Cornish Orchards Cider protects cherished environment with a new Nijhuis wastewater treatment plant
Cornish Orchards create award winning premium ciders located deep in the Cornish countryside. As a company with proud environmental standards they were keen to commission a treatment plant based upon smart and sustainable principles, all realised on small footprint. Nijhuis Industries responded to this challenge by designing a Sequential Batch Reactor (BIOCTOR-SBR) system, as part of a turnkey design and build solution.
The new wastewater treatment process is a robust and reliable solution, protecting the cherished environment. The client has received operational training and is proud to be operating a fully functioning Nijhuis effluent treatment plant with the confidence that a robust and reliable process is protecting the cherished environment.
The Nijhuis solution: from cost to sustainable water use
The solution comprises of the pumping of effluent from an existing wet well to an NRF 38/050 rotating screen with scraper to remove bottle caps, labels and other large obstructions. This feeds into a NDF 200 cloth screen incorporating polymer dosing to remove high levels of total suspended solids such as pumice from apple pressing. The screened effluent is then introduced to a Nijhuis BIOCTOR-SBR tank via a selector tank.
A solid biological treatment process: sequence batch reactor
The Nijhuis BIOCTOR-SBR process is a single batch bio treater comprising a 465m2 tank with floating aerator and decanting arm. The biomass within the tank converts organic matter to water, carbon dioxide and new biomass with the aid of oxygen induced by the aerator. Oxygen levels are monitored and controlled by an in-line probe. The excess sludge from the BIOCTOR-SBR tank is fed back to the cloth screen to thicken the sludge and thereafter to a sludge storage tank.
Reduced visual impact of the plant
The Nijhuis BIOCTOR-SBR tank and associated equipment, pumps and transfer tanks were designed to be accommodated within a cast in-situ reinforced concrete bunded area. This reduced the visual impact of the plant which is set within a 16th century farm. The difference in level between the lower bunded area and the upper slab allowed gravitational flow from the screens situated at the upper level. The whole process is controlled by the Nijhuis PLC electrical control panel housed in a bespoke control room, which also provides housing for chemical/polymer dosing and sampling facilities.
Smart adapted lagoons to provide buffering capacity
Treated effluent is pumped 75m up to the client’s existing old treatment lagoons. These lagoons were adapted to provide buffering capacity of batched effluent by the inclusion of a hydro brake to limit flows to the maximum discharge consent specified by the Environment Agency. Flows from the hydro brake are fed via a 200m sewer to discharge into the local stream.
Client benefits / Nijhuis impact
- Reduced discharge cost
- A robust and reliable SequentialBatch Reactor process
- A wastewater treatment plantrealised on a small footprint.
- Protecting the cherished environment