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UDC 628.336.41
Pokhil Yu. N., Bagaev Iurii, Ivanov N. A., Ivanov A. N.
Innovation Technology of Wastewater Sludge Dewatering at Sludge Beds
Summary
The technology of highly effective dewatering of wastewater sludge at sludge beds using the principally new flocculant «Сибфлок®» on the basis of polyethylene oxide and special facilities – wells for sludge water disposal is described. This technology has been tested at more than ten Vodokanals of Russia and Kazakhstan at facilities of 150–700 000 m3/day of wastewater capacity under the different climatic conditions. Sludge dewatering using the new technology makes it possible to obtain the sludge with moisture content of 70–75% and after predrying in a summer period – with moisture content of 40–60%. The technology is unified and can be easily included practically in any flow charts. Additional equipping of sludge beds needs minimal expenses. The sludge dewatered at sludge beds using the flocculant «Сибфлок®» get the properties inherent to natural soils, lend itself well to composting and other types of processing.
Key words
dehydration , sludge , flocculant , sludge beds , filtration , moisture contents , artificial soil
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DOI 10.35776/VST.2021.09.07
UDC 628.32
Egorova Yu. A., Kichigin V. I., Nesterenko O. I., Iudin Aleksandr
Wastewater sludge treatment at the municipal wastewater treatment facilities with the purpose of its further utilization
Summary
Sludge from the municipal wastewater treatment facilities is the most massive technological waste that causes trouble for any city. Possible methods of wastewater sludge treatment at the municipal wastewater treatment facilities of the Samara Urban District with the purpose of its further utilization are considered. The reasons are indicated and documentary evidence of the incorrectness of assigning the responsibility for processing such wastes only to the water and wastewater utilities is provided. The method of landfilling dewatered wastewater sludge in a ridged landfill is considered. It has been established that the sludge processed at the wastewater treatment facilities is referred to the V class of environmental hazard. Sludge subjected to the treatment, stabilization, drying and neutralization (low hazardous sludge from grit chambers for domestic and mixed wastewater treatment; almost non-hazardous sludge from grit chambers for domestic and mixed wastewater treatment and excess sludge from biological treatment facilities mixed with raw sludge) can be used as fillers for concrete-cement mixtures and organo-mineral fertilizers or transferred for disposal to outside companies.
Key words
dehydration , sludge beds , landfill , sludge of mixed domestic and industrial wastewater , landfilling method , organo-mineral fertilizer
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UDC 628.336.71
Duambekov M. S., Ivanov A. N., Ivanova N. V.
«Organic belt around Kazakhstan cities – 2020» environmental project
Summary
The description of «Organic belt around Kazakhstan cities – 2020» environmental project that engages essentially the water industry and that is being implemented nowadays is presented. The timeliness of the project comes from the amendment of the national legislation, Article 301 of the Environmental Code of the Republic of Kazakhstan in particular (2016), that is related to the regulation of waste landfilling. The new regulatory document limits (and actually prohibits) storing dewatered wastewater sludge on landfills and prescribes to provide for its further processing with the purpose of transferring theses wastes from «hazardous organic wastes» category to recultivants, cultivation soil etc. The project envisages the use of Russian technology of wastewater sludge dewatering on sludge beds with the use of «Sibflok®» flocculant and the technology of enhanced composting of organic wastes developed by the experts of International Academy of Ecology (Astana). The implementation of this project will provide not only for reducing significantly the amount of municipal sludge transported to landfilling but also for establishing the production of soil-like substrates, soils for remediation of desertificated territories, landfills, dumps; and in case of advanced processing – for urban greening services.
Key words
composting , dehydration , flocculant , sludge beds , environmental damage , wastewater sludges , reclamation , bio-conversion , remediation of disturbed lands
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