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UDC 628.336.429
Kriven' A. P.
Selecting the equipment for wastewater and industrial sludge dewatering
Summary
The basic process parameters when selecting dewatering equipment are as follows: capacity; water content of sludge fed for dewatering; water content of dewatered sludge; dry matter retention efficiency; suspended solids concentration in filtrate (centrate). The comparative analysis of the technologic and economic aspects of using the most popular equipment for wastewater sludge dewatering is presented. The specific features of using centrifuges, belt filter presses and screw dehydrators are considered. Screw dehydrators for wastewater sludge dewatering at small-scale treatment facilities are described.
Key words
dehydration , sludge , flocculant , centrifuge , filter-press , dry matter , screw dehydrator
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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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UDC 628.336.42
Zlatkovskii O. A.
EKOTON chamber-membrane filter presses
Summary
The wide range of chamber and membrane filter press application alongside with the design and control system improvements allow considering this type of equipment as a solution to numerous typical and special tasks of industrial slurry and wastewater filtration. At the same time the large variability of tasks necessitates designing a wide standard series of filter presses with different specifications. Individual filter press selection and manufacture suppose considering both filtration properties of particular slurry and the parameters of the operational flow scheme, mode of operation, site-specific conditions, production resource, characteristics of the related equipment, filter press place in the general layout of the filtration area.
Key words
wastewater , dehydration , capacity , filtration , moisture contents , suspension , filtering cake , chamber filter press , membrane filter press
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UDC 628.336.411
Ivanov A. N., Ivanova M. G.
Wastewater sludge dewatering with the use of «Sibfloc®» flocculant and special wells
Summary
The technology of high-efficient wastewater sludge dewatering on sludge beds with the use of brand new «Sibfloc®» flocculant made on the basis of polyethylene oxide and special slotted wells for the collection and removal of sludge water is described. The technology has been tested under various climatic conditions – from the Krasnoyarsk Area to the Krasnodar Area and introduced at the wastewater treatment facilities in Russia and Kazakhstan. The suggested technology when used on sludge beds provides for wastewater sludge dewatering to 68–75% moisture content; under the effect of «Sibfloc®» flocculant the sludge is structurized and readily dried to 40–45% moisture content after unloading from the sludge bed. The sludge generated during dewatering is suitable for any type of utilization – from direct use as soil conditioner for reclamation of dumps and solid waste landfills to processing into fertilizers and soil for forest plantation. Sludge not suitable for any utilization because of fast drying capability to any moisture content (from 60 to 8%) can be efficiently used in biogas generating plants or special furnaces either in its initial state or in the form of fuel bricks. Technical and economic performance and environmental effect of using the considered technology allow classifying it as a best available technology. Introducing the technology of wastewater sludge dewatering with the use of «Sibfloc®» flocculant provides for 4–7 times reduction of the required number of sludge beds, and improvement of sanitary and environmental situation at the treatment facilities and adjacent territories, including efficient odor control and unloading filled up sludge beds and sludge tanks.
Key words
dehydration , flocculant , wastewater sludges , treatment facilities , sludge bed , slotted well , reclamation
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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 628.336.57:628.162.52
Podkovyrov V. P., Arutyunova I. Yu., Yagunkov S. Yu., Zvyagin K. E., Dmitrieva Yu. S.
Operational Experience of a Shop of Mechanical Dewatering of Water Treatment Sludge at the Eastern Water Treatment Station
Summary
From January, 2010 the facilities for processing of water treatment sludge operate at the Eastern water treatment station of the Moscow State Unitary Enterprise Mosvodokanal (MSUE). The facilities include settling tank-sludge thickeners, drum thickeners, and centrifuges. The sludge treatment facilities operate round-the-clock. The operational experience shows that influent wastewater is characterized by significant irregularity during the day both by flow rate and by quality. In this connection there was the search for both optimal operating conditions of the facilities and optimal reagents making it possible to achieve the maximum efficiency of dewatering at preservation of acceptable quality of wastewater disposed.
Key words
dehydration , flocculant , centrifuge , sludge from water treatment plant , sludge treatment facility , drum thickener
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UDC 628.336.429:504.009
KERIN A. S., Sidorov S. M., Sokolova E. V.
The Use of the UGOS-110Installation in Technological Processes of Wastewater Sludge Treatment
Summary
Results of the study of possibility of using the UGOS-110 installation for enhancement of efficiency of excess activated sludge in the flow charts of domestic wastewater treatment are described. Non-densifying activated sludge from the secondary settling plants was treated. As a result it is established that the use of UGOS-110 equipment is the most preferred at facilities of biological treatment of domestic wastewater with output of up to 3000 m³ per day. It makes it possible to improve the level of sludge dewatering, reduce the flocculant consumption, cut equipment costs.
Key words
wastewater , biological treatment , surplus active silt , dehydration , flocculant , sludge moisture content , compaction
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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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