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Spiral mixer for floc conditioning

A technology of spiral mixing and flocculation, which is applied in the direction of flocculation/sedimentation water/sewage treatment, water/sewage treatment, water treatment parameter control, etc., and can solve problems such as ineffectiveness

Inactive Publication Date: 2010-12-22
PALO ALTO RES CENT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-kinetic aggregation (shear-driven) is much faster, especially for larger aggregates, but less efficient due to large size and need to engineer convective flow patterns

Method used

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  • Spiral mixer for floc conditioning
  • Spiral mixer for floc conditioning
  • Spiral mixer for floc conditioning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The presently described embodiments relate to systems and methods for performing helical mixing and helical separation procedures. Spiral mixers include means for the well-controlled continuous dosing of flocculants (and other known chemicals used in water treatment) into a source water stream just prior to the spiral device. The relatively narrow confines of the helical channels combined with the turbulent flow conditions allow for a very rapid distribution of the added chemicals, thus providing an environment for the nucleation of very uniform primary aggregates. Further aggregation of these primary aggregates within the channel is restricted to dense and compact aggregates due to the (controlled) high shear rate within the confined space of the channel. These floe particles aggregated to a uniform size are then mobile and easily separated without downstream sedimentation. Separation can be achieved using a helical separator in direct fluid contact with the helical m...

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Abstract

A system and method for treatment of water. An inlet is operative to receive source water having particles therein. A spiral mixer has a defined spiral channel operative to mix the source water with a coagulant material and an alkalinity material. The spiral mixer is formed to perform in-line coagulation and flocculation processes within the defined spiral channel to form aggregated floc particles. A buffer tank is operative to receive the aggregated floc particles from the spiral mixer. Spiral separator segregates contents of the buffer tank into affluent and waste water that has the aggregated floc particles therein. An outlet is operative to provide a first path for the affluent, and a second path for the waste water having the aggregated floc particles.

Description

Background technique [0001] The core elements of conventional water treatment include the sequential process steps of coagulation, flocculation, sedimentation and physical filtration. These process steps require corresponding physical structures such as coagulation and flocculation tanks in which the individual process parts take place. Typically, chemical flocculants are used to remove Coulomb repulsion (ie, neutralize the charge) and to facilitate aggregation of submicron particles into needle flocs. The time required for aggregation (ie, aggregation time) is determined by several parameters, including the concentration and size of the aggregates. [0002] A flocculant in the form of long chain polymers can then be added to anchor the flocs to form larger entities that settle more quickly in the settling tank. Depending on input water quality and equipment, the hydraulic retention time through the first 3 stages can be 5-10 hours and requires significant physical footprint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/66C02F9/00C02F2209/44C02F1/38C02F1/5281C02F1/52
Inventor M·H·利恩A·R·富尔克尔A·科尔J·索N·佩里克
Owner PALO ALTO RES CENT INC