White Water Circulation Loops

SKU: C-649Duration: 10 Minutes

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Language:  English

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Course Details

Specs

Training Time: 10 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

The collection and reuse of white water in paper and board making processes reduces fresh water usage, sewer losses and loads, and energy usage. The primary white water circulation loop, or short circulation loop, quickly returns white water removed from the stock on the former to the thin stock system and headbox. The secondary white water loop, or long circulation loop, collects the excess white water, clarifies it, and supplies dilution, shower, and make-down water back to the process. This module will identify and describe the components and main functions of the primary and secondary white water circulation loops.

Learning Objectives

  • Define the terms "white water" and "closed system"
  • Describe the benefits of collecting and reusing white water in paper and board production processes
  • Identify the components and two main functions of the primary white water circulation loop
  • Identify and describe the components of the secondary white water circulation loop
  • Identify the uses of secondary white water
  • Identify and describe the primary process flows

Key Questions

The following key questions are answered in this module:

What are the benefits of reusing white water?
Reuse of white water reduces the fresh water usage, sewer loads and losses, and energy usage.

What is the purpose of the short circulation loop?
To dilute the stock to the desired headbox consistency and to prevent foam and entrained air from entering the thin stock system.

Where is white water added to thick stock?
The primary cleaner pump or fan pump receives the thick stock flow, plus dilution white water from the silo, and pumps the resulting mixture through the thin stock system.

How is white water in the long (secondary) loop clarified?
The white water in the long circulation loop is typically clarified by a disc saveall, drum saveall, or dissolved air flotation (DAF) unit to separate the fibers and fines from the water.

What is secondary white water used for?
Clarified white water in the secondary circulation loop is typically used as machine shower water, dilution water for consistency control to various stock pumps, dilution and sluicing water to pulpers, and make-down water for chemical systems

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

White water is the drainage water from stock or furnish on a paper or board machine. White water contains valuable fiber, fines, residual chemicals, and heat, and it is not always white. White water takes on the color of the fibers and fines that it contains. White water systems are designed to recover these valuable resources for reuse in the paper or board making process. White water systems are usually closed, which means that the same water is used over and over again. These systems collect the white water from the machine, filter out and recover reusable fibers and fines and then supply sufficient quantities and qualities of white water back to the process. This helps minimize fresh water usage and affluent flows.
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