Tag:sludge

№10|2013

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.098.4

Vanyushina A. Ya., DANILOVICH D. A.

Anaerobic digestion – the key technology of municipal wastewater sludge treatment (part 1)

Summary

The technologic options of municipal wastewater sludge treatment are considered with different approach to stabilization of organic matter. The technologic and environmental consequences of raw wastewater sludge landfilling are considered: emission of malodors, dewatered sludge re-thinning that entails re-dewatering are described. 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 decomposition depth. The processes of autothermal thermophilic aerobic digestion and composting that provide for the production of safe and high-quality fertilizer from sludge are considered. It is concluded that the use of these processes is economically limited to the option of land utilization of the entire sludge volume. The issues of domestic approach to digestion that consist in using thermophilic mode with extremely low retention time of sludge in a digester are considered. The largest share of small particles in sludge digested by such technology caused numerous problems with dewatering in 1960–80-ies. The ways of solving these problems at the Kur’ianovo and Liubertsy wastewater treatment facilities in Moscow including the use of advanced dewatering equipment 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, the methods of enhancing the process (thermal hydrolysis, disintegration, ultrasonic, phasing, recycling of digested sludge) are considered. The information on biogas properties is consolidated. (To be continued).

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№11|2013

WASTEWATER SLUDGE TREATMENT

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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)

Summary

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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№4|2013

WASTEWATER SLUDGE HANDLING

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UDC 628.336.3

Drozd G. Ya., Bizirka I. I.

Commercialization of landfilled sludge

Summary

The problem of municipal and industrial wastewater sludge utilization is analyzed. The option of environmental utilization of sludge by its commercialization in building and agricultural sectors is considered. To provide for the wide use of the considered approaches the following is required: full expert consideration; development of engineering specifications for every product type; introduction of amendments and supplements into the regulatory and legal framework; development of valid mechanisms of implementing sludge utilization projects; development of ways of tax exemption of profit received from the sales of waste-derived products and receiving state aids for reducing interests on bank loans.

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№5|2012

WASTEWATER SLUDGE TREATMENT

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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.

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№10|2012

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.5

Nikolaev Yu. A., Kevbrina M. V., Dorofeev A. G., Vanyushina A. Ya., Agaryov A. M.

High technology of methane digestion of wastewater sludge with biomass recycling

Summary

The technology of methane digestion of wastewater sludge with biomass recycling developed at Mosvodokanal MPUE is presented. The technology advantages ensure reducing the dry weight of sludge compared to the traditional digestion due to deeper decomposition of ash-free matter, and saving the sludge transportation, dewatering and utilization costs. Introduction of the technology at large-scale facilities will provide for eliminating the problem of hydraulic overloading.

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№4|2011

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.41

Pokhil Yu. N., Bagaev Yu. G., 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.

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№10|2012

WASTEWATER SLUDGE TREATMENT

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UDC 628.169.7:628.381

KOZLOV M. N., GRACHEV V. A., Khramenkov S. V., Shchegolkova N. M., Vanyushina A. Ya., Agaryov A. M.

The use of soils with addition of water and wastewater sludge for industrial crop cultivation

Summary

Industrial crop cultivation for biofuel production with the use of municipal solid wastes as fertilizers is a promising technique of improving energy efficiency. Comprehensive large-scale studies of technical crop sowing (false saffron, spring rape, false flax, brittle willow) were carried out on an experimental field with soil application of water and wastewater sludge. It was shown that soil application of sludges under oil-plants provided for the significant additional yield of rape, false flax and false saffron. The yield of tree crops was higher with the application of wastewater sludge; whereas technical herbage crops (false saffron, false flax, rape) showed higher yield with water sludge application. Under unfavorable weather conditions the application of sludge enhances the drought resistance of crops. When cultivating oil-plants on soils with high pollution concentration the seeds do not absorb hazardous substances; therefore no special safety measures are required when processing the plants for biofuel production.

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№4|2013

WASTEWATER SLUDGE HANDLING

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UDC 628.336.3

Kofman V. Ya.

Wastewater sludge handling in Europe(review of foreign publications)

Summary

A review of foreign literature on wastewater sludge treatment and utilization is presented. Regulatory requirements to wastewater treatment facilities operation in EC countries are given. Total characteristic of wastewater sludge is given together with sludge treatment methods (chemical stabilization, anaerobic and aerobic digestion, dewatering, thermal drying etc.), ways of utilization (storage, incineration, agricultural use, pyrolysis, gasification, wet oxidation etc.)

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№10|2013

WASTEWATER TREATMENT

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UDC 628.31.504.3.054

Rublevskaya O. N.

Measures on preventing malodors release at the facilities
of SUE «Vodokanal of St. Petersburg»

Summary

SUE «Vodokanal of St. Petersburg» has been introducing and testing different equipment for gas purification with the aim of preventing malodors release at the wastewater facilities. The experience of applying gas purification technologies at these facilities is analyzed. It was determined that the specified features of STOPKR sorption-plasma-catalytic gas purification unit and OPVS biological air oxidizing unit are efficiently used at the sewage pumping stations. The economic inexpedience of using STOPKR method at input concentrations of toxic substances higher than 1 g/m3 is a disadvantage. Testing OPVS filter in sewers showed positive results. The disadvantages of OPVS filter are in clogging of filter elements during operation as well as difficulties in processing multicomponent gas mixtures and mixtures of variable composition because of the specificity of the resulting microbial strains. The results of pilot testing TSUF-2000-400-I gas purification system showed the absence of malodors around sewer wells and convenient operation of the unit. The use of different filters including GreenKomplekt carbon filter-based units did not give any meaningful results. To control odor at the wastewater sludge landfills fine spraying of deodorant solution along the periphery of the landfill was suggested. At the sludge incineration plants exhaust gases pass three-stage purification with the use of electrostatic precipitation. At the wastewater treatment facilities the construction of either entire process flow or partially closed system was suggested. The prospects if introducing various technical and technological methods at each of the wastewater facilities are determined.

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№4|2012

OZONIA, LTD. – 15 YEARS

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UDC 628.336.44

Knoer P., Buechler M., Poisson A., Chepurnov A. V.

Low-temperature two-stage wastewater sludge drying

Summary

Practical aspects of wastewater sludge drying are considered. The new technology and INNODRY® 2E units are described that offer the following advantages: safety operation, simple and reliable mechanisms, minimization of air discharge, low polluted condensate, power efficiency owing to the built-in heat recovery system, safe dried sludge granulate produced and simple handling of granulate.

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№4|2011

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.42

Rublevskaya O. N., Krasnopeev A. L.

Experience in Introduction of Up-to-Date Technologies and Methods of Wastewater Sludge Treatment

Summary

New up-to-date technologies are needed for the solution of problems of utilization of sludge generated in the course of wastewater treatment. In St. Petersburg before the introduction of a burning technology the whole sludge preliminary dewatered at centrifuges was stored at special landfills. During the last fourteen years the whole quantity of sludge from the city’s sewerage treatment facilities is burnt. However the sludge accumulated at landfills during preceding years continues to influence negatively on environment. To eliminate this influence it was decided to process the sludge stored at landfills. With that end in view the advanced technology of sludge geotube dewatering has been chosen. Since the summer of 2009 the industrial application of this technology began at the Northern landfill.

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№3|2014

WASTEWATER TREATMENT

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UDC 628.31.504.3.054

Kaszuk Brice, LOBANOV F. I.

The main trends in the use of deodorization to control malodorous substances

Summary

Elimination of odors caused by malodorous substances at the wastewater treatment facilities is provided with the use of oxygen-containing organic substances by interaction in the air between molecules of sulfur or nitrogen compounds (with sour or fishy smell) and molecules of oxygen-containing substances. Depending upon the composition of malodorous air which contains usually up to 5–8 different compounds (hydrogen sulfide and mercapto compounds; ammonia and various amines) different combinations of aldehydes and ketones are selected. The use of various combinations of odor-blockers provides for the optimal air deodorization results. Deodorant compounds can be used only if the concentration of malodorous substances is lower than maximum permissible limits for atmospheric air. The statistic and dynamic methods of oxygen-containing organic substance molecules distribution in the air are presented. The recommendations on the use of deodorants for odor control at different public utilities (wastewater sludge mechanical dewatering facilities, pumping stations, sewers, settling tanks, ventilating systems) are given.

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№10|2012

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.71

Khramenkov S. V., Pakhomov A. N., Streltsov S. A., Kevbrina M. V., Vanyushina A. Ya., Agaryov A. M.

Improving the efficiency of wastewater sludge pretreatment by high temperature hydrolysis before digestion

Summary

The results of investigating activated sludge and primary sludge thermal pretreatment with the purpose of improving the efficiency of anaerobic digestion are presented. The highest efficiency of activated sludge organics transfer into readily soluble form is ensured after thermal hydrolysis at 160°C. The solubility of primary sludge organic matter increases evenly with the temperature increase in the range of 100–200 °С. The maximum biogas output in the ultimate digestion test is increasing after activated sludge hydrolysis at 160°С, primary sludge hydrolysis – at 180–200°С. Digestion in a continuous mode after activated sludge pretreatment at 140–160 °С results in 53% gas generation increase. Any further hydrolysis temperature increase produces a negative impact on gas generation and disintegration of activated sludge ashless matter. Thermal hydrolysis of primary sludge in thermophilic mode is not efficient. Pretreated sludge dewatering performance is improved; consequently the flocculant dosage can be reduced by 0.8–1.0 kg/t DS.

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№12|2012

POWER RESOURCES CONSERVATION

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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

Summary

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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№7|2012

WASTEWATER TREATMENT

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UDC 628.32.004.69

Sapozhnikova V. A., Steblevsky V. I., Domnin K. V., Men’kov L. L., Ioakimis G. E., Doushko A. O., Bezverhnaya O. S., Kireyev G. A., Dodousov A. A.

Developing a project of the Khabarovsk city wastewater system reconstruction

Summary

The main aspects of the Khabarovsk wastewater system reconstruction project are highlighted. The project includes the following tasks: reconstruction of the Main pumping station on the supply and pressure sewers; improvement of the wastewater treatment capacity; construction of sludge composting facilities; upgrade of the digesters and biogas utilization at a power mini-plant; sludge landfill engineering; development of tertiary treatment, disinfection and oxygenation facilities; off-site utilities engineering – gas, fiber optic line, cold water supply, power lines; gas facilities engineering in the treatment facilities area.

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№1|2017

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.71

Rublevskaya O. N., Probirsky M. D.

Reconstruction of the sludge incineration plant at the Central wastewater treatment facilities in St. Petersburg

Summary

The need for the reconstruction of the wastewater sludge incineration plant at the Central wastewater treatment facilities of St. Petersburg is substantiated. A short description of the technological processes of sludge incineration, flue gas purification and treatment of wash water generated in the process of gas purification is given. The advanced technologies of sludge pretreatment before incineration, flue gas purification, heat utilization, electric energy generation are presented. The results of the biochemical, toxicity, chemical and radiological studies carried out in SUE «Vodokanal of St. Petersburg» showed the possibility of using wastewater sludge incineration ash in the production of constructional materials. Cementing properties of ash that improve the structure and quality of constructional materials were determined. The use of ash in the production of concrete and bitumen concrete in amount of 10–12% of the concrete weight is also promising. The use of ash will improve the concrete strength by increasing the imporosity of the poured concrete, bitumen concrete. Solving the task of ash beneficial use will become a concluding stage in the package of measures on wastewater sludge utilization and will provide for zero waste process of wastewater treatment.

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№7|2010

PROBLEMS, PERSPECTIVES

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UDC 628.33.004.6

Serebryakov D. V., Tuomikoski P.

Reconstruction of Typical Radial Settling Tanks with the Use of a Scraper System Finnchain

Summary

Difficulties of the operation of radial primary and secondary settling tanks with typical equipment for sludge removal (sludge disposal trucks IBR and sludge scrapers IPR) are stated. The scraper system Finnchain (Finland) devoids these shortcomings. A principle of operation of this equipment is described; basic operation data and its distinctions from analogues are presented.

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№7|2014

WASTE MANAGEMENT

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UDC 504.064.47:628.385

Perel'shtein G. B., Svetlichnyi D. A., Dygan M. M., Mal'tseva S. S.

Advanced technologies of municipal waste management

Summary

The living activity of a modern city is accompanied by the generation of big waste amounts. In the current situation an important task of the municipal utilities is providing for the environmentally safe and energy efficient waste management. Most commonly used advanced technologies of municipal waste management – solid wastes and wastewater sludge – are presented. The options of implementing the mentioned technologies are considered; the information on the implemented projects of new generation facilities for solid waste and wastewater sludge processing and utilization designed by «MosvodokanalNIIproject» OJSC is given. Minimization of the negative impact of waste disposal on the environmental and public health is provided only by waste landfilling with the use of eco-technologies and environmental protection facilities. Thermal solid waste and wastewater sludge processing (incineration) at special boiler plants with generation of heat and electricity is an optimal option of waste disposal for the municipal utilities since it provides for the simultaneous utilization of solid by-products of incineration. On the basis of the long experience of «MosvodokanalNIIproject» OJSC in the field of designing and commissioning the facilities for waste collection, processing and utilization it is shown that environmentally sound utilization can be ensured only by using advanced waste treatment technologies that provide for environmentally safe storage, processing and disposal; reducing waste amount subject to landfilling; increasing the amount of recyclable materials and waste energy use.

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№03|2015

WASTEWATER SLUDGE TREATMENT

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UDC 628.336.44

Guliaeva I. S., D'iakov M. S., Glushankova I. S.

Thermal treatment of municipal wastewater sludge containing heavy metals

Summary

In the process of municipal wastewater sludge incineration ash is generated that contains concentrations of heavy metals which limits its further practical use and requires land filling on industrial waste dumps. The carried out research was aiming at the development of detoxification of wastewater sludge in the process of thermal destruction with the production of a product of useful quality. In the course of studies the samples of dewatered wastewater sludge from the Perm municipal treatment facilities were used. The wastewater treatment facilities receive domestic wastewater and industrial effluents from machinery works that provide for the increased concentration of heavy metals both in wastewater and in sludge. During thermochemical processing of the Perm municipal wastewater sludge wastes from potash fertilizer production (flotation potash chloride, sodium chloride) can be used as an agent that provides for utilizing heavytonnage wastes and reducing the costs of wastewater sludge utilization. It was stated that wastewater sludge pretreatment with concentrated potassium chloride or calcium chloride solutions with the subsequent incineration at 900–1000 °C provided for heavy metals transfer to gaseous phase in the form of metal chloride aerosols that were further absorbed by alkaline agent solution. The generated mineral residue contains 5–7% phosphorus (as Р2О5) in the form of calcium phosphate or potassium phosphate and trace elements that allow using it as a compound fertilizer.

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№06|2015

WASTEWATER SLUDGE TREATMENT

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UDC 628.355

Chauzy Julien, Gabriel Ian, К. Вун, Poussade Yvan, Li Edmond, Bernard Jean-Francois

Sustainable biosolids management: a review of best available technologies for sludge stabilisation and volume reduction

Summary

Australian water utilities face a significant challenge in moving towards more sustainable biosolids management. There is increa­sing pressure to move away from the traditional approach of land application of dewatered biosolids due to escalating transport costs, community impacts such as odour and truck movements, and the risk of changing regulation or public perception affecting the future viability of land application. Different sludge treatments have been compared regarding performances, opex and carbon foot print for 2 case studies: Australian Inland and Coastal WWTP. Results have shown that thermal sludge treatments, especially Wet Air Oxidation which is now a proven technology, are highly competitive compared to conventional sludge treatments particularly when sludge disposal costs are high.

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Российская ассоциация водоснабжения и водоотведения

Конференция итог

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