Process combination of nanofiltration and adsorption: optimisation of an air and back flushing procedure

2003 ◽  
Vol 3 (5-6) ◽  
pp. 367-372
Author(s):  
J. Meier ◽  
T. Neymann ◽  
T. Melin
Keyword(s):  
Landfill Leachate ◽  
Cross Flow ◽  
Pilot Scale ◽  
Experimental Results ◽  
Permeate Flux ◽  
Leachate Treatment ◽  
Side Pressure ◽  
New Process ◽  
Major Factors ◽  
Process Combination

A new process combination integrating adsorption on powdered adsorbent into a nanofiltration process is applied to landfill leachate treatment on a pilot scale. Lab scale experiments have shown that the permeate flux is significantly increased by the application of a flushing procedure combining permeate back flushing and feed and air cross flow flushing. In this paper an optimisation strategy for the flushing procedure is described and first experimental results are presented. These results indicate that the cross flow flushing velocity and the number of permeate side pressure pulses are the major factors of the flushing procedure.

Effect of Fluidized Bed on Permeate Flux in Ceramic Membrane Cross-Flow Microfiltration

1995 ◽  
Vol 60 (12) ◽  
pp. 2074-2084
Author(s):  
Petr Mikulášek
Keyword(s):  
Fluidized Bed ◽  
Ceramic Membrane ◽  
Cross Flow ◽  
Experimental System ◽  
Experimental Results ◽  
Spherical Particles ◽  
Permeate Flux ◽  
Model Fluid ◽  
Optimum Porosity ◽  
Tubular Membranes

The microfiltration of a model fluid on an α-alumina microfiltration tubular membrane in the presence of a fluidized bed has been examined. Following the description of the basic characteristic of alumina tubular membranes, model dispersion and spherical particles used, some comments on the experimental system and experimental results for different microfiltration systems are presented. From the analysis of experimental results it may be concluded that the use of turbulence-promoting agents resulted in a significant increase of permeate flux through the membrane. It was found out that the optimum porosity of fluidized bed for which the maximum values of permeate flux were reached is approximately 0.8.

scholarly journals Pathways to economic viability: a pilot scale and techno-economic assessment for algal bioremediation of challenging waste streams

2020 ◽  
Vol 6 (12) ◽  
pp. 3400-3414
Author(s):  
Hannah Leflay ◽  
Katarzyna Okurowska ◽  
Jagroop Pandhal ◽  
Solomon Brown
Keyword(s):  
Economic Analysis ◽  
Landfill Leachate ◽  
Economic Assessment ◽  
Bacterial Consortium ◽  
Pilot Scale ◽  
Experimental Results ◽  
Economic Viability ◽  
Waste Streams

A microalgal–bacterial consortium was used for pilot scale bioremediation of landfill leachate. A techno-economic analysis was conducted using experimental results to provide a pathway for economic viability.

MARAPUR—a new process combination for the optimization of MBR

2008 ◽  
Vol 58 (11) ◽  
pp. 2101-2107
Author(s):  
F. Klegraf ◽  
J. Lahnsteiner
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Cross Flow ◽  
Mesh Size ◽  
Main Process ◽  
Biological Wastewater Treatment ◽  
Wastewater Treatment Process ◽  
Effective Measure ◽  
New Process ◽  
Process Combination

The MARAPUR concept is a biological wastewater treatment process based on the MBR functional principle. The ultrafiltration of activated sludge takes place in pressure-driven hollow fiber membranes. The vertical membrane modules are installed compactly in a MEGAMODUL. The permeate extraction is accomplished in the cross-flow, which is supported by rinsing aeration. The main process advantages are high filtration performance, excellent operation reliability provided by wastewater fine sieving and reduced cleaning chemicals demand. Wastewater fine sieving with a mesh size of 0.25 mm is an effective measure against membrane clogging by hair and fibers.

scholarly journals Influences of Technological Parameters on Cross-Flow Nanofiltration of Cranberry Juice

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 329
Author(s):  
Dat Quoc Lai ◽  
Nobuhiro Tagashira ◽  
Shoji Hagiwara ◽  
Mitsutoshi Nakajima ◽  
Toshinori Kimura ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Cross Flow ◽  
Pilot Scale ◽  
Nanofiltration Membrane ◽  
Feed Flow Rate ◽  
Permeate Flux ◽  
Cranberry Juice ◽  
Technological Parameters ◽  
Optimum Ph ◽  
Module Type

The paper focused on the influence of operative conditions on the separation of benzoic acid from 10 °Brix cranberry juice by cross-flow nanofiltration with a plate and frame pilot scale (DDS Lab Module Type 20 system). Six kinds of commercial nanofiltration membrane were investigated. The results showed that the rejection of benzoic acid was significantly lower than that of other components in cranberry juice, including sugars and other organic acids. In a range of 2–7.5 L/min, feed flow rate slightly affected the performance of nanofiltration. Higher temperatures resulted in higher permeate flux and lower rejection of benzoic acid, whereas rejection of sugar and organic acid was stable at a high value. In a range of 2.5–5.5, pH also significantly affected the separation of benzoic acid and negative rejection against benzoic acid was observed at pH 4.5 with some of the membranes. This implies that pH 4.5 is considered as an optimum pH for benzoic acid separation from cranberry juice. The lower permeate flux caused a lower rejection of benzoic acid and negative rejection of benzoic acid was observed at the low permeate flux. Pretreatment by ultrafiltration with CR61PP membranes could improve the permeate flux but insignificantly influenced the efficiency of separation. The results also indicated that NF99 and DK membranes can be effectively used to separate benzoic acid from cranberry juice.

Treatment of agricultural wastewater and reuse

2002 ◽  
Vol 46 (11-12) ◽  
pp. 177-182 ◽  
Author(s):  
W. Reimann
Keyword(s):  
Membrane Separation ◽  
Membrane Surface ◽  
Pilot Scale ◽  
Wash Water ◽  
Coliform Bacteria ◽  
Permeate Flux ◽  
Log Reduction ◽  
Agricultural Wastewater ◽  
Inorganic Substances ◽  
Process Combination

The use of membrane separation technology, such as ultrafiltration (UF) and subsequent reverse osmosis (RO), for purifying different types of low-contaminated wash water of carrots (COD = 1,314 mg/l) and wash water of different kinds of vegetables (COD = 2,280 mg/l) was investigated on a pilot scale to determine its suitability for reuse in the process. In both membrane processes, UF and RO, the permeate flux first decreased with increasing fouling (deposition of organic and inorganic substances on the membrane surface and in its pores). After that the membrane permeability (permeate flux) and selectivity (rejection of COD) remained constant on a stable level in spite of a concentration with a volumetric concentration factor of up to 39. The tests showed that water can be obtained with a quality complying with the German regulations by applying a process combination of UF and RO. It was found that the membranes gave a 5-log reduction for total bacteria, and no coliform bacteria were present in the permeate after RO. Using UF and RO, part of the wastewater can be recovered for reuse in the process if drinking water is used for the last step of vegetable washing.

First-order kinetics of landfill leachate treatment in a pilot-scale anaerobic sequence batch biofilm reactor

2014 ◽  
Vol 145 ◽  
pp. 385-393 ◽  
Author(s):  
Ronan Cleber Contrera ◽  
Katia Cristina da Cruz Silva ◽  
Dione Mari Morita ◽  
José Alberto Domingues Rodrigues ◽  
Marcelo Zaiat ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Pilot Scale ◽  
Biofilm Reactor ◽  
Leachate Treatment ◽  
First Order ◽  
First Order Kinetics ◽  
Kinetics Of

scholarly journals Membrane cleaning in membrane distillation of reverse osmosis concentrate generated in landfill leachate treatment

2021 ◽  
Author(s):  
Xiaolin Jia ◽  
Kuiling Li ◽  
Baoqiang Wang ◽  
ZhiChao Zhao ◽  
Deyin Hou ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Membrane Fouling ◽  
Membrane Distillation ◽  
Water Recovery ◽  
Permeate Flux ◽  
Chemical Cleaning ◽  
Leachate Treatment ◽  
Membrane Cleaning ◽  
Cleaning Methods

Abstract As a thermally induced membrane separation process, membrane distillation (MD) has drawn more and more attention for the advantages of treating hypersaline wastewaters, especially the concentrate from reverse osmosis (RO) process. One of the major obstacles in widespread MD application is the membrane fouling. We investigated the feasibility of direct contact membrane distillation (DCMD) for landfill leachate reverse osmosis concentrate (LFLRO) brine treatment and systematically assessed the efficiency of chemical cleaning for DCMD after processing LFLRO brine. The results showed that 80% water recovery rate was achieved when processing the LFLRO brine by DCMD, but the membrane fouling occurred during the DCMD process, and manifested as the decreasing of permeate flux and the increasing of permeate conductivity. Analysis revealed that the serious flux reduction was primarily caused by the fouling layer that consist of organic matters and inorganic salts. Five cleaning methods were investigated for membrane cleaning, including hydrogen chloride (HCl)-sodium hydroxide (NaOH), ethylene diamine tetraacetic acid (EDTA)-NaOH, critic acid, sodium hypochlorite (NaClO) and sodium dodecyl sulphate (SDS) cleaning. Among the chemical cleaning methods investigated, the 3 wt.% SDS cleaning showed the best efficiency at recovering the performance of fouled membranes.

scholarly journals REMOVAL OF REFRACTORY COMPOUNDS FROM LANDFILL LEACHATE BY USING NANOFILTRATION

2018 ◽  
Vol 80 (3-2) ◽  
Author(s):  
Titik Istirokhatun ◽  
Desinta Aswin Amalia ◽  
Wiharyanto Oktiawan ◽  
Arya Rezagama ◽  
M. Arief Budihardjo ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Nanofiltration Membrane ◽  
Permeate Flux ◽  
Leachate Treatment ◽  
Membrane Pore ◽  
Effluent Quality ◽  
Membrane Performance ◽  
Refractory Compounds ◽  
Membrane Pore Size ◽  
Synthetic Leachate

Landfill leachate is a serious problem during treatment of municipal solid waste using landfill method. Less attention has been paid for the treatment of this leachate while this leachate is usually highly polluted. This study investigated the performances of nanofiltration membrane for treatment of landfill leachate (from Semarang, Indonesia). Landfill leachate was treated using NF99 nanofiltration membrane (pore size 200 Da). Synthetic leachate was used in this research which follows the characteristics of real leachate. Microfiltration (MF) membrane was used as a pretreatment before Nanofiltration (NF). The effect of pressure on membrane performance was observed. The membrane performance was examined for permeate flux and membrane rejection for TSS, TDS, and COD then compared to the effluent quality of existing leachate treatment. The rejection of COD, TSS and TDS were 96, 100 and 62%, respectively. The results suggest that the effluent had much better quality than the existing installation leachate treatment.

scholarly journals REMOVAL OF COD AND AMMONIUM FROM LANDFILL LEACHATE BY USING A MODIFIED ECO - BIO – BLOCK MATERIAL IN ANOXIC-OXIC SYSTEM

2018 ◽  
Vol 54 (2A) ◽  
pp. 1
Author(s):  
Hoang Luong
Keyword(s):  
Flow Rate ◽  
Landfill Leachate ◽  
Low Cost ◽  
Experimental System ◽  
Laboratory Scale ◽  
Experimental Results ◽  
Leachate Treatment ◽  
Removal Efficiencies ◽  
Technical Solutions

The research on removal efficiencies of COD and NH4+ in landfill leachate by an application of the modified Eco - Bio -Block (EBB) material in Anoxic-Oxic (A-O) system was conducted in the laboratory scale. The experimental results showed that the treatment efficiencies of COD and NH4+ were relatively high. Removal efficiencies of COD and NH4+ in two columns (anoxic and oxic) were 35% and 50%, respectively, after 19-hour in the experimental system at the flow rate of 1 liter per hour. The results of this study might suggest technical solutions toward landfill leachate treatment at the low cost. Moreover, this method could be widely applied to other wastewater sources suitable in the condition of Vietnam.

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