Residual Waste Treatment Service
From Waste Treatment
The New Earth process for the treatment of residual waste utilises mechanical biological treatment (MBT) to help assist in meeting local and national landfill diversion and recycling targets. In the mechanical stage the waste is liberated and separated so elements such as plastics and metals can be extracted for recycling, a refuse-derived fuel (RDF) is produced for use in renewable energy schemes and the organic part of waste is removed for onward processing.
In the biological stage that organic waste is composted in a controlled environment to produce a useful land remediation, compost-like, product called nutri-9.
New Earth’s facilities at Avonmouth in Bristol, Cotesbach in Leicestershire and Canford in Dorset all utilise MBT technology and processes. These three facilities have a combined processing capacity of 325k tonnes treatment per year and treat waste from both local authority and commercial customers.
New Earth’s mechanical biological treatment (MBT) facilities incorporate a waste sorting capability to separate the incoming mixed residual wastes into different fractions for further treatment or recovery. Separation of the different fractions is achieved by the use of shredding, particle size screening, ballistic and air separation technology, near-infra red optical recognition, magnets and eddy-current separators.
Recyclables in the form of ferrous and non-ferrous metals and polymers of rigid plastics are recovered at different stages in the process.
A fine material fraction is first separated from the mixed waste using a vibrating screen. The organic-rich fine fraction is transferred to the bio-stabilisation halls for biological treatment, where it is aerobically composted under carefully controlled and continuously monitored conditions over a period of up to six weeks.
Conditions to optimise biological degradation in the enclosed bio-stabilisation halls are maintained through agitation (or turning), ventilation and irrigation. This achieves process losses and produces a stabilised material that yields a compost-like-output, or CLO, which we call nutri-9.
The CLO is screened from the stabilised material so as to remove contrary and reject matter. It can then be sanitised through a pasteurisation process in order to comply with the Animal By-Products Regulations (ABPR), before being utilised beneficially in landfill restoration for non-food soil conditioning applications. CLO applied to land in this way qualifies as recycling for local authorities’ performance indicators and New Earth’s MBT customers benefit accordingly by counting this towards their overall recycling performance.
Waste that is not suitable for bio-stabilisation treatment or recycling can be used for renewable energy recovery through the creation of refuse-derived, biomass-rich fuel.
The New Earth MBT process is flexible and can be tuned and adapted to take account of incoming waste composition and the availability of markets and outlets for recovered fractions.
New Earth is continuously monitoring available recycling markets and, as new recycling technology is developed, looks to take advantage of the markets accessible for its outputs.