News & Opinion
Photograph of a WWTP operator cleaning accumulated grit

The Cost Of Grit - the seven questions that WWTPs should be asking

Finding accurate evidence of the true cost of grit to a wastewater treatment plant may be a challenge for WWTP operators – especially when justifying the installation of more advanced removal...

11 March 2016

Case study
A sewage digester at the St Bernard Parish WWTP, Louisiana

Reduced energy cost, increased capacity - St Bernard, Louisiana

The problem: a damaged, underperforming plant Meraux, Louisiana is located near New Orleans in St Bernard Parish, an area hard hit by hurricane Katrina in 2005. Excessive damage to the Parish's...

17 February 2016

Case study
Chart showing the typical cost to a wastewater treatment plant incurred per year due to grit missed by an aerated grit basin

Calculating the Cost Of Grit - Aerated Grit Basin

As much as 60% of grit is being missed Research conducted by Hydro International suggests that, on average, 60% of all grit is being missed by conventional grit removal systems. This grit passes...

29 January 2016

News & Opinion

The Cost Of Grit - Q&A with Keith Hutchings

Q. Is grit a significant factor in the cost of running a Wastewater Treatment Plant (WWTP)? If so, how? A. The abrasive nature of grit has long been recognised as a major factor causing wear and...

22 December 2015

News & Opinion
Settled grit clogs wastewater treatment processes

Technically Speaking: Grit Removal

Grit entering the process stream of a wastewater treatment works has always posed a threat by raising operating costs and impacting on energy efficiency. But the heavy burden in energy, materials,...

16 December 2015

News & Opinion
Accumulated grit - TOTEX must take into account lifetime maintenance costs

TOTEX - Balancing Risk & Reward

Getting the right balance between risk and reward is a critical success factor for any business, but for UK water companies those cash prizes and penalties are driven by a regulator, through their...

14 December 2015

Case study
HeadCell units at Council Bluffs Water Pollution Control Plant, Iowa

Improved fine loess sand removal - Council Bluffs, Iowa

A successful project at the Council Bluffs Water Pollution Control Plant, Iowa, replaced an outdated aerated grit basin to improve fine loess sand removal and reduce digester cleaning in the...

9 December 2015

News & Opinion
A typical aerated grit basin

Intermittent operation - an irresistible attraction?

Operating wastewater treatment plant processes or equipment intermittently offers the irresistible attraction of reduced energy costs. But take the practice too far, or in the wrong circumstances,...

2 December 2015

Case study
Teaser image

Big Sandy River, Kentucky

With a name like the “Big Sandy River”, it’s no surprise that extracting water for drinking presents challenges for treatment plant operators. Two treatment plants situated along this...

30 November 2015

Technical paper

Advanced Sludge Degritting - A Cost-Effective Solution to Abrasives Removal

Wastewater treatment plants are significantly impacted by grit, and the majority of installed grit removal systems fail to keep settleable grit out of the plant. Grit is a nuisance material,...

17 November 2015

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