Dow UF is sole pretreatment for Chinese cogen plant

China’s ShanXi DaTong Co-gen has selected Dow ultrafiltration (UF) membranes for its 300MW heat/electricity cogeneration plant in DaTong in ShanXi province.

Despite challenges posed by high chemical oxygen demand, the site was able to maintain acceptable feed water quality for reverse osmosis using only a prescreen and UF modules as pretreatment. No coagulation, sedimentation, or sand filtration pretreatment unit operations were needed.

The UF membranes had product water with turbidity averaging 0.05 NTU and silt density index of <1.