Abstract: Membrane separation technology has been widely applied to deeply purify aerospace wastewater recently. The whole purification is a process of multi-segment gradient filtering. Pretreatment consists of micron-scale sand filtration and ozone aeration. After oxidizing sedimentation and being cleared through ultrafiltration (UF) treatment, the water is clean and can be used for general washing purposes. Then, if it goes through reverse osmosis device (RO) to be further purified, the water can be reused for higher purposes. The conclusion shows:COD below 10mg/L, ammonia nitrogen 4.4mg/L, UDMH below 0.5mg/L. After deep purification, the pollutants were adsorbed on the surface of the membrane. The pressure difference gradually increased, water yield decreased, and the conductivity of water production increased slightly on the surface of the membrane. The mixed solution of 0.8mol/L NaOH and 0.5% 84 disinfectant is used as cleaning agent for membrane cleaning, and the best cleaning effect is obtained after soaking for 28 hours. Experimental results show that the deep purification of aerospace wastewater with membrane separation technology is feasible and yields substantial economic benefits. The technology is green and environment friendly, realizes recycling economy and can reduce environmental pollution by aerospace wastewater.

Key words: aerospace wastewater, purify, membrane fouling, ultrafiltration, reverse osmosis

摘要： 采用膜分离技术对航天废水进行深度净化，整机净化流程为多段梯度过滤，预处理为微米级砂滤及臭氧曝气，经氧化沉淀后的水再经过超滤（UF）处理，此时的出水已可回用于一般冲洗用途；随后，在反渗透（RO）装置中将UF系统的出水再进行深度净化，水质中化学需氧量（COD）、氨氮和偏二甲基肼浓度分别为：< 10mg/L、4.4mg/L和<0.5mg/L，可回用于较高用途。废水深度净化后，污染物被吸附于膜表面，RO膜出现压差不断增加、产水量减少、产水电导略微上升的现象。膜清洗选用0.8mol/L的NaOH和0.5%的84消毒液的混合液作为清洗剂，浸泡28h后清洗效果最佳。实验结果表明膜分离深度净化航天废水工艺的技术可行，经济效益可观，绿色环保，实现了循环经济，可降低航天废水对环境的污染。

关键词: 航天废水, 净化, 膜污染, 超滤, 反渗透