膜蒸馏耦合结晶技术处理碱渣废水

提出了一种采用直接接触式膜蒸馏耦合冷却结晶技术处理碱渣废水的工艺，成功实现了废水处理装置的连续、稳定运行和废水的零排放。在不同操作条件和操作方式下，考察了物料流量、废水浓度、膜的重复使用等因素对系统中蒸馏过程和通量结果的影响。结果表明，进料温度50℃、冷侧循环水温度20℃，冷热两侧流量0.55L/min时，进行边进料边采出的零排放连续操作，稳定通量达9.0kg/(m²×h)左右。该结果证实了膜蒸馏耦合结晶技术处理碱渣废水的可行性。

The treatment of alkaline wastewater by membrane distillation coupled crystallization technology

This work is proposed to treat the alkaline wastewater with the technology of direct contact membrane distillation coupled cooling crystallization, using constructed apparatus for the experimental research. Continuous operation for the treatment is achieved successfully and it turns out to make the wastewater zero discharge into realization. We confirm the impact of factors such as the feed flow, wastewater concentration and membrane module’s reuse on distillation process and flux result under different operating conditions by investigating the operational aspect. Continuous operation without discharge is carried out producing while feeding under the condition containing inlet feed temperature 50℃，permeate side temperature 20℃，flux 0.55L/min in both sides，and the stable trans-membrane flux maintains at 9.0 kg/(m2·h) approximately. The membrane distillation coupled crystallization technology is verified to be feasible in alkaline wastewater treatment through result findings.