View Cart (0 items)

Ask the Wastewater Expert

ARTICLES

What is Solids Separation Process Controls in Primary Wastewater Treatment?

Solids -- including those suspended, settle-able and floatable -- are non-liquid or fluid substances that are separated from clarified wastewater in primary treatment.
Read More

In primary treatment, what are the pH process controls for treating wastewater?

The measure of free hydrogen activity in water -- called “pH” for “potential for hydrogen” -- is undoubtedly the most important and most-used wastewater treatment measure. Dependence on pH as a measure relevant to water quality and its control occurs in practically every phase of water supply and wastewater treatment, including acid-base neutralization, water softening, precipitation, coagulation, disinfection and corrosion control.
Read More

What are process controls for treating wastewater in the textile industry?

The textile industry makes woven fabric from either natural or synthetic fiber. Natural fibers are vegetable, such as cotton, or animal, e.g., wool and silk. Synthetic fibers include rayon, nylon, acrylic, or polyester.
Read More

What are the process controls for treating wastewater in the pulp and paper industry?

Large volumes of wastewater -- with elevated physical solids and organic waste concentrations -- are generated in pulp & paper making. Wastewater treating and discharge, and sludge-waste disposal, all have their challenges.
Read More

What are process controls for treating wastewater in the dairy industry?

Dairy wastewater has a high organic load, requiring biological treatment for permit-compliant discharge. Successful, consistent biological treatment in turn requires stringent controls on primary treated wastewater, preceding dairy-waste biological treatment.
Read More

Activated-sludge troubleshooting guidelines

Someone recently asked, “What are some troubleshooting guidelines or procedures for overall process control of activated sludge?”
Someone recently asked, “What are some troubleshooting guidelines or procedures for overall process control of activated sludge?”
Read More

Procedures for overall process control of activated sludge

To control activated sludge, you need to “have a handle” either on aeration, sludge-wasting or return-sludge flow. Aeration-rate adjustment is probably the simplest way to go, says Wastewater Dan. But he briefly reviews all three methods in today’s blog.
Read More

How sludge settles is a key performance indicator

Someone recently asked, 'What are some procedures for measuring settle-ability of activated sludge?'
Collecting samples, use of equipment for simulating settle-ability and the interpretation of results are all part of measuring activated-sludge settle-ability.
Read More

For a firm grasp of trends, monitor wastewater treatment ‘look and feel’

Someone asks, 'What are the parameters relevant to visual and olfactory observation of activated sludge?'
Activated sludge is a biological wastewater treatment that speeds waste decomposition. It is added to wastewater and the mixture, referred to as “mixed liquor,” is aerated and agitated. Subsequently held in a tank, the mixture settles out by sedimentation and is disposed of, i.e., as they say, “wasted,” or returned to the aeration tank as needed. The remaining wastewater then undergoes further treatment.
Read More

Getting back to basics: What is pH?

The most used measure in wastewater treatment, and for good reasons
The “potential of hydrogen” or “pH” is the measure of free hydrogen activity in water and thereby indicative of the measure of its free acidity or free alkalinity. Gauged on a numeric scale of 0-14, solutions with a pH of less than 7.0 are acids. Solutions with a pH greater than 7.0 are bases and solutions with a pH of 7.0 are neutral.
Read More