Rules of Thumb (ROT)

Actual vs. Wahlberg-Predicted RAS TSS

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July 16, 2020

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 variable ratios...

May 25, 2020

Introduction

Hydrogen peroxide can be used to increase the dissolved oxygen (DO) concentration in an aerobic bioreactor, often referred to as “DO supplementation.” Using peroxide is rarely a first choice because chemically increasing DO is more expensive than using a mechanical method (diffused aeration, mechanical mixing, etc.). But i...

May 10, 2020

The organic strength of wastewater is measured in three ways: 1) as 5-day biochemical oxygen demand (BOD5), 2) chemical oxygen demand (COD), and/or 3) total organic carbon. Typically, municipal wastewater treatment plants will use BOD5 as a measure of the organic concentration into, and through, the wastewater plant. Industrial wastew...

May 10, 2020

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 Based on Organic Concentration

Here is a favorite, very handy...

February 11, 2019

The following is quoted from W. Wesley Eckenfelder, Jr. in his excellent textbook “Industrial Water Pollution Control”, Third Edition, 2000.

Waste Characteristics—Estimating the Organic Content

Although the interpretation of most of the waste characteristics is straightforward and definitive, special consideration must be given to the o...

May 1, 2017

Testing Equipment for Water, Reverse Osmosis, and Wastewater

There are several "sets" of laboratory equipment that are critical for evaluating water (including reverse osmosis) and wastewater treatment systems. One set is for doing oxygen uptake rate (OUR) analysis in wastewater systems. Another set is for conducting adenosine triphosp...

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