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Dunedin City Council – Kaunihera-a-rohe o Otepoti

Trade wastewater is not necessarily toxic but can be harmful if it is not managed properly. The Council manages Trade Waste via the Dunedin City Council Trade Waste Bylaw.

Under the Bylaw relevant Trade Waste dischargers are required to obtain a Trade Waste consent. The Bylaw sets limits for substances for acceptable for discharge and also lists prohibited substances. The Bylaw and related Guidelines are available from the related information section.

The Council recovers some drainage rate costs via Trade Waste charges. Trade Waste charging information can be found in the related information section.

Grease traps and your food business

Fats, oils and greases (FOGs) are an essential part of almost all food businesses. They are used as ingredients and for cooking purposes. FOG residues are also left on plates and cooking utensils which, when cleaned, transfer into the waste water (sewer) system.

Proper disposal of FOG's is important, otherwise problems will be experienced later on as fats solidify and block sewers. This can occur at any point on its way to the Waste Water Treatment Plant (WWTP), including at the plant itself, resulting in a lower quality of waste water treatment.

To prevent blockages and WWTP problems, the Dunedin City Council requires all food businesses/premises engaged in the cooking, preparation or sale of food (e.g: restaurants, takeaways, hospitals, hotels, bakeries, butcheries and supermarkets) to install and regularly maintain a system that removes FOGs from the waste water discharged from that business.

Grease traps are one type of system. There are 3 types of grease trap: passive grease traps, grease converters and mechanical grease separators.

If your business or premise is engaged in the cooking, preparation or sale of food you must obtain a Trade Waste consent from the Dunedin City Council before you discharge your wastewater to the sewer. This consent establishes the conditions under which food outlets and services can discharge waste to the sewer.

To apply for a Trade Waste consent use the application form in the related information section and return to the Dunedin City Council Trade Waste Officer, who will contact you on receipt of the application form and if further information is required. Garbage grinders or macerators shall not be used to dispose of solid waste from trade premises to the sewage system unless approved by the Council as a Conditional Trade Waste consent. Fees are applicable for Trade Waste Consent Applications and a Building Consent will be required for new grease traps or modifications to existing ones.

The brochure, Waste Fats and Oils and your food business, explains the different types of grease traps available, and can be downloaded from the related information section.

There are three categories of trade waste customer:

Category A

Dischargers of trade waste whose flows and contaminant loads exceed the baseline limits set out in the Bylaw (either after or without pre-treatment). Category A customers will require a trade waste consent and will be subject to monthly trade waste charges.

Category B

Dischargers of trade waste whose flows and contaminant loads are below the baseline limits set out in the Bylaw only after effective pre-treatment. Category B customers will require a trade waste consent may be subject to an annual inspection fee.

Category C

Dischargers of trade waste whose flows and loads are below the baseline limits set out in the Bylaw without requiring pre-treatment. Category C customers will not require a trade waste consent and will not be subject to any trade waste charges or annual inspection fees.

For more information, contact the Dunedin City Council Trade Waste Officer.

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