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Belt press apparatus and method for high solids capture and high solids content

a belt press and solids technology, applied in the direction of filtration separation, multi-stage water/sewage treatment, separation process, etc., can solve the problems of high operating cost, low percentage of incoming solids to the belt press retained in the filter cake, and all prior art, so as to increase the flow of the mixture of solids and increase the compression in the wedge zone

Inactive Publication Date: 2008-05-15
B&T TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]In a further preferred embodiment, each of the four adjustable separators at the four corners of the rectangular upper belt assembly may inco...

Problems solved by technology

There are two problems with all prior art.
First, many applications require higher % solids in the dried cake than can be produced using prior art.
Some landfills refuse to accept sewage sludges that do not pass a minimum % solids content or stickiness test, requiring municipalities to add drying sand beds or find more costly land spreading options for sludge disposal.
Dewatered livestock manures require addition of bulking agents before composting because moisture content of dewatered sludge is too high.
Ethanol processors incur higher operating expense when the moisture of wet distillers' grains from processing whole stillage is too high.
Second, the percentage of incoming solids to the belt press retained in the filter cake is too low.

Method used

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  • Belt press apparatus and method for high solids capture and high solids content
  • Belt press apparatus and method for high solids capture and high solids content
  • Belt press apparatus and method for high solids capture and high solids content

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Embodiment Construction

[0036]The subject of the invention is a belt press (10) for the separation of a mixture of solids and liquids (2) into a filter cake with high solids content and a means for retaining a high percentage of incoming solids in the filter cake so as to produce a separated liquid filtrate with as few solids as possible. Referring to FIG. 1, the belt press includes an upper belt assembly (3) with an endless non-permeable upper belt (4); a lower belt assembly (5) with an endless permeable lower belt (6); a gravity screening zone (7); and a wedge zone (8). In the gravity screening zone, liquid is allowed to drain through the lower permeable belt without pressure being applied by the upper belt. The wedge zone follows the gravity screening zone wherein the spacing between the two belts becomes increasingly narrow, causing pressure applied by the upper belt to increase as the spacing between the belts decreases.

[0037]The upper belt is supported by a discharge-end roller and drive (9) and an i...

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Abstract

A belt press solid / liquid separation apparatus is provided for separating organic mixtures with substantial amounts of moisture to produce separated solids with solids content of 50-90% while retaining 99% of the incoming solids in the filter cake. Specifically, the invention incorporates a double-belt press apparatus with a non-permeable upper belt, a highly permeable lower belt, a wedge type zone with adjustable spring compression, and a means for re-screening belt press filtrate with either a single belt press or multiple belt presses configured as a multi-step cascade of belt presses.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of solids / liquid separation of organic mixtures with substantial amounts of moisture, e.g. livestock manures, food waste, whole stillage from ethanol processing or beer manufacturing, municipal wastewater sludge or other organic sludges and slurries. More particularly, the invention relates to a belt press design for thickening and dewatering mixtures to produce separated solids with solids content of 50%-90% while retaining 99% of the incoming solids in the filter cake.BACKGROUND OF THE INVENTION[0002]Various methods are known for removing liquid from mixtures of solids and liquid. In cases where solids consist primarily of compressible granular, fibrous or cellular material and the liquid is water, equipment selected for these applications have included belt presses, centrifuges, screw presses and vacuum filters.[0003]There are technical and economic reasons for selecting a particular technology. Technical reas...

Claims

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Application Information

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IPC IPC(8): B01D33/04
CPCB01D33/04B01D33/41B01D33/642
Inventor MOSS, WILLIAM H.
Owner B&T TECH
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