GreenTech Water Engineering (Beijing) Co., Ltd. won the bid for upgrading and Expansion Project of Ningxia Qingtongxia Xiaoba Water Treatment Plant in July, 2013. The water supply capacity of this plant is 20,000m³/d. Ultrafiltration (UF) pretreatment combined with Nanofiltration (NF). Softening process addresses higher hardness and sulfate concentration of the undergrourd source water. The permeate of NF blends with the outlet of UF or sand filter . GreenTech is in charge of conceptual engineering, equipment procurement, membrane system fabrication, installation and associated service for the project.