Reverse osmosis leachate treatment plant in UK

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.

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Aerobic deammonification: a new experience in the treatment of wastewaters

Water Science & Technology ◽

10.2166/wst.1997.0371 ◽

1997 ◽

Vol 35 (10) ◽

pp. 111-120 ◽

Cited By ~ 44

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.

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

Water Science & Technology ◽

10.2166/wst.2011.844 ◽

2012 ◽

Vol 65 (1) ◽

pp. 127-134 ◽

Cited By ~ 12

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.

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

Mokslas - Lietuvos ateitis ◽

10.3846/mla.2017.1068 ◽

2017 ◽

Vol 9 (4) ◽

pp. 406-412 ◽

Cited By ~ 1

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.

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

Water Science & Technology ◽

10.2166/wst.2004.0301 ◽

2004 ◽

Vol 50 (5) ◽

pp. 1-8 ◽

Cited By ~ 28

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.

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