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Water Treatment Methods

a water treatment method and wastewater technology, applied in water treatment multi-stage treatment, filtration separation, separation processes, etc., can solve the problems of increasing the initial cost of the system, increasing the initial and maintenance costs of the filter unit, and increasing the maintenance cost of the mechanical seal

Inactive Publication Date: 2011-07-21
SIEMENS ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention relates to a system and method for treating wastewater. The method involves filtering contaminants from a liquid by passing it through a filter vessel containing walnut shell media and a draft tube system. The method also includes interrupting the flow of the liquid and passing a second fluid through the filter media and the peripheral zone to remove at least a portion of the oil and suspended solids. The system includes a filter vessel with a walnut shell filter media and a draft tube system, and a method for interrupting the flow of the liquid and passing a gas through the draft tube system to separate the contaminant from the filter media. The invention also includes a method for setting a filter bed by interrupting the flow of the liquid and passing a gas through the draft tube system in a direction counter to the liquid. The technical effects of the invention include efficient and effective treatment of wastewater with reduced contamination levels."

Problems solved by technology

Mechanical systems used to backwash beds increase the initial costs of the system and may lead to increased maintenance costs to service mechanical seals.
Recirculation of the bed also increases the initial and maintenance costs of the filter unit and increases the footprint of the filter unit with additional pumps for recirculation.
The mechanical backwash methods also utilize backwash fluid to remove any oil and suspended solids released from the bed, which leads to the generation of significant amounts of backwash fluid.
Similarly, the use of high velocity backwash liquid generates a large volume of backwash fluid.
Conventional backwash systems are also known to create dead spots in which the filter media is not sufficiently turned and / or in which the backwash fluid does not reach, effectively leaving oil and suspended solids in the bed.

Method used

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  • Water Treatment Methods
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Examples

Experimental program
Comparison scheme
Effect test

example i

[0071]An experiment was conducted to determine the effectiveness of a pulsed water backwash. A test apparatus was configured with a clear plastic column having a diameter of about 12 inches and a height of about 12 feet. A draft tube having a diameter of about 3 inches and a height of about 5 feet was placed at the center of the column. An air diffuser was attached to an air inlet at the base of the draft tube. Three nozzles for delivering water were equally spaced about the periphery of the column. Each nozzle included an elbow to direct water tangentially in the column. The column was filled with 66 inches of black walnut shells so that the shell bed extended approximately 6 feet above the height of the draft tube.

[0072]A series of tests were performed to measure the effect of air and water flow rates during backwash. Backwash efficiency was measured in the velocity of the walnut shells traveling down the outside of the draft tub in the peripheral zone. A portion of the walnut she...

example ii

[0076]A test was conducted to determine the effectiveness of backwashing a black walnut shell filter having multiple draft tubes in comparison to a single draft tube. In a first test, a vessel having a diameter of 4 feet had one centrally located draft tube having a diameter of 12 inches was fabricated. A portion of the walnut shells were painted for identification and windows were positioned at various locations in the vessel to observe the movement of the walnut shells. In a second test, a vessel having a diameter of 4 feet included 4 draft tubes each having a diameter of 6 inches was fabricated. The 4 draft tubes were equally spaced throughout the vessel. Backwash water volume and gas volume were identical for both tests.

[0077]Visual results indicated that the multiple draft tube design was at least as effective at rolling the bed as the single draft tube design, and in some instances was even more effective. Without being bound by any particular theory, the presence of multiple ...

example iii

[0078]A pilot test was conducted to determine the effectiveness of backwashing a black walnut shell filter having a baffle positioned in a draft tube. A filter media vessel having a diameter of 4 feet was fitted with a draft tube made from a 12 inch diameter pipe. A baffle formed from a 6 inch diameter pipe and centrally located in the draft tube. Clear windows were installed in the filter medial vessel in order to observe backwash efficiency. Visual results of the pilot test confirmed that the draft tube with a baffle provided adequate backwash for the 4 ft large diameter vessel.

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Abstract

The present invention relates generally to a system and method for treating wastewater in a filter media apparatus having a draft tube system. The filter media may be walnut shell media.

Description

RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application Ser. No. 61 / 099,604, titled “PULESD BACKWASH FOR WALNUT SHELL FILTER,” filed on Sep. 24, 2008; and U.S. Provisional Application Ser. No. 61 / 099,608, titled “PULSED AIR WALNUT SHELL FILTER,” filed on Sep. 24, 2008; and U.S. Provisional Application Ser. No. 61 / 099.597, titled “WALNUT SHELL FILTER PROCESS,” filed on Sep. 24, 2008; and U.S. Provisional Application Ser. No. 61 / 165,579, titled “TUBE DESIGN AND PROCEDURE FOR WALNUT SHELL FILTER,” filed on May 5, 2009, each of which are incorporated by reference in their entireties for all purposes.BACKGROUND OF INVENTION[0002]1. Field of Invention[0003]The present invention relates to a system and method for treating wastewater, and more particularly to a wastewater treatment system and method utilizing a walnut shell filter media.[0004]2. Discussion of Related Art[0005]Walnut shell filter media is known for its affinity for b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D24/46B01D24/00
CPCC02F1/004C02F1/286C02F1/40C02F2101/32C02F2209/005B01D24/4884C02F2301/024C02F2303/16B01D24/005B01D24/4636C02F2209/44B01D24/007B01D24/18B01D24/4631B01D24/48C02F1/001C02F2301/08B01D24/00
Inventor FELCH, CHAD L.HOWDESHELL, MICHAELLORGE, ERIC A.KUMFER, BRYAN J.MUNSON, STUART J.PATTERSON, MATTHEW
Owner SIEMENS ENERGY INC