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UDC 628.336.098.4

DANILOVICH D. A., Vanyushina A. Ya.

Anaerobic digestion – the key technology of municipal wastewater sludge treatment (part 2)


The technologic options of municipal wastewater sludge treatment are reviewed with different approaches to stabilization of organic matter. The technologic and environmental consequences of raw wastewater sludge landfilling are described. Aerobic sludge stabilization processes are considered. It is concluded that their use is restricted to the options when land utilization of the entire sludge volume is possible. It is shown that traditional aerobic stabilization that was widely used last century does not meet the present day requirements both to power consumption and organics decomposition depth. The aspects of the domestic approach to digestion that consist in using thermophilic mode with extremely low retention time of sludge in a digester are considered. The ways of solving these problems at the Kouryanovo and Lyubertsy wastewater treatment facilities in Moscow are described. It is concluded that in the XXI century anaerobic digestion of wastewater sludge in digesters does not have any other comparable alternative for large and mid-sized wastewater treatment facilities. The main trends in using digestion process, digester design, methods of enhancing the process are considered. The information on biogas properties is consolidated and various options of its utilization are reviewed. Process flow schemes with the use of digesting and combining with other sludge treatment processes (drying, incineration), methods of digested sludge utilization are considered. The information on environmental aspects of digestion – reducing greenhouse gas emissions and carbon footprint – is given. The technologies of purification of return flows of digested sludge dewatering are described. The advanced sludge treatment flow scheme based on digestion and recommended for large-scale facilities is given.

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UDC 628.32.004.69

Bagaev Yu. G., Veshkurtsev V. M., Gundyreva T. M., Khutornyuk G. N.

Modernization of Sewerage Treatment Facilities


The basic technical decisions and a description of the new equipment introduced at sewerage treatment facilities of the city of Novosibirsk are presented. It is told about the methods used when repairing pipelines and capacitive facilities. Modernization is carried out at all stages of treatment: at the main pumping station, mechanical and biological treatment facilities, sludge treatment facilities. Measures carried out make it possible to improve the quality of wastewater treatment, to reduce the discharge of polluting substances into the Ob. Modernization of the operating treatment facilities owing to the use of up-to-date equipment made it possible to improve the reliability of operation of the complex as a whole, to reduce the volume of sludge intended to further utilization, to reduce the negative influence on the environment and improve the city ecology.

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UDC 628.336.515

KOZLOV M. N., Kevbrina M. V., Kolbasov G. A., Agaryov A. M., Shashkina P. S.

The key results of the full-scale studies of sludge digestion technology with biomass recycle


For a number of years the specialists of R&D Centre of «Mosvodokanal» JSC have been developing and testing in a lab environment the technologies that can enhance the process of wastewater sludge digestion within the existing capacity of the treatment facilities. As a result a method was chosen which provided for thickening a part of sludge with subsequent thickened sludge returning back into the digester. The important advantage of this method is the possibility of increasing sludge retention time as dry matter without increasing the hydraulic retention time with simultaneous biomass retaining. Therefore, the required decomposition rate is provided in smaller size reactors. In the course of studying the process solutions on wastewater sludge digestion optimization the method of biomass recycle showed itself as the most economically viable. During the full-scale studies of the recycle option the decomposition of the ash-free basis increased in average to 56.6% (42.2% reference value) which was confirmed by the significant improvement of sludge dewatering properties. The average biogas yield increased by 3%. In the course of the experimental studies no adverse effects of the sludge recycling technology on the digester performance were observed. The results obtained during the full-scale studies evidence the long-term benefits of introducing the technology of wastewater sludge digestion with biomass recycle at the Moscow wastewater treatment facilities.

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UDC 628.336.5.004.18

Rublevskaya O. N., Melnik E. A.

Tackling the problem of energy saving in the Saint-Petersburg wastewater system


The technologies of primary and secondary sludge treatment at the Saint-Petersburg wastewater treatment facilities are considered. The technologies of thermal hydrolysis and thermophilic and mesophilic digestion were suggested by European companies PWT (Germany), Veolia (OTV, France) and Cambi (Norway). Implementing the project of using the energy potential of wastewater sludge will allow Saint-Petersburg Vodokanal PUE to gain unique experience of systematic approach to the solution of sludge utilization problem.

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Российская ассоциация водоснабжения и водоотведения

Конференция итог

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