Criteria for evaluation of the «Samarskie Kommunal’nye Sistemy»’s activities for 2012–2015 period

Summary

The data on the activities of «Samarskie Kommunal’nye Sistemy» LLC in achieving the criteria set in the municipal property – Samara water supply and wastewater disposal systems – leasing contract of March 14, 2012, for three years are quoted. The criteria include: reduction of the failure rate of the water supply system; reduction of sewer blockages; reduction of the specific power consumption in water supply; reduction of the specific power consumption in wastewater disposal; reduction of water losses. The actual data on the operation of «Samarskie Kommunal’nye Sistemy» LLC for 2012–2015 period proves conclusively that all the five criteria of the technical performance indicators set in the leasing contract have been fulfilled by the target date. The amounts of finance and measures that provided for meeting the requirements of the tender application are presented.

Key words

losses of water , breakdown rate , criteria of water supply and wastewater disposal , specific power consumption , sewer blockage

Commercial tests of OIRTA-Pd anodes: efficiency
of sodium hypochlorite production

Summary

The results of long-term commercial tests (11 months, 7,211 operating hours) of palladium-containing OIRTA-Pd anodes are presented in comparison with the non-customized OIRTA anodes. The work objective was proving experimentally the efficiency and stability of the developed anodes in the production of sodium hypochlorite by electrolysis under real-life operating conditions. The tests were conducted in a UG-25MK-1000 electrolyzer with a capacity of 1,000 kg/day as active chlorine (Aleksandrovskii water supply system, Rostov-on-Don). During the tests, the voltage, current, active chlorine concentration, and solution temperature were regularly monitored, and the current output and specific energy consumption were calculated. OIRTA-Pd anodes were found to provide for a sustainable advantage over standard OIRTA anodes throughout their entire service life, i. e., a 4.6% reduction in operating voltage, a 10.4% increase in active chlorine concentration, a 10.4% increase in current output, a 14.6% reduction in specific energy consumption, and a 7.3% reduction in solution heating. For a plant with a capacity of 1,420 t/year as active chlorine, the annual energy savings from anode replacement amount to 326.6 MWh. The stability of the developed anodes has been proved throughout the entire testing period. The test results are recommended to the use while designing new electrolysis plants and upgrading the existing ones.

Key words

sodium hypochlorite , electrolysis , energy efficiency , water disinfection , specific power consumption , corrosion resistance , OIRTA-Pd , mixed metal oxide electrodes , palladium-containing anodes , current output