混凝-预涂膜分离一体化技术在城市污水回用中的应用

利用集成混凝与硅藻土预涂膜分离技术深度处理城市污水厂出水以作为回用水.在混凝-预涂膜分离一体化设备内同时实现混凝剂反应、絮体生长、固液分离3个过程.结果表明,对于总磷浓度为5.0 mg·L-1、COD为100 mg·L-1的城市污水厂出水,投加聚合氯化铝75mg·L-1、膨润土100 mg·L-1,初始滤速为2.26 m·h-1时,出水总磷低于0.3 mg·L-1、COD低于30 mg·L-1.滤速与过水体积之间存在联系.混凝-预涂膜分离一体化处理单元的处理效果优于混凝-微滤单元,出水水质得到了一定程度的提高,达到了高效分离的目的,具有较好的应用前景.

The application of the integrated technology of flocculation combined with precoating filtration in wastewater reuse

The integrated technology of flocculation combined with precoating filtration was utilized in advanced treating the effluent of city sewage disposal plant to a reuse standard. The results indicated that, with PAC dosage 75 mg·L-1, bentonite dosage 100 mg·L-1 and initial filtration rate 2.26 m·h-1, total phosphor and COD concentration decreased from 5.0 mg·L-1 to 0.3 mg·L-1, and from 100 mg·L-1 to 30 mg·L-1 respectively. Some relationship existed between filtration rate and filtrated water volume. Compared with the conventional flocculation reaction and separation technology, the integrated technology raised the effluent water quality, achieved high efficient separation, and it had a good application prospect in wastewater treatment.