DRINKING WATER PRODUCTION PROCESS Russian patent published in 2003 - IPC

FIELD: water supply. SUBSTANCE: initial water is consecutively subjected to different treatment operations, in[procedure filtration, sorption, UV disinfection, coagulation, flocculation, sorption, and supplementary sodium hypochlorite-assisted disinfecting. Water collected in admission tank is finely aerated and freed of free carbonic acid. Addition of reagents is controlled by water consumption counters at the contact clarifier outlet. Water to be treated comes from surface sources with 75 mg/l suspended particles at flow rate at least 200 cu.m/day, daily volume of rinsing water being 22.2 cu. m. Sorption filter is charged by activated carbon with grain size 1- 3 mm, total area of sorption filters being 1.55 sq.m. Filters are rinsed with periodicity at least 12 h using 12.5 l water daily for total amount of water under treatment within limits up to 229 cu.m a day. UV disinfection is carried out with nominal productivity 6 cu.m/h and demand for hypochlorite is specified within limits up to 173 l/month. EFFECT: increased cleaning efficiency.