Experiences and new developments in biological pretreatment and physical post-treatment of landfill leachate

1996 ◽  
Vol 34 (7-8) ◽  
pp. 445-453 ◽  
Author(s):  
G. Baumgarten ◽  
C. F. Seyfried
Keyword(s):  
Reverse Osmosis ◽  
Treatment Plant ◽  
Post Treatment ◽  
Biological Pretreatment ◽  
Nanofiltration Membranes ◽  
Leachate Treatment ◽  
New Developments ◽  
Operational Costs ◽  
Treatment Stage ◽  
Operational Capacity

The leachate treatment plant of the landfill in Mechernich including biological pretreatment, reverse osmosis and evaporation and drying of the concentrate has been in operation since the beginning of 1994. Originally the plant was designed for a capacity of 130 m3/d. In the future, an average leachate amount of ca. 280 m3/d and even considerably higher montly peaks must be assumed. The necessary enlargement of the biological pretreatment will be realized by a second biological contactor plant. Corresponding to the operation of the existing plant a large amount of the ammonium can be eliminated under aerobic conditions by deammonification so no enlargement of the denitrification stage is needed. by simply replacing the reverse osmosis membranes by nanofiltration membranes, an operational capacity of ca. 280 m3/d may easily be achieved at the existing physical post-treatment stage. With the aid of this enlargement conception, the relatively high operational costs at present will be reduced considerably.

Aerobic deammonification: a new experience in the treatment of wastewaters

1997 ◽  
Vol 35 (10) ◽  
pp. 111-120 ◽  
Author(s):  
Anke Hippen ◽  
Karl-Heinz Rosenwinkel ◽  
Goetz Baumgarten ◽  
Carl F. Seyfried
Keyword(s):  
Reverse Osmosis ◽  
Treatment Plant ◽  
Nitrogen Transformations ◽  
Biological Pretreatment ◽  
Leachate Treatment ◽  
Aerobic Conditions ◽  
Negligible Amount ◽  
The Past

The leachate treatment plant of the landfill in Mechernich including biological pretreatment, reverse osmosis and evaporation and drying of the concentrate has been in operation since the beginning of 1994. Balancing the nitrogen transformations in the biological contactor plant as the nitrification step in the biological pretreatment, a large amount of the ammonium can be eliminated under aerobic conditions by deammonification. It succeeded obviously under the special conditions to establish a non-negligible amount of denitrifying ammonia oxidants. Experiences concerning this effect were described several times in the past.

scholarly journals Economic aspects of landfill leachate treatment using reverse osmosis membranes

Vestnik MGSU ◽  
2021 ◽  
pp. 698-719
Author(s):  
Alexey G. Pervov ◽  
Tatiana N. Shirkova ◽  
Dmitriy V. Spitsov
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Salt Content ◽  
Operating Costs ◽  
Alternative Methods ◽  
Ammonium Ions ◽  
Nanofiltration Membranes ◽  
Mineral Salts ◽  
Leachate Treatment

Introduction. Landfill leachates contain highly concentrated organic products of waste degradation and mineral salts. Concentrations of organic matter demonstrate high COD values up to 5,000 mg/l, concentrations of ammonium ions reach 2,500 mg/l, while the total salt content may reach 15,000 mg/l. Two to three reverse osmosis treatment stages may be nee­ded to produce the water that meets effective regulations governing the composition of water discharged into the environment. Also, high salt content and COD values dramatically reduce the membrane capacity. The co-authors explored the use of nanofiltration membranes at the first stage of the leachate treatment in an effort to reduce membrane operation costs. Materials and methods. The experiments, conducted within the framework of this research undertaking, allowed to identify a change in the concentrations of contaminants, dissolved in the leachates of reverse osmosis and nanofiltration membranes, as well as the reduced capacity of membranes at each stage of treatment. The co-authors have studied the alternative methods that may ensure maximal reduction of the concentrate consumption in the process of leachate treatment. Principal dependencies, derived as a result of the research, enabled the co-authors to identify the concentrate consumption rates depending on the extent of treatment focused on ammonium ions. The co-authors describe the methodology employed to identify the area of membranes at each treatment stage depending on the leachate composition. Results. Calculations of operating costs are provided for three compositions of leachates, typical for the Moscow region, depending on the treatment methodology and further recovery of membrane concentrates. Conclusions. Nanofiltration membranes can be used at the first stage of the landfill leachate treatment in the case of high COD and salt content. The application of nanofiltration membranes allows to reduce the concentrate consumption rate and cut operating costs. A new technology is developed to split the concentrate into two flows: the flow that has a high organic matter content, and the flow that has a high content of mineral salts, sodium and ammonium chlorides in order to facilitate the recovery of the concentrate.

Short- and long-term fouling characteristics of reverse osmosis membrane at full scale leachate treatment plant

2012 ◽  
Vol 65 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Weerapong Rukapan ◽  
Benyapa Khananthai ◽  
Chart Chiemchaisri ◽  
Wilai Chiemchaisri ◽  
Thirdpong Srisukphun
Keyword(s):  
Reverse Osmosis ◽  
Pure Water ◽  
Water Flux ◽  
Treatment Plant ◽  
Full Scale ◽  
Short Term ◽  
Leachate Treatment ◽  
Sedimentation Tank ◽  
Pure Water Flux

This research is focused on characterizing the foulants on a reverse osmosis (RO) membrane taken from a full-scale leachate treatment plant in Thailand. The system consists of a physico-chemical pre-treatment unit and RO system and has been in operation for 2 years. Ferric chloride (FeCl3) was added to the open-jet sedimentation tank at 2.0–2.5 g/l dosage for chemical coagulation. The supernatant from the sedimentation tank was polished using a pressurized sand filter prior to entering the RO system. The RO unit consists of seven pressurized vessels and 42 membrane elements (6 elements in each vessel). The recovery ratio and operating pressure in the RO system were maintained at 50% and 1.5–2.5 MPa. Fouled membranes obtained from short-term (6 months) and long-term operation (2 years) were taken from the system and analyzed by autopsy and sequential cleaning methods. The analysis of foulants on the membrane surfaces revealed that Fe deposits at 3.11 g/m2. For short-term operated membranes, water cleaning could recover 32.14 and 7.45% of initial pure water flux on the 1st and 6th membrane elements. NaOH cleaning, however, recovered more than 90% of initial flux, much higher than that of HCl solution in both elements. For long-term operated membranes, pure water flux recovery was below 5% for both 1st and 6th elements. Sequential cleaning by NaOH followed by HCl yielded the best results. Nevertheless, flux recovery through sequential cleaning of long-term operated membranes was only 35.3 and 19.1% for the 1st and the 6th elements, respectively.

scholarly journals Pine-derived Biochar as Option for Adsorption of Сu, Zn, Cr, Pb, Ni and Decreasing of BOD5 in Landfill Leachate

2017 ◽  
Vol 9 (4) ◽  
pp. 406-412 ◽  
Author(s):  
Valeriia Chemerys ◽  
Edita Baltrėnaitė
Keyword(s):  
Particle Size ◽  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Heating Temperature ◽  
Low Cost ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Low Oxygen ◽  
Leachate Treatment ◽  
Main Site

Landfill leachate is a highly toxic and hazardous form of wastewater due to its complex composition characteristics, e.g. ammonia, metals, organic compounds. Landfill leachate treatment technologies, such as flotation, coagulation/flocculation, precipitation, oxidation, micro-, ultra-, nanofiltration, reverse osmosis, are too expensive, because they require frequent regeneration of the media or generate secondary brine wastes that may pose a disposal problem. In the present study removal of Zn, Ni, Cr, Pb, Cu from Kazokiškės landfill leachate was studied. Kazokiškės landfill is the main site for disposal of Vilnius region municipal wastes. Operator of the landfill is interested in the alternative ways for the primary treatment of the landfill leachate for reducing the load on the expensive reverse osmosis. One of the proposed options for the primary landfill leachate treatment was adsorption by biochar. Due to the high specific surface area, well-developed porous structure and surface functionality biochar has been used as low-cost adsorbent for adsorption of PTEs from aqueous solutions. Biochar was produced from Scots pine (Pinus sylvestris L.) trunk wood (after debarking) by pyrolysis at the highest heating temperature of 700 °C for 45 min in the low-oxygen environment. Laboratory analysis showed that PTEs, such as Zn, Ni, Cr, Pb, Cu, were present in the landfill leachate before water treatment plant. Thus, the aim of the study was to evaluate PTEs (Zn, Ni, Cr, Pb, Cu) removal efficiency by adsorption by pine-derived biochar. Factors, affecting adsorption efficiency, such as biochar particle size (1, 2.5, 4, 5 mm) and dosage of the biochar (1.01, 3.5, 6.05, 9.45, 13.25, 17.82 g/100 ml of leachate) were studied. Effects of the biochar on pH of the landfill leachate, BOD5, PTEs adsorption were analyzed. The findings showed that optimal parameters for decreasing of BOD5 and retention of Cr and Pb were particle size 1 mm and dosage 6.05 g/100 ml of leachate and 1 mm and more than 13.25 g/100 ml of leachate, respectively. No positive effect on Cu and Zn was observed.

Removal of endocrine disrupting compounds with membrane processes in wastewater treatment and reuse

2004 ◽  
Vol 50 (5) ◽  
pp. 1-8 ◽  
Author(s):  
T. Wintgens ◽  
M. Gallenkemper ◽  
T. Melin
Keyword(s):  
Contact Angle ◽  
Wastewater Treatment ◽  
Reverse Osmosis ◽  
Treatment Plant ◽  
Endocrine Disrupting Compounds ◽  
Membrane Bioreactors ◽  
Biological Degradation ◽  
Leachate Treatment ◽  
Endocrine Disrupting ◽  
The Subject

Endocrine disrupting compounds can affect the hormone system in organisms and are the subject of environmental and human health concerns. The effluents of wastewater treatment plants contribute to the emission of estrogenically active substances into the environment. Membrane technology, which is an advanced wastewater treatment option, is the subject of this research. The removal techniques under investigation are membrane bioreactors, reverse osmosis, and nanofiltration. Eleven different nanofiltration membranes were tested in the laboratory set-up. The observed retention of NP and BPA ranged between 70% and 100%. The contact angle is an indicator for the hydrophobicity of a membrane, whose influence on the permeability and retention of NP was evident. Regarding the retention of BPA no dependency on the contact angle was observed. Results of the investigation of a full-scale landfill leachate treatment plant indicate a bisphenol A (BPA) removal of more than 98% with membrane bioreactors and reverse osmosis. The mass balance indicates that biological degradation is the most important removal process in the membrane bioreactor configuration.

REDUCING ENVIRONMENTAL RISK OF LANDFILLS: LEACHATE TREATMENT BY REVERSE OSMOSIS

2012 ◽  
Vol 11 (12) ◽  
pp. 2319-2331 ◽  
Author(s):  
Maria Gavrilescu ◽  
Ana-Maria Schiopu ◽  
George Ciprian Piuleac ◽  
Corneliu Cojocaru ◽  
Ion Apostol ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Environmental Risk ◽  
Leachate Treatment

Innovative concepts of regeneration of decolorization ion exchange resins in sugar refineries

2016 ◽  
pp. 377-380
Author(s):  
Marc André Théoleyre ◽  
Anne Gonin ◽  
Dominique Paillat
Keyword(s):  
Ion Exchange ◽  
Reverse Osmosis ◽  
Energy Supply ◽  
Ion Exchange Resins ◽  
Salt Solutions ◽  
Nanofiltration Membranes ◽  
Local Conditions ◽  
Salt Consumption ◽  
Multiple Effect ◽  
Exchange Resins

Regeneration of resins used for decolorization of sugar solutions is done with concentrated salt solutions. Nanofiltration membranes have been proven effective, in terms of industrial efficiency in decreasing salt consumption. More than 90% of the salt that is necessary for regeneration can be recycled through a combination of direct recycling of intermediate eluates, the separation of colored compounds by use of very selective nanofiltration membranes and a system to concentrate salty permeates. According to specific local conditions on energy supply and cost, the concentration of salty permeates can be either a multiple effect evaporator or a combination of electrodialysis and reverse osmosis. The desalted color compound solution is sent to the molasses, limiting considerably the effluent to be treated. Starting from a liquor of 800 IU, the water requirement is limited to less than 100 L/t of sugar and the amount of wastewater can be reduced to less than 40 L/t of sugar.

An improved small sewage treatment plant for biological purification of wastewater

1994 ◽  
Vol 29 (12) ◽  
pp. 23-29 ◽  
Author(s):  
G. Voigtländer ◽  
E.-P. Kulle
Keyword(s):  
Energy Supply ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Septic Tank ◽  
Additional Energy ◽  
Anaerobic Reactor ◽  
Step Process ◽  
Operational Costs ◽  
Aerobic Reactor

The paper presents a small sewage treatment plant (package plant) operating without additional energy. Purification of sewage is achieved in a three-step process: sedimentation tank, anaerobic reactor and wastewater pond or aerobic reactor. The efficiency of the anaerobic reactor - in contrast to the efficiency of a common septic tank - is significantly increased by using fixed biomass systems. Further degradation of sewage compounds by adhering microorganisms occurs in pond or aerobic reactor. The bed for the aerobic biomass is made of a semipermeable plastic film and arranged in order to ensure simultaneous supply of oxygen. The three pilot plants are showing different results. The main aims of research i.e. lowering of operational costs, energy supply, minimizing of maintenance expenditure and cleaning work, reliability of degradation efficiency have been achieved so far for the anaerobic reactor.

Evaluation of the alternative treatment processes to upgrade an Opium alkaloid wastewater treatment plant

2000 ◽  
Vol 41 (1) ◽  
pp. 223-230 ◽  
Author(s):  
M.F. Sevimli ◽  
A.F. Aydin ◽  
Ì. Öztürk ◽  
H.Z. Sarikaya
Keyword(s):  
Activated Sludge ◽  
Alternative Treatment ◽  
Treatment Plant ◽  
Post Treatment ◽  
Anaerobic Sludge ◽  
Processing Plant ◽  
Two Stage ◽  
Sludge Treatment ◽  
Treatment Processes ◽  
Opium Alkaloid

The aim of this study is to characterize the wastewater from an opium alkaloid processing plant and to evaluate alternative treatment techniques to upgrade an existing full-scale biological activated sludge treatment plant having problems of high residual COD and unacceptable dark brown color. In this content firstly, long term operational records of the two stage aerobic activated sludge treatment plant of the opium alkaloid factory located in Afyon province of Turkiye were evaluated. The operating results for the last three years were statistically analyzed and median and 95-percentile values were determined for the parameters including chemical and biological oxygen demand (COD and BOD5) and treatment efficiencies. Specific wastewater generation was found as 6.7 m3 per ton of the opium capsule processed. In the following stage of the study, three additional treatment processes were experimentally tested: anaerobic pretreatment, post treatment of aerobically treated effluents with lime and ozone. Pilot scale upflow anaerobic sludge blanket reactor (UASBR) experiments have demonstrated that about 70 percent of the incoming COD can be removed anaerobically. Chemical treatability studies with lime for the aerobically treated effluent have shown that about 78 percent color and 46 percent COD removals can be obtained with lime dosage of 25 gl−1. Post treatment of the effluents of the existing two stage aerobic treatment with ozone also resulted in significant color and COD reduction.

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