Student Site Visit – Coventry Energy from Waste Plant

On the 26^th March 2014 a group of undergraduate and post graduate students visited the Coventry & Solihull Waste Disposal Company (CSWDC). CSWDC is an independent waste management company whose main business is extracting energy from municipal and commercial solid waste. The energy from waste (EfW) plant is based to the south of the City (Coventry) and has been operational since the 1970s. The 250,000 tonnes per annum facility produces electricity (used for powering site operation and export to the national grid) and exports excess heat energy (heated water) to business premises off-site.

During the tour of the site

Mick Schilling (CSWDC’s Environment, Health and Safety Advisor) provided an overview of the EfW plant operation prior to a tour of the site. The 3,500 tonne bunker that receives the waste in the waste vehicle tipping area would be able to sustain operation of the site for six days (from the bunker being full until empty). The EfW plant uses three incinerator units each of which is capable of incinerating 12 tonnes of waste per hour. Two steam turbines produce a total of 17.6 Mw of electricity. Flue gas cleaning ensures strict emissions limits are met. Emissions to atmosphere are through a 92 m high chimney.

Site visits provide students with the opportunity to discuss a variety of wastes management treatment processes directly with facility operators. This enhances knowledge and understanding for all those that attending, providing further areas for discussion in lectures. 

Student Site Visit – Fernbrook Bio Anaerobic Digestion Plant

On 12^th March 2014 students studying environmental science and environmental management courses at the University of Northampton visited the Fernbrook Bio anaerobic digestion (AD) plant at Rothwell in Northamptonshire. The tour of the 30,000 tonne per annum facility was led by Shaun Cherry (Managing Director) and Naz Ladumor (Technical Manager). The visit gave students the opportunity to view a commercial facility in full operation.

The AD plant treats biodegradable waste, which includes food waste collected from households in Northampton and Daventry. The by-products of the AD process are a methane rich biogas and nutrient rich digestate. The biogas is sent to a gas turbine to generate green renewable electricity sufficient to power 2000 homes. AD is currently the best system for recovering energy from food waste. The pasteurised digestate (organic fertiliser), which contains nitrogen, phosphate and potassium can be applied to farmland. Highlights of the tour were the on-site laboratory where samples from the process are analysed to show compliance with relevant permits. Students also viewed the inside of one of the large sealed digester reaction vessels through a viewing window. The biogas could clearly be seen bubbling off the top of the pulverised feedstock (food waste mixed with slurry).

This is one of a number of site visits that allow students to see processes discussed in lectures in the real world. It is also an opportunity for interaction and questioning of facility operators enhancing knowledge and understanding for all those that attended.