The processing condensate water(PCO), which comes from the ul fi ltrated liquid of four evaporation concentration and the mother liquor of three evaporation crystallization on MSG production, cannot be directly permitted beca use of the higher concentration of COD and ammonia nitrogen.
在味精清洁生产工艺中,四效蒸发浓缩谷氨酸超滤清液,以及三效浓缩等电结晶母液,所得的蒸发凝结水(简称工艺冷凝水PCO),因COD、氨氮稍高而不能直接排放。