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Two-Stage Treatment of Solid Waste Leachates in Aerated Lagoons and At

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Two-Stage Treatment of Solid Waste Leachates in Aerated Lagoons and At Ecology UDC 628.316:628.356 Наведено результати досліджень дво- DOI: 10.15587/1729-4061.2018.122425 стадійної технології очищення фільтра- тів звалищ твердих побутових відходів TWO-STAGE TREATMENT в аерованих лагунах та на міських кана- лізаційних очисних спорудах. Для другої OF SOLID WASTE стадії досліджено вплив кратності роз- LEACHATES IN AERATED бавлення фільтратів міськими каналіза- ційними стоками на ступінь та стабіль- LAGOONS AND AT ність очищення Ключові слова: фільтрат звалищ твер- MUNICIPAL WASTEWATER дих побутових відходів, аерована лагуна, біологічне очищення, іммобілізація біоце- TREATMENT PLANTS нозу M. Malovanyy Doctor of Technical Sciences, Professor, Head of Department* E-mail: [email protected] Приведены результаты исследований V. Zhuk двухстадийной технологии очистки филь- PhD, Associate Professor тратов свалок твердых бытовых отхо- Department of Hydraulics and Sanitary Engineering** дов в аэрированных лагунах и на городских E-mail: [email protected] канализационных очистных сооружени- ях. Для второй стадии исследовано влия- V. Sliusar PhD, Engineer* ние кратности разбавления фильтратов E-mail: [email protected] городскими канализационными стоками A. Sereda на степень и стабильность очистки Рostgraduate student* Ключевые слова: фильтрат свалок E-mail: [email protected] твердых бытовых отходов, аэрированная *Department of Ecology and Sustainable лагуна, биологическая очистка, иммоби- Environmental Management** лизация биоценоза **Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013 1. Introduction Efficiency of treatment of such leachates was studied using the Hrybovytsky (Lviv, Ukraine) MSW dump as The problem of treatment leachate of municipal solid an object of leachate study. Leachate of the Hrybovytsky waste (MSW) dumps and MSW landfills exists throughout MSW dump is formed in the garbage body as a result the periods of design, operation and planned closure of these of infiltration of atmospheric precipitation, run out of facilities. It should be noted that most of the MSW storage fa- groundwater at the sides of ravines and as a result of cilities in Ukraine are essentially dumps, not landfills. Unlike complex biochemical processes of decomposition of the the MSW dumps, MSW landfills are engineering structures. organic part of the garbage. They are equipped with a protective anti-filtering screen, The problem of depositing leachate of the Hrybovytsky leachate and biogas collection and disposal systems, a system MSW dump is complicated by the following factors: of technical and biological remediation of garbage-filled land – existence of large volumes of leachate (about 100,000 m3) lots, a system of collection and removal of conditionally clean because of its accumulation in six storage ponds for a consider- atmospheric water. In most cases, all these systems (or most of able period of time; them) are absent at Ukrainian sites of MSW collection. – necessity of to dispose of leachate in a relatively short At the stage of designing up-to-date MSW landfills, an time because of the acute need to free up the areas occupied innovative technology of treatment of leachate collected by by the leachate storage ponds. The ponds are located in the drainage systems is used. Productivity of this technology zone of leveling the land slope for the planned technical re- corresponds to the design productivity. During operation, pri- mediation of the land under the Hrybovytsky dump. orities in choosing a leachate treatment system depend on the In solving the problem of eliminating the ecological dan- history of operation and the technical state of the leachate col- ger caused by leachate of the Hrybovytsky dump, two stages lection system. The problem consists in the choice of a leach- should be distinguished: ate treatment system at the stage of closing the MSW dumps 1. Treatment of the accumulated leachate to enable real- for which the often uncontrolled leakage of filtrates has led to ization of the project of remediation of the land occupied by their significant accumulation in storage ponds. The problem the MSW dump. is especially acute for Ukraine, because of a large number of 2. Treatment of the leachate which will be formed in the the MSW dumps that require their closure for a long time. body of the MSW dump for decades after land remediation 23 © M. Malovanyy, V. Zhuk, V. Sliusar, A. Sereda, 2018 Eastern-European Journal of Enterprise Technologies ISSN 1729-3774 1/10 ( 91 ) 2018 as a result of biological processes of decomposition of the for different storage ponds of the Hrybovytsky MSW dump, organic garbage component. industrial realization of this technology is problematic in its These stages fundamentally differ in terms of volumet- realization. ric flow rate of the leachate that will come for treatment, Authors of [9] suggest a comparative assessment of various physicochemical characteristics and the stage duration. It is methods for implementation of anaerobic and aerobic technol- ineffective to envisage the same technology for realization of ogies of leachate treatment (UASB technology, ASBR tech- both stages. The reasons for this are technological (impossi- nology, MBBR technology, MBR technology, aerated lagoon). bility to provide full loading of equipment and its efficient According to this analysis, the largest (95 %) removal of COD operation) and financial (significant over-expenditure) as- from dump leachates was achieved in aerated lagoons. pects. A similar situation is observed at other MSW dumps Application of sorption technologies using natural sorbents in Ukraine which require land remediation. or sorbents prepared from vegetable raw materials can be prom- Therefore, development of an effective energy- and re- ising for treatment of leachates from heavy metals [10]. source-saving technology for treatment of leachate of MSW In our opinion, based on the above analysis, the treat- dumps and landfills is an urgent task. As a result of introduc- ment technology in an aerobic medium under the conditions tion of such technology, the danger of environment pollution of aerated lagoons [11–15] is the most promising for treat- with leachate will be decreased and the conditions for reme - ment of the Hrybovytsky dump leachate. Analysis of the diation of the land occupied by MSW dumps will be created. known information on its industrial application abroad sug- gests that this technology can be effectively applied at the first (preliminary) stage of treatment of the Hrybovytsky 2. Literature review and problem statement dump leachates. After preliminary treatment, the leach- ates can be sent to municipal wastewater treatment plants An overview of the most promising technologies recom- (WWTP) for additional purification. Before sending to the mended in Ukraine [1] and widely tested abroad was made WWTP, it is expedient to dilute the filtrates with municipal to select an optimal strategy for minimizing environmental sewage at a ratio which would ensure stable operation of the hazard of the Hrybovytsky MSW dump. city W WTP. Wide application of leachate treatment by the technolo- Authors of [11, 12] point out the prospects of application gy of reverse osmosis [2] to treat leachates of MSW landfills of aerobic methods in treatment of MSW landfill leachates. collected by drainage systems is observed worldwide. This Microbial communities present in sewage treatment systems technology ensures a high degree of treatment. The treated are well adapted to the destruction of complex organic com - leachate can be disposed in the surface water basins and pounds in a wide range of waste flows. Aerobic biocenosis the resulting concentrate (about 10−20 %) is returned to can be activated in the systems for treating MSW landfill the body of the dump. Disadvantage of this technology is leachates, and treatment with its help has a number of significant capital costs for setting in operation of the unit advantages over the anaerobic systems. These advantages and operating costs to ensure its functioning. Hence appli- include low cost of construction of sewage treatment plants, cation of this method is promising for treatment of constant flexibility of their operation, ability to quickly change treat- leachate flows from the dump body. Use of this technology to ment modes, easy start-up of the units, ease of maintenance treat large leachate volumes accumulated in storage ponds is and convenience for automation. One of the most technically unprofitable and inefficient. simple methods of aerobic treatment of the MSW landfill As early as the 1990s, there was information on the leachates is establishing the aerated lagoons equipped with prospects of electric-plasma treatment of leachate [3, 4]. The mechanical, pneumatic or jet aerators. Treatment proceeds technology was characterized as attractive both for the cost by chemical and biological oxidation. For implementation of implementation and for the quality of treatment. However, of the method of aerated lagoon on an industrial scale, it is because of its technological complexity, this technology has necessary to previously establish the necessary time of the not yet found a broad industrial application. leachate staying in the lagoon and the intensity of aeration The technologies of evaporation and drying as well as in an experimental way [12]. chemical binding of leachates require evaporation of large Work [13] shows the results of successful use of an amounts of water. As they require significant energy costs, aerated lagoon for treatment of leachates
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