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However, other types of composting systems may be allowed provided they: (i) ensure that there is no access by vermin; (ii) are managed in such a way that all the material in the system achieves the required time and temperature parameters, including, where appropriate, continuous monitoring of the parameters; Page 40 (iii) comply with all other requirements of this Regulation. Each biogas plant and composting plant must have its own laboratory, or make use of an external laboratory. The laboratory must be equipped to carry out the necessary analyses and be approved by the competent authority.

Many pulp and paper producers, for example, burn pulping liquors in large boilers, which generate high-pressure steam that is then passed through a turbine to generate electricity for the pulp mill. The low-pressure exhaust steam is used to heat other parts of the production process. The industry also burns large quantities of wood residue, or hog fuel, in high-pressure steam boilers. The fuel is made from forestry industry residue, mainly bark, that has been ground down. The practice is most common in pulp mills, sawmills, veneer and plywood mills, in which it supplies all or part of the plant’s electricity and heating requirements.

Most of the vessels are linked to avoid the loss of compression energy. So when one vessel is depressurised the linked ones remain pressured. Hydrogen sulphide is removed in activated carbon filters prior to the process; the elemental sulphur it produces is used as a fertiliser. Membrane biogas High-pressure gas separation and gas-liquid absorption are the two techniques used technology here. The former selectively separates hydrogen sulphide or carbon dioxide. This is done in three progressive stages, usually achieving between 92% and 96% purity.

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