US Patent No: 7,179,370
Number of patents in Portfolio can not be more than 2000
Energy-efficient biological treatment system with filtration membrane
Stats
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Feb 20, 2007
Issued date -
May 23, 2006
filing date -
11/439,318
serial no -
In Force
status
Importance
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Abstract
A membrane filtration system comprising one or more submerged ultrafiltration or microfiltration membrane assemblies at ambient pressure, each membrane assembly positioned 100 240 mm from a nearest wall, baffle, or adjacent membrane assembly and no more than 1 meter above a floor and at least 150 mm below the liquid level. Mixed liquor is discharged underneath each membrane assembly to create a vertical flow velocity in a range of 1 8 mm/second along an entire length of the membrane assembly. In a sequenced batch reactor system, a coarse bubble air diffuser for scouring each membrane assembly is supplied with air only during the backwash cycle of the filtration system and not during the filtration cycle. In a membrane bioreactor system, the biological treatment section is physically separated from the filtration section and fine bubble air diffusion is used in the biological treatment section.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,639,373 Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate | 128 | 1995 | |
| 6,193,890 System for maintaining a clean skein of hollow fibers while filtering suspended solids | 83 | 1999 | |
| 6,319,411 Method of maintaining clean vertical skeins of hollow fiber membranes and system therefor | 44 | 1999 | |
| 6,303,035 Immersed membrane filtration process | 45 | 1999 | |
| 6,375,848 Water filtration using immersed membranes | 50 | 1999 | |
| 6,245,239 Cyclic aeration system for submerged membrane modules | 61 | 2000 | |
| 6,656,356 Aerated immersed membrane system | 48 | 2001 | |
| 6,682,652 Apparatus for withdrawing permeate using an immersed vertical skein of hollow fiber membranes | 36 | 2002 | |
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| 5,254,253 Modular shipboard membrane bioreactor system for combined wastewater streams | 77 | 1992 | |
| 5,248,424 Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate | 139 | 1992 | |
| 5,910,250 Baffle for conversion of fine bubbles to coarse while filtering with a vertical skein of hollow fibers | 87 | 1997 | |
| 5,944,997 System for maintaining a clean skein of hollow fibers while filtering suspended solids | 103 | 1998 | |
| 6,361,695 Shipboard wastewater treatment system | 53 | 2000 | |
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| 6,156,200 Gas-scrubbed hollow fiber membrane module | 87 | 1998 | |
| 6,555,005 Scouring method | 61 | 1999 | |
| 6,524,481 Apparatus and method for cleaning membrane filtration modules | 55 | 2001 | |
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| 6,110,374 Treatment process for removing microbial contaminants suspended in wastewater | 13 | 1998 | |
| 6,613,222 Apparatus for the treatment of waste water | 21 | 2001 | |
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| 4,715,953 Hollow fiber separation device manifold | 21 | 1983 | |
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| 4,468,327 Effluent treatment | 17 | 1983 | |
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| 4,414,113 Liquid purification using reverse osmosis hollow fibers | 63 | 1982 | |
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| 4,886,601 Column filter using bundles of long fibers | 49 | 1989 | |
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| 4,647,377 Filter apparatus | 71 | 1984 | |
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| 2004/0035,779 Membrane filter for water treatment | 7 | 2003 | |
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| 5,192,456 Apparatus for treating activated sludge and method of cleaning it | 96 | 1992 | |
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| 4,605,500 Hollow-fiber filter module | 29 | 1985 | |
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| 4,749,494 Treatment of waste water by the activated sludge process | 26 | 1987 | |
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| 6,743,362 Sewage treatment process | 30 | 2002 | |
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| 6,126,819 Apparatus for the treatment of liquids contaminated by foreign substances | 33 | 1998 | |
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| 5,494,577 Membrane bioreactor with gas lift system | 15 | 1994 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Aug 20, 2014 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 20, 2018 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |