wastewater treatment

This category contains 11 posts

Controlling the Water Industry – Sludge IV – Its all about the product

This last blog in sludge management will attempt to sum up what the other three blogs have already said and add a little bit more, looking at sludge management from a holistic point of view. So what is sludge all about, it used to be how we dispose of the waste products from the wastewater … Continue reading

Controlling the Water Industry – Sludge III – Bubble, Bubble, toil and trouble!

As promised in the last blog the subject that is being discussed this week is sludge digestion and some of the more simplified control systems and instrumentation surrounding this area and the possibilities that exist. Sludge digestion is probably one of the most common ways of dealing with sludge, getting a quality product from waste … Continue reading

Controlling the Water Industry – Sludge II – How thick do you want it?

In this week’s blog Oliver Grievson looks at the most basic process of sludge treatment outside what is done on sites in settlement tanks or sludge tanks. He is of course thinking about mechanical thickening or dewatering, and will of course exclude picket fence thickening (it has its place but not in this blog). When … Continue reading

Controlling the Water Industry – Sludge I – All that sludge…but how much do we actually have?

It’s a fact the water industry whether it be in drinking water treatment or in wastewater treatment produces a lot of sludge. A quick look through the Internet will give you a ball park estimate but to save you the time it is about 1.4 million dry tonnes in the UK and about 7 million … Continue reading

Controlling the Water Industry – Activated Sludge Part IV – Whoops! Where did all those solids go?

In this last post on Activated Sludge Oliver Grievson is going to talk about what can be done within the process that can protect the overall permit of the treatment works and attempt to sum up what he has  said so far. As we all know of all the process that are used in wastewater … Continue reading

Controlling the Water Industry – Activated Sludge Part III – The solids in the plant go round and round

In the third post of this blog series on the problems associated within the activated sludge process and how to control them Oliver Grievson is going to look at the Return Activated Sludge system. So what problems are seen and how can they be fixed? A particular one that I have seen and this especially … Continue reading

Controlling the Water Industry – Activated Sludge Part I – Solids, Solids and more solids

To start off this series this series of blogs is going to look at a basic nitrifying activated sludge plant it will not look at activated sludge plants that are designed to remove nutrients although some of the principles will be the same. As a general rule the problem with the operation of the activated … Continue reading

Resistance to the Effective Use of Instrumentation V: So what can an instrument achieve?

In the continuation of the blog on the resistance to the effective use of instrumentation Oliver Grievson, manager of the Water Industry Process Automation and Control (WIPAC) group on LinkedIn, is going to examine what an instrument and more importantly what an instrumentation system can achieve. In this analysis I can going to make a … Continue reading

Part 3: How can consent failure be predicted before it happens?

Here is the 3rd installment of Alan Bland’s Analysis of the Risk of Consent Failure in UK WWTPs. If you’d like to review the first 2, please follow the corresponding links: Part I, Part II. Please comment and provide feedback so we can better reach your interests as readers of the water quality and security … Continue reading

Part II: What Constitutes Consent Failure?

This is the continuation of the Analysis of the Risk of Consent Failure of UK Wastewater Treatment Plants series from Alan Bland. I hope you enjoy: In the early 1990s, when this project was undertaken, the established sewage treatment works discharge consents were those originally issued under the 1963 Water Resources Act, referred to as WRA … Continue reading

Analysis of the Risk of Consent Failure of UK Wastewater Treatment Plants Part I – The Context

Hi Water Quality and Security Followers, This week we are beginning a new series on the Risk of Consent Failure of UK wastewater treatment plants. I think the topic of risk management as it pertains to new regulations is a cross-border issue and much can be learned from this series. Our guest blogger is Alan … Continue reading