CONCENTRATED AND HIGH-CONCENTRATED SEWAGE PURIFICATION TECHNOLOGY
(patent No. 2159257; international application PCT/RU 098/00126)
(continued)
The flow chart of purification of the high-concentrated sewage produced by yeast, alcohol factories, chemical and pharmaceutical plants and characterised by BOD 5,000 - 50,000 mg/L and suspended matters of up to 5,000 mg/L, are complemented (Fig. below) by anaerobic reactors with granular (immobilised) biomass (UASB, EGSB reactors).
1 - anaerobic reactor; 2 - biogenic admixture preparing and measuring out installation; 3 - biogas; 4 - gas-holder; 5 - biocoagulator; CW1 - 1st purification stage works; CW2 - 2nd purification stage works.
The primary sewage is first driven to anaerobic reactor 1 where 70 - 80% of organic impurities are oxidised and 80-90% of suspended matters are entrapped.
Up-to-date anaerobic reactors form high-concentrated biomass of up to 30 - 50 g/L, due to which fact their capacity reaches 15 - 20 kgCOD/m3day. The resulting biogas contains 70% of methane (the yield making 0.3-0.4 m3 from 1 kg of COD) and 30% of carbon dioxide. The gas, after purification from H2S traces, can be used in boiler rooms for heat/steam generation.
Mineralised sludge is a valuable organic fertiliser. Then the sewage is treated in biocoagulator 5, CW1 and CW2. The purification effect at this stage is in BOD and suspended matters making 10-15 mg/L.
The above technology provides for power consumption reduction down to 0.1 kWt/kgBOD.
In Russia, the development and modernisation of UASB reactors is carried out by Doctor of Technical Science of Moscow State University Prof. S. Kalyuzhnyi.
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