The Use of Bioblocks at Wastewater Treatment Facilities

Summary

Results of the laboratory study of an aeration tank operation for the purpose of technological comparison of two new modified bioblocks, BBZ-45P-14 and BBZ-65P-10, having the similar surface structure but different geometric parameters are presented. It is shown that these bioblocks can be used successfully in aeration tanks for immobilization of microorganisms of activated sludge. The tests of loading material samples have been carried out at biomass density in bioblocks of 0,3–0,36 kg/kg, at equivalent concentration of sludge in the system – 2,3 g/l. The bioblock BBZ-65P-10 is used preferably in aeration tanks, BBZ-45P-14 – in aeration tanks with low load on activated sludge, blocks of aftertreatment for additional clarification of water treated biologically and in biofilters for build-up of biological film. The comparison of results of tests on rate of activated sludge adhesion obtained with new types of bioblocks and BBZ-65 tested earlier makes it possible to conclude that the adhesion process goes off more intensively on rougher surfaces of modified models of bioblocks.

Key words

wastewater , biological treatment , biofilter , bioblock , aeration tank , secondary settling tank , adhesion , activated sludge

Wastewater treatment of a cottage estate. Design and operational errors

Summary

The principle of operation, as well as the errors while designing and operating a compact wastewater treatment plant with a design capacity of 500 m³/day (actual flow rate is 250–280 m³/day) are considered. The treatment facilities have been designed in two phases and include the stages of mechanical and biological treatment, followed by tertiary treatment in biofilters with expanded clay media, and UV disinfection of the effluent after biological treatment. Gravity sludge thickeners and dehydrators are provided for processing the resulting sludge. Upon the detailed consideration of the design solutions, as well as the problems revealed during the operation, design errors were identified that made it impossible to ensure the required quality of wastewater treatment. Currently, to enhance the operation of the complex, a number of facilities are being upgraded. This will provide for reaching the stable operation of the complex and ensuring the standard indicators at the MPC level for organic and suspended solids in the effluent before being discharged into a water body.

Key words

wastewater treatment , bioblock , domestic wastewater , compact plant , cottage estate , проблемы эксплуатации