Rule 8 Small scale production and collection of biogas
Small scale production and collection (including the refining, purification, and reforming) of biogas and the storage, transfer, and small scale flaring of hydrocarbons and biogas)
The discharge of contaminants into air from industrial or trade premises in connection with any:
(1) process involving the production and collection (including refining, purification, and reforming) of biogas produced by the anaerobic fermentation of waste at a rate less than 10 m per day;
(2) flaring of hydrocarbons and biogas at a combined rate of less than 2 MW; and/or
(3) storage or transfer of hydrocarbons and biogas;
is a Permitted Activity, provided it complies with the conditions below.
The person(s) responsible for the activity shall ensure that:
(i)there is no discharge of particulates of a concentration greater than 250 mg/m(at STP), measured at the point of discharge;
(ii)there is no smoke, dust or odour from the discharge which is offensive or objectionable at or beyond the boundary of the premises or property;
(iii)processes discharging contaminants to air noted in sections (1) and (2) above, discharge through a chimney(s) which terminate at least 3 metres above the level of any adjacent area to which there is general access;
(iv)ventilation pipes and storage tank pipes are designed to ensure the unimpeded vertical discharge of vapours displaced during transfer of liquids or during normal tank breathing; and
(v)there is no naked flame from flares visible at or beyond the boundary of the premises.
Explanation: Rule 8 permits the discharge of contaminants to air in relation to the small scale production, storage, transfer, and small scale flaring of hydrocarbons and biogas, subject to the stated conditions. Rule 8 relates to discharges from industrial and trade premises only. It permits the discharge of contaminants to air from all activities described in (1)-(3). The actual production of hydrocarbons, including the refining, purification, and reforming of hydrocarbons and any other hydrocarbon and biogas processing not covered in (1)-(3), and where undertaken on a industrial and trade premises, is a discretionary activity requiring resource consent.
All other discharges relating to the processing or handling of hydrocarbons or biogas on industrial or trade premises are discretionary activities under Rule 23. Therefore, the refining, purification, and reforming of hydrocarbons, other than biogas at rates of more than 10 m per day, is a discretionary activity covered by Rule 23. Similarly, the flaring of hydrocarbons and biogas at rates equal to or greater than 2MW is a discretionary activity, also covered by Rule 23.
The conditions in Rule 8 require that there is no discharge of particulates of a concentration greater than 250 mg/m (at STP) measured at the point of discharge, and that there are no offensive or objectionable discharges. Conditions (iii) and (iv) are aimed at ensuring against fugitive emissions and minimising the adverse effects from downwash. These conditions also have the added benefit of enabling greater ease of monitoring discharges. Condition (v) requires that there be no naked flame visible at or beyond the boundary of the premises. Flames from flares must be shielded. Unshielded flares will require a discretionary resource consent, under Rule 23. Flaring involves burning off combustible gases which would otherwise pose a safety hazard.