scholarly journals Pilot-scale models of treatment of landfill leachates combined with urban wastewaters in a facultative lagoon

2007 ◽  
pp. 35-49
Author(s):  
Ma. Teresa Orta-de- Velasquez ◽  
Ma. Neftali Rojas-Valencia ◽  
Ignacio Monje-Ramirez ◽  
Isaura Yanez Noguez
Keyword(s):  
Biological Treatment ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Agricultural Irrigation ◽  
Landfill Leachates ◽  
Leachate Treatment ◽  
Scale Models ◽  
Treatment And Disposal ◽  
Maximum Removal ◽  
Raw Wastewater

This study set out to determ ine the potential for treating leachates in combination withwastewater at Facultative Lagoons, a device normally used for treating raw wastewaters.Pi lot-scale models were used to simulate leachate treatment and disposal in a FacultativeLagoon (FL), combining 2.4 L/hr of raw wastewater with a leachate m ixture (comprising bothyoung and old leachates), in concentrations of 4%, 6%, and 1 0% (v/v). The solution ofleachate mixture in raw wastewater was then fed into the two pilot-scale models (MI andM2). The fol lowing parameters : concentration of algae; chlorophyll a, b and c; faecalcoliforms (FC); and heavy metals, were analyzed in all the three component stages: theunmixed wastewater; the old and young leachate mixture; and the combined wastewaterleachate mixture.As a 1 0% di lution was found not to impede correct functioning of the Model FacultativeLagoon, the same concentration was tried out using urban wastewaters from the UniversityWastewater Treatment Plant (UWTP).Interval values of BODs and COD in the wastewater and in the leachate mixture were 45-875mg/L and 307-5,763 mg/L respectively, and results showed that a I 0% concentration ofleachates combined with wastewater does not upset the system of biological treatment. Noneof the m ixtures affected the population of algae. Maximum removal efficiency of BOD5 was75%, and 35% for COD, therefore leav ing a BOD5 level of less than 25 mg/L in the efflouentfrom the FL. The removal of BOD5 and COD from the U WTP was greater still, 86% and64%, respectively. FC and heavy metal concentrationso: As (0.007 mg/L), Cd (0.02 mg/L), Cu(<0.0 l mg/L), Cr ( 0.04 mg/L), Hg (o<0.00027 mg/L), Ni ( 0.15 mg/L), Pb (0.098 mg/L), CN(0.02 13 mg/L) and Zn (0.05 mg/L), were all below the maximums establ ished by the MexicanFederal Regulation for Re-use of Wastewater in Agricultural Irrigation (NOM-ECOL-00 1 -1 996).

Supercritical Water Oxidation – Wastewaters and Sludges

1991 ◽  
Vol 23 (1-3) ◽  
pp. 389-398 ◽  
Author(s):  
Abdullah Shanableh ◽  
Earnest F. Gloyna
Keyword(s):  
Acetic Acid ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Transformation Products ◽  
Pilot Scale ◽  
Supercritical Water Oxidation ◽  
Temperature And Pressure ◽  
Dimethyl Phenol

Environmental contaminants can be eliminated through the use of SCWO techniques. A comprehensive supercritical oxidation (SCWO) research laboratory, including bench and pilot-scale facilities has been developed. High temperature and pressure systems slightly less than and greater than supercritical water conditions can be used for the efficient destruction of waste biological treatment plant sludges, acetic acid, 2-nitro phenol, 2,4-dimethyl phenol, phenol, and 2,4-dinitro toluene. Above 400 °C, near complete destruction of sludge and transformation compounds such as acetic acid can be achieved with relatively short residence times. Ammonia and acetic acid are transformation products in the SCWO of biological treatment plant sludges. Acetic acid produced from the oxidation of sludge is oxidized rapidly at supercritical temperatures, 400 °C to 450 °C.

scholarly journals Biological treatment of landfill leachate: efford landfill, Hampshire, UK - a case study

2019 ◽  
pp. 377-387
Author(s):  
Steve Last ◽  
Jonty Olufsen ◽  
Howard Robinson
Keyword(s):  
United Kingdom ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Treatment Technique ◽  
Leachate Treatment ◽  
Best Available Techniques ◽  
The United Kingdom ◽  
N Removal

Demand for of on-site treatment schemes that are capable of treating landfill leachates to highstandards has grown substantially during the last two decades. Increasingly, plants are beingrequired to discharge high quality effluents directly into surface watercourses, or to provide ahigh degree of treatment prior to discharge into the public sewerage system. This trend is certainto continue - primarily driven in the United Kingdom in recent months by the requirements of theEU IPPC Directive, which demands the application of Best Available Techniques (BAT), and bythe EU Water Framework Directive.Aerobic biological treatment of leachate from domestic landfills has widely been shown to be themost appropriate, reliable and successful treatment technique to consistently meet stringentdischarge constraints with minimal operator input. The cost of this technology is also oftenfavourable, when compared with alternative processes. More than 50 plants of this type arecurrently operational in the United Kingdom, making it by far the most widely adopted on-sitetreatment technology, and many other examples exist overseas.This paper provides a detailed case study of the design, construction and commissioning of abiological, Sequencing Batch Reactor (SBR) leachate treatment plant for Hampshire CountyCouncil, at Efford Landfill Site in the New Forest in Hampshire, UK.Since plant commissioning was completed by the authors during early 2003, extensive anddetailed monitoring data have been collected. These are presented for the plant, which is capable 3 of treating up to 150 m /day of strong methanogenic leachate (ammoniacal-N from 600-1 000mg/1), and are compared with treatment performances achieved at other full-scale leachatetreatment plants. The paper shows 80D5 and ammoniacal-N removal efficiencies in excess of99%.Results also show the efficiency of polishing treatment in a reed bed, before discharge of finaleffluent to public sewer.

scholarly journals Treatment of Landfill Leachate at a Remote Closed Landfill Site on the Isle of Wight

Detritus ◽  
2020 ◽  
pp. 182-199
Author(s):  
Robinson Tim
Keyword(s):  
Large Scale ◽  
Treatment Plant ◽  
Leachate Treatment ◽  
Isle Of Wight ◽  
Daily Data ◽  
Landfill Sites ◽  
Treatment Data ◽  
Environment Agency ◽  
Treatment And Disposal ◽  
Closed Landfill

Safe treatment and disposal of leachates is an important issue at many old landfill sites, where the ingress of rainfall or groundwater is a significant issue requiring consideration. Such leachates may typically be relatively weak, but flows are often characterised by large seasonal variations, in response to winter rainfall. This paper compiles and presents long-term data from a case study on the Isle of Wight, UK. This paper highlights how a successful treatability trial using representative leachates can help predict the effectiveness of a large-scale treatment plant when treating landfill leachates biologically. Bleakdown leachate treatment plant effectively removes all concentrations of ammoniacal-N within the weak leachate generated by the site, ensuring that the discharge consent set by the Environment Agency is achieved consistently. The site is completely unmanned and remote, where monitoring technicians are only required to attend site twice per month in order to assess the success of the biological process. Through an online SCADA control system, operation of the treatment plant can be monitored and controlled remotely, trends in results can be observed, and daily data and treatment records downloaded. This treatment plant is an example of how leachate from old closed landfills can be effectively managed, with very low costs of operation, maintenance and site attendance. This paper presents comprehensive analytical and volumetric treatment data from the Bleakdown LTP, before presenting practical steps that would enable this success to be replicated at similar remote closed landfill sites.

Lab and pilot scale tests as tools for upgrading - comparison with full scale results

1998 ◽  
Vol 37 (9) ◽  
pp. 25-31 ◽  
Author(s):  
Åsa Malmqvist ◽  
Lars Gunnarsson ◽  
Christer Torstenon
Keyword(s):  
Biological Treatment ◽  
Low Cost ◽  
Treatment Plant ◽  
Paper Mill ◽  
Pilot Scale ◽  
Full Scale ◽  
Organic Load ◽  
Small Scale ◽  
Design Data ◽  
Biofilm Process

Parameters such as hydraulic retention time, organic load, maximum COD removal, sludge characteristics and optimal nutrient dosage can be determined by simulation in small scale models of the chosen process. Laboratory tests are the natural first step when considering upgrading, or designing a new, biological treatment plant. The potential for a biological treatment can be examined at a low cost and within a minimum of time, often through parallel testing of different treatment methods. Once a suitable process configuration has been found, lab scale tests may well be used for optimizing the process and obtaining design data, thus minimizing the need for more expensive tests in larger scale. The principal reason for a pilot plant test is the possibility to investigate natural variations in wastewater composition and the effect this will have on process stability. The use of laboratory and pilot scale tests is here illustrated by the work carried out prior to the upgrading of the treatment plant at Nyboholm paper mill. A description of the upgraded full scale installation consisting of both chemical treatment and a suspended-carrier biofilm process is included and a comparison between results from lab, pilot and full scale treatment is made.

Leachate Treatment: Design Recommendations for Small but Extremely Fluctuating, Highly Polluted Quantities of Water

1990 ◽  
Vol 22 (3-4) ◽  
pp. 307-314 ◽  
Author(s):  
Karl Heinz Hartmann ◽  
Erhard Hoffmann
Keyword(s):  
Treatment Plant ◽  
Domestic Wastewater ◽  
Hazardous Substances ◽  
Plant Design ◽  
Leachate Treatment ◽  
Sewer System ◽  
Sewer Systems ◽  
Decentralized Treatment ◽  
Domestic Wastewater Treatment ◽  
Treatment And Disposal

Today's practice in leachate treatment and disposal in the FRG comprises two possibilities:a) the combined leachate domestic wastewater treatment (transportation to the treatment plant either using the sewer system or tank trucks)b) complete, decentralized treatment at the source of the leachate production. As a result of the updating of the general water management law (WHG § 7a) the discharge of waste waters containing dangerous substances (e.g. AOX) into sewer systems is no longer permitted. As there is no possibility of a selective removal of the hazardous substances, the future consequence will be that the whole amount of leachate has to be treated at the landfill site. Existing leachate treatment plants are often designed for average loading rates. Because of the high fluctuations of the leachate quantity such plants are often overloaded. In the past there were two solutions:a) temporary transportation to a municipal treatment plant using trucks,b) recycling of the excessive leachate volume. As transportation is no longer accepted there is only the possibility of recycling left. The feasibility of buffering the runoff peaks has not yet been studied in detail (reservoir management). This cost-favourable option (earth basin with sealing) offers two advantages. First, the plant design can be based on mean conditions while secondly the loading of the plant will be almost constant (no variation concerning the hydraulic loading; concentration equalization effect of the storage tank). Herewith an attractive way of adapting existing plants to the time dependent changing requirements is available.

An Investigation into the Pre-Treatment of Dairy Wastewater Prior to Aerobic Biological Treatment

1994 ◽  
Vol 29 (9) ◽  
pp. 205-212 ◽  
Author(s):  
B. Kasapgil ◽  
G. K. Anderson ◽  
O. Ince
Keyword(s):  
Biological Treatment ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Dairy Wastewater ◽  
Dissolved Air Flotation ◽  
The United Kingdom ◽  
Pre Treatment ◽  
Urban Wastewater Treatment ◽  
Final Effluent ◽  
Dissolved Air

Implementation of the EC Directive on Urban Wastewater Treatment has led to the introduction of more stringent discharge standards being imposed by the Regulating Agencies in the United Kingdom. It is for this reason that this investigation into the pre-treatment of a dairy wastewater prior to aerobic biological treatment was carried out. In order to upgrade the existing treatment plant at a local dairy a Dissolved Air Flotation (DAF) and an anaerobic digestion system as pre-treatment process were studied at pilot - scale. Results obtained from this study showed that the existing aerobic biological treatment plant failed to achieve both the present consent conditions and those required in 1995. It was shown that an anaerobic filter would enable the plant to meet the discharge standards proposed by the National Rivers Authority but due to the configuration of the land available for new works it is recommended that the existing aerobic biological filter be replaced by an activated sludge system. It is anticipated that such a system would reduce the final effluent COD to less than 125 mg/l.

Use of chemical upgrading (CU) in Hungary and Slovakia

1994 ◽  
Vol 30 (5) ◽  
pp. 87-95 ◽  
Author(s):  
Susan E. Murcott ◽  
Donald R. F. Harleman
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Metal Salts ◽  
Plant Performance ◽  
Eastern European ◽  
Low Doses ◽  
The Past ◽  
Treatment Technologies

In the past decade, the development of polymers and new chemical technologies has opened the way to using low doses of chemicals in wastewater treatment. “Chemical upgrading” (CU) is defined in this paper as an application of these chemical technologies to upgrade overloaded treatment systems (typically consisting of conventional primary plus biological treatment) in Central and Eastern European (CEE) countries. Although some of the chemical treatment technologies are proven ones in North America, Scandinavia, and Germany, a host of factors, for example, the variations in composition and degree of pollution, the type of technologies in use, the type and mix of industrial and domestic sewage, and the amount of surface water, had meant that the viability of using CU in CEE countries was unknown. This report describes the first jar tests of CU conducted during the summer of 1993. The experiments show CU's ability to improve wastewater treatment plant performance and to potentially assist in the significant problem of overloaded treatment plants. Increased removal of BOD, TSS, and P in the primary stage of treatment is obtained at overflow rates above 1.5 m/h, using reasonably priced, local sources of metal salts in concentrations of 25 to 50 mg/l without polymers.

Two-stage chemical-biological treatment at Thessaloniki greater area WWTP - experiences and potentials

1995 ◽  
Vol 32 (9-10) ◽  
pp. 75-84 ◽  
Author(s):  
A. D. Andreadakis ◽  
G. H. Kristensen ◽  
A. Papadopoulos ◽  
C. Oikonomopoulos
Keyword(s):  
Biological Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Primary Treatment ◽  
Effective Control ◽  
Two Stage ◽  
Effluent Quality ◽  
Filamentous Microorganisms ◽  
Sludge Settling ◽  
The City

The wastewater from the city of Thessaloniki is discharged without treatment to the nearby inner part of the Thessaloniki Gulf. The existing, since 1989, treatment plant offers only primary treatment and did not operate since the expected effluent quality is not suitable for safe disposal to the available recipients. Upgrading of the plant for advanced biological treatment, including seasonal nitrogen removal, is due from 1995. In the mean time, after minor modifications completed in February 1992, the existing plant was put into operation as a two-stage chemical-biological treatment plant for 40 000 m3 d−1, which corresponds to about 35% of the total sewage flow. The operational results obtained during the two years operation period are presented and evaluated. All sewage and sludge treatment units of the plant perform better than expected, with the exception of the poor sludge settling characteristics, due to severe and persistent bulking caused by excessive growth of filamentous microorganisms, particularly M. Parvicella. Effective control of the bulking problem could lead to more cost-effective operation and increased influent flows.

Modelling the performance of anaerobic wastewater stabilization ponds

1995 ◽  
Vol 31 (12) ◽  
pp. 171-183 ◽  
Author(s):  
M. M. Saqqar ◽  
M. B. Pescod
Keyword(s):  
Wastewater Treatment ◽  
Water Temperature ◽  
Removal Efficiency ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Pond Water ◽  
Removal Efficiencies ◽  
Wastewater Stabilization Ponds ◽  
Raw Wastewater

The performance of the primary anaerobic pond at the Alsamra Wastewater Treatment Plant in Jordan was monitored over 48 months. Overall averages for the removal efficiencies of BOD5, COD and suspended solids were 53%, 53% and 74%, respectively. An improvement in removal efficiency with increase in pond water temperature was demonstrated. A model, which takes into account the variability of raw wastewater at different locations, has been developed to describe the performance of a primary anaerobic pond in terms of a settleability ratio for the raw wastewater. The model has been verified by illustrating the high correlation between actual and predicted pond performance.

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