气吹脱过程中挥发的 NH3进行回收 ,将其与 H2 SO4反应 ,生成的 (NH4) 2

After pH adjustment sedimentation, high concentration lysine wastewater is pretreated first by lime milk adding agitation sedimentation with SO 4 2- reduction from 20000 mg/L to 1300 mg/L (about 94%) and then by air stripping with NH 3 N reduction from 5000 mg/L to 80 mg/L (over 98%). The effluent from air stipping is treated by anaerobic method, second air stripping with NH 3 N reduction from 700 mg/L to about 85 mg/L (over 86%).The effluent from second air stripping is mixed with low concentration wastewater and enters into aerobic biological treatment and A/O?O system. COD, BOD 5, SS and NH 3 N of the final effluent are less than 100 mg/L, 20 mg/L, 70 mg/L and 25 mg/L respectively. The NH 3 N recovered from agitation and air stripping reacts with H 2SO 4 to produce (NH 4) 2SO 4, which is reused in the production.