Fresh Water Systems

SKU: C-765Duration: 32 Minutes Certificate Included

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Course Details

Specs

Training Time: 32 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Water is used in virtually every step of the pulping and papermaking process. It is used for cooking, bleaching, washing and fiber transport. It is used for steam creation and cooling. This module covers the major sources of mill raw water, the contaminants commonly found in raw water, as well as raw water testing and treatment.

Learning Objectives

At the end of this module, you will be able to:

  • Explain how water is used in a mill
  • List the major sources of mill raw water
  • List the major classes of contaminants in raw water
  • Identify and describe some of the important tests run on raw water
  • List the common major treatment steps for raw water treatment
  • Identify and describe the additional treatment steps required for boiler feedwater
  • Identify and describe the safety hazards and safe work practices associated with fresh/raw water systems

Key Questions

The following key questions are answered in this module:

How is water used in a mill?
Water is used in nearly every step of the pulping and papermaking processes. It's used to cook and bleach fibers; it's used to recover cooking chemicals; it's used to wash fibers; it's used to transport fibers in a slurry; it's used to suspend fibers and distribute them on a machine to create a sheet or board; and it's used for heating and cooling.

What is the molecular structure of water?
Water has a simple molecular structure with the chemical formula H2O. One molecule of water has two hydrogen atoms covalently bonded, at an angle to each other, to a single oxygen atom.

What are two primary sources of industrial water at mills?
Industrial water sources are broadly categorized as either surface water or groundwater.

What are two general classes of impurities found in water?
Suspended solids and dissolved solids.

What are some commonly run tests on water at mills?
Total suspended solids (TPS), turbidity, total dissolved solids (TDS), pH, hardness, biological oxygen demand (BOD), temperature, and temperature.

What are some common water treatment steps?
Screening, clarification, filtration, demineralization, and deaeration.

Sample Video Transcript

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

The first water treatment step is screening. If water comes from a surface source, it is put through a relatively large opening screen or mesh to remove trash, fish, and any other large items that would interfere with further processing. Next, the water is sent to a large clarifier with a long retention time. As the water flows slowly through the clarifier, the larger suspended solids are given a chance to settle out and separate by gravity. Clarifiers usually have a mechanism to slowly and automatically remove settled solids.

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