Modelling and pilot plant investigations of high rate deep bed filtration with permeable synthetic filter media

2002 ◽  
Vol 2 (1) ◽  
pp. 223-232 ◽  
Author(s):  
R. Gimbel ◽  
A. Hahrstedt ◽  
K. Esperschidt
Keyword(s):  
Waste Water Treatment ◽  
Pilot Scale ◽  
High Rate ◽  
Deep Bed Filtration ◽  
Transport Efficiency ◽  
Brownian Particles ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Porous Plastic ◽  
Highly Porous

Permeable Synthetic Collectors (PSCs) are bodies of several millimetres consisting of a highly porous arrangement of fixed fibres or open-porous plastic foam. The advantages of the application of this media in deep bed filtration were studied. The theoretical analysis of the particle transport efficiency was based on the numerical solution of the flow field and on trajectory calculations for non-Brownian particles. Investigations with an endoscope allowed the consideration of the particle adhesion on the surface of the inner fibres. The resulting filter coefficients are compared with experimental data. The application of PSC filtration in a pilot scale unit for waste water treatment performs much better in contrast to conventional filter grains (sand, anthracite etc.), especially under high rate conditions. In the future, the deep filtration can be applied to new fields of the topic of solid-liquid separation with smaller units, lower pressure drop and higher filtration rates.

From basic investigations to pilot plant tests of depth filtration with permeable synthetic collectors

2001 ◽  
Vol 1 (2) ◽  
pp. 141-150
Author(s):  
A. Nahrstedt ◽  
K. Esperschidt ◽  
R. Gimbel
Keyword(s):  
Pilot Scale ◽  
High Rate ◽  
Transport Efficiency ◽  
Trajectory Calculations ◽  
Brownian Particles ◽  
Depth Filtration ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Porous Plastic ◽  
Highly Porous

Permeable Synthetic Collectors (PSCs) are bodies of some millimetres consisting of a highly porous arrangement of fixed fibres or open-porous plastic foam. The advantages of the application of this media in deep bed filtration were studied. The theoretical analysis of the particle transport efficiency was based on the numerical solution of the flow field and on trajectory calculations for non-Brownian particles. Investigations with an endoscope allowed the consideration of the particle adhesion on the surface of the inner fibres. The resulting filter coefficients are compared with experimental data. The application of PSC filtration in a pilot scale unit for wastewater treatment performs much better in contrast to conventional filter grains (sand, anthracite etc.), especially under high rate conditions. In the future, the deep filtration can be applied to new fields of the topic of solid liquid separation with smaller units, lower pressure drop and higher filtration rates.

Field facility for research and demonstration of CSO treatment technologies

1997 ◽  
Vol 36 (8-9) ◽  
pp. 391-396
Author(s):  
D. Averill ◽  
D. Mack-Mumford ◽  
J. Marsalek ◽  
R. Andoh ◽  
D. Weatherbe
Keyword(s):  
Pilot Scale ◽  
High Rate ◽  
Uv Disinfection ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Treatment Technologies ◽  
Test Threshold ◽  
Vortex Separator ◽  
Solid Liquid ◽  
Solid Liquid Separation

A pilot scale study of options for the treatment combined sewer overflows is being conducted in Ontario, Canada. The objective is to achieve primary clarification equivalency in simple, high-rate satellite treatment systems. Effluent disinfection will also be required where bathing beaches are to be protected. Long column settling tests conducted with CSO suspensions indicated that approximately 40% of the suspended solids was non-settleable at the test threshold of 0.3 m/h. The use of a cationic polymer as the sole coagulant in a three metre diameter vortex separator achieved at least 50% TSS removal at surface loads up to approximately 40 m/h. The effluents from solid/liquid separation operations using the polymer coagulation strategy were more amenable to UV disinfection than those produced with metal-based coagulants. This document has been updated to include experimental results to mid-1997.

Pilot Plant Studies on Filtration of Raw Sewage Using Floating Filter Media and Multiple Filter Column Inlets

1993 ◽  
Vol 28 (7) ◽  
pp. 143-151 ◽  
Author(s):  
Mitsuo Mouri ◽  
Chiaki Niwa
Keyword(s):  
Filtration Rate ◽  
Pilot Scale ◽  
Primary Treatment ◽  
Medium Size ◽  
Filter Surface ◽  
And Performance ◽  
Run Lengths ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Soluble Components

The characteristics and performance of solid-liquid separation of raw sewage using floating media and multiple inlets were studied using pilot-scale equipment. Particles over 7 µm, representing approximately 80% of SS and 50% of BOD in raw sewage were efficiently removed. Smaller particles and soluble components, comprising a large part of total BOD, were difficult to remove by filtration. The maximum SS removal ratio (SSRR) and SS quantity removed per unit filter surface (SSR) was achieved using a medium size of 5.5 mm and a filtration rate of 150 µm/d. Inlet switching to a lower position significantly extended the filter run lengths and increased the total SS removed by filtration. Using 5.5 mm filter particles and a 150 m/d filtration rate, 80-89% of SS was removed, 38-42 kg of SS was removed per unit filter sectional area, and filter runs were 55-65 hours. The backwash-filtrate ratio was around 2%. The space requirement of this system will be significantly smaller than the ordinary primary treatment system judging from the trial design of a prototype plant.

Performance and membrane foulant in the pilot operation of a novel biofilm-membrane reactor

2002 ◽  
Vol 2 (2) ◽  
pp. 177-183
Author(s):  
K. Kimura ◽  
Y. Watanabe
Keyword(s):  
Membrane Fouling ◽  
Membrane Reactor ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Manganese Concentration ◽  
Membrane Cleaning ◽  
Chemical Washing ◽  
Pre Treatment ◽  
Solid Liquid ◽  
Solid Liquid Separation

We have developed a novel biofilm-membrane reactor (BMR) in which a nitrifying biofilm is fixed on the surface of a rotating membrane disk. With this reactor, both strict solid-liquid separation and oxidation of ammonia nitrogen can be simultaneously performed. Based on the results obtained in previous bench-scale experiments, a pilot-scale study was conducted using river water at a water purification plant. The results obtained in the pilot study can be summarized as follows. (1) By implementation of pre-treatment (coagulation and sedimentation) and simple membrane cleaning (sponge cleaning), the filter run could be continued for 17 months without any chemical washing. (2) Sufficient nitrification was observed when water temperature was high. Deterioration in nitrification efficiency during winter was reduced by the addition of phosphorus. (3) In addition to nitrification, biological oxidation of AOC and manganese can be expected with the BMR. In this study, both AOC and manganese concentration in the permeate decreased to a level less than 10 μg/L. (4) Irreversible membrane fouling, which was thought to be mainly caused by manganese, became significant as the operation period became longer.

Household Membrane Bioreactor in Domestic Wastewater Treatment

1993 ◽  
Vol 27 (1) ◽  
pp. 171-178 ◽  
Author(s):  
C. Chiemchaisri ◽  
K. Yamamoto ◽  
S. Vigneswaran
Keyword(s):  
Wastewater Treatment ◽  
Hollow Fiber Membrane ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Experimental Unit ◽  
Transmembrane Pressure ◽  
Working Volume ◽  
Operational Life ◽  
Solid Liquid ◽  
Solid Liquid Separation

The activated sludge process coupled with hollow fiber membrane for solid-liquid separation was applied to treat low strength domestic wastewater. Pilot-scale experimental unit used in this study consisted of 2 modules of 0.03 μm pore size with 9 m2 surface area each, immersed in the reactor which has a maximum working volume of 1.5 m3. Even when sewage was fed at varying rates following its diurnal flow variation to the bioreactor, good stability of the process was achieved which was shown by the consistency in treated water quality. The effluent turbidity and COD were well within the limits (less than 0.5 NTU and 3-5 mg/L). The transmembrane pressure drop was less than 20 cm Hg even after 2 months of operation. Application of jet aeration could be used to prolong the operational life of the membrane in the bioreactor. This system is an ideal one to be used as household wastewater treatment system.

Pilot scale evaluation on ferric floc sludge concentration with pelleting flocculation blanket process

2010 ◽  
Vol 62 (9) ◽  
pp. 2021-2027
Author(s):  
Huang Ting-lin ◽  
Zhang Gang ◽  
Guo Ning ◽  
He Wen-jie ◽  
Han Hong-da ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pilot Scale ◽  
Operational Parameters ◽  
Experimental Conditions ◽  
High Efficient ◽  
High Turbidity ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
The Relationship ◽  
Sludge Concentration

Pelleting flocculation blanket (PFB) process has been successfully applied to high turbidity suspensions for high efficient solid/liquid separation. In this paper, by using the PFB process, a dynamic experimental study was carried out on concentrating ferric flocs sludge with a scale of 1.3–5.4 m3/h. The pilot experiment aimed to optimize the conditioning system and determine the operational parameters. Under the raw sludge concentrations of 103–1,154 mg/L, the system could achieve ideal conditioning effect with polyacrylamide (PAM) dosages of 0.3–2.7 mg/L, agitation speed of 10 rpm, and water up-flow rates of 18–48 m/h. Under the experimental conditions, the increase of polymer dosage would improve effluent turbidity and pellets settling behaviour, the moderate up-flow rate had no marked effect on treatment results, while too large surface loading could worsen effluent turbidity. The experimental results also revealed that there existed an approximately linear relationship between the raw sludge concentration and optimum PAM dosage, that is, the optimum dosage of PAM increased synchronously as the raw sludge concentration increased. While the relationship between the raw sludge concentration and maximum up-flow rate reflected another linear dependence, namely, the maximum up-flow rate would decreased linearly as the raw sludge concentration increased.

Continuous high-rate removal of chromate in a fluidised bed without sludge generation

1994 ◽  
Vol 30 (7) ◽  
pp. 31-40 ◽  
Author(s):  
Henrik Aktor
Keyword(s):  
Addition Reaction ◽  
Waste Product ◽  
High Rate ◽  
Disposal Site ◽  
Fluidised Bed ◽  
Specific Density ◽  
Fluid Bed ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Ash Disposal

The objective of the work presented here was to investigate the catalysing effect of iron oxyhydroxide on the redox reaction between ferrous iron and chromate. This was done in a bench-scale upflow reactor containing an expanded sand medium (fluid-bed reactor), where continous chemical addition, reaction and solid-liquid separation take place. Removal efficiencies of chromate in excess of 99% were attainable on spiked tapwater corresponding to an outlet concentration of 0.01 mg/l. Chromate polluted groundwater from a fly-ash disposal site was treated in the first full-scale plant (3 m3/h) with good results as well. The waste product generated by this method is a very compact granulate with a specific density of approx. 3 kg/l and low water content. Operation of the compact plant is simple and chemicals cost very little (approx. US D 1/400 per m3). The method (patent pending) is recommended for remediation purposes, but may also be applied in treatment of industrial wastewaters.

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