Articles & Case Studies

Storming performance from IWJS

Posted: Thursday 19th July 2012

When storm overflow tanks at Basildon Sewer Treatment Works needed cleaning, Industrial Water Jetting Systems Limited was the first choice contractor to carry out the campaign.

The three large open tanks are designed to store overflow waste when sudden inputs that occur during heavy rain fall exceed the plants’ processing capacity. Each tank is 56 m long and capable of holding 1.5 million litres of sewage.

The storm tanks had not been fully drained and cleaned for 15 years and high levels of silt, rag and grease had built up.

Each phase of the operation required one tank to be drained and then jetted to remove all the debris. Due to the scale IWJS required five days to complete the work for each tank.

As the site continued to be operational, planning was critical to the success of the job. All health and safety concerns had to be addressed prior to commencement including the hourly monitoring of local weather conditions.

The IWJS Colchester depot provided four major pieces of equipment and six experienced operators to ensure smooth continuous processing of the waste.

The first task was to pump the waste water from the tanks using an IWJS recycling unit. Once the majority of the water had been removed the jetting operation could begin to dislodge the accumulated solids from the tank. In places these solids were almost a metre thick.

The waste was fed into one of IWJS’s dedicated screening units to remove the solids. The screened waste was then pumped from the screening unit into a tanker for ferrying to another part of the works ready for the normal treatment process.

The IWJS operators left each of the three tanks in an ‘as new’ condition much to the delight of the works management team. Paul Ellis of LES Engineering says “Again IWJS have delivered a very high level of service within very tight time restraints using some of the best plant and operators available within the waste water cleaning industry”

Tim Day, IWJS’s Southern Senior Manager was responsible for managing the project. “Everything went to plan. We knew the tanks were in a poor state. Our experience counted to ensure the right equipment and staff was used to the best effect whilst also making sure the impact of the works being carried out didn’t jeopardise the normal day to day treatment process in anyway”

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