[Plant scale test of a new efficient poly-aluminum chloride]

To meet the requirement of improved water quality, the economic water treatment process could be achieved by systematic coagulant selection and optimization of coagulation process. The experimental results show that the new coagulant developed has significantly improved the water quality, with marked modification of the particle size distribution feature after sediment and improved filtration efficiency. The organic removal ability, as shown by low TOC and UV254 in the finished water, is also significantly improved and also verified by using resin absorption characterization method. The TTHMFP for the source water is 20.98 microg/L and 11.01 microg/L for the traditional process. By using the new coagulant the TTHMFP is further decreased to 6.40 microg/L. With application of the new coagulant, the treatment costs are significantly decreased with further improved and simplified treatment process.