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Actual vs. Wahlberg-Predicted RAS TSS

Best Books

Rules of Thumb (ROT)

Testing Equipment


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December 30, 2019


This post contains two sections with section 1 covering wastewater solids production and section 2 describing influent wastewater characteristics.

Section 1: Wastewater Solids

It can be helpful to quickly estimate solids production in wastewater. Certainly, each wastewater treatment plant and its collection system, with vari...

Bits and Pieces of Information

When I come across information related to water and wastewater topics, information that I'm not yet prepared to comment on in detail, I post it here. Some of this information I post because I know I will need to come back to it when I'm at a wastewater plant doing work. My hope is that the...

July 30, 2019

Recommended Wastewater Treatment Textbooks

I get asked now and then what the best books are for learning more about wastewater treatment. There are many, many excellent technical references available but here I want to highlight just those that I find myself coming back to most often. My work brings me into both industrial and municipa...

January 21, 2019

Some Simple Guides

This page provides some tips and insights I've come across. A search on Google for “Rule of Thumb” leads to the following definition:

“A broadly accurate guide or principle, based on experience or practice rather than theory.”

Best Wastewater Treatment Option

Here is a favorite, very handy, ROT, quoted from the excellen...

November 18, 2017

With links to (valuable and informative!?!) portable document format (PDF) files scattered all over this website I thought it might be helpful to consolidate those documents in one place. Therefore, what you will find here will be links to the documents referenced in the blog pages. You won't find all of the d...

July 10, 2017

In former days, when I did a lot of polymer-focused jar testing, I had three products in my polymer test kit that I never fully understood. The products themselves were straightforward enough as they were PACls or polyaluminum chloride coagulants. Where my understanding stalled out was the additional description of these products in t...

May 1, 2017

Composition of a Bacterial Cell

There are two formulas used to describe a bacterial cell. Both are discussed below.

The most widely used empirical formula for the organic fraction of bacteria cells is shown below. About 53 percent by weight of the organic fraction is carbon.

A more complete formula for the composition of a bacteria cell...

October 9, 2016

The Water We Use

As I travel from one place to another I seldom give much thought to the water I drink, cook with, and bathe in. But there are occasions when something seems a little "off" with the water. Sometimes it's the taste, a hint of hydrogen sulfide, which makes for a very bad cup of coffee, or perhaps the water just seems to b...

October 8, 2016

pH and Alkalinity Relationships

The following two graphics are intended to provide a handy reference describing pH and alkalinity relationships. Clicking on either of the images will open up a high quality PDF file that you can download and print. The source of this information is the excellent textbook from Nalco with the full referen...

September 29, 2016

Informative EPA Fact Sheets

The United States Environmental Protection Agency (EPA) does an excellent job of assembling and posting relatively short, highly informative, readable, technical documents they refer to as Technology Fact Sheets.

As I come across these documents I'll post them here. They are PDF files that quickly get to the...

September 29, 2016

Wastewater Standards

These well-known and reliable wastewater standards have changed slowly over the years, getting updates as needed to stay current, while continuing to maintain a clear, user-friendly, technical presentation of key wastewater guidelines.

You can download this handy reference document as a PDF file here.

September 5, 2016

Activated Sludge Design Parameters

This is a handy chart from the well-known Metcalf & Eddy handbook (Metcalf & Eddy. Wastewater Engineering: Treatment and Reuse. 4th ed. Boston: McGraw-Hill, 2003).

Clicking on the image will open up a PDF version of the chart for printing or to give you a larger view.

August 10, 2016

Much to My Dismay!

I am a strong advocate for the use and value of oxygen uptake rate (OUR) testing. I find this simple procedure to be so insightful when it comes to evaluating a biological treatment system. What always surprises me as I travel throughout the United States, as well as internationally, is how seldom OUR testing is perf...

July 3, 2016

Join the IWA

The International Water Association (IWA) is a water/wastewater organization I highly recommend you join. As a member you have access to a wide range of excellent textbooks at discounted pricing. I've purchased many books from the IWA. In addition, they have numerous technical publications/magazines that you get online acc...

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