Schedule 2 - Prohibited characteristics

Section contents

S2.1 Introduction
S2.2 Controlled trade waste

S2.1 Introduction

S2.1.1 A controlled trade waste consent is intended for low volume, low toxicity trade wastes.

S2.1.2 Any one characteristic that exceeds the levels indicated in this Schedule may be cause for control under a conditional trade waste consent. Also, as indicated in Part 3 of this Bylaw, local catchment requirements may also dictate that a low volume, low toxicity waste is covered by a conditional trade waste consent.

S2.2 Controlled trade waste

To be classed as a controlled trade waste under this Bylaw then the nature and levels of the characteristics of any wastewater that is discharged shall comply with the following.

S2.2.1 General description

The discharge shall be characterised by a:

  1. flow not exceeding 5m3per day
  2. instantaneous flow rate not exceeding 2L / s
  3. Biochemical Oxygen Demand (BOD) concentration not exceeding 600g / m3
  4. Suspended Solids (SS) concentration not exceeding 600g / m3.

Notwithstanding the above, a higher flow than 5m3 / day may be accepted provided that the BOD mass does not exceed 3kg / day and the SS mass does not exceed 3kg / day. A higher flow will only be accepted after examination of the local wastewater system situation particularly in relation to the sewer capacity, gradient and the material from which the sewer is made.

S2.2.2 Temperature

The temperature shall not exceed 50°C.

S2.2.3 Solids

  1. Non-faecal gross solids shall have a maximum dimension that shall not exceed 15mm.
  2. The total dissolved solids concentration in any wastewater shall be subject to the approval of the Council having regard to the volume of the waste to be discharged and the suitability of the drainage system and the treatment plant to accept such waste.
  3. No fibrous, woven, or sheet film or any other materials that may adversely interfere with the free flow of wastewater in the wastewater system shall be present.

S2.2.4 Oil and grease

This clause applies to mineral oils, fats and grease used by industry and oils, fats and grease used in food preparation where:

  1. there shall be no free or floating layer
  2. mineral oil and grease shall have a maximum concentration not exceeding 20g / m3
  3. oil and fat used for food preparation shall have a maximum concentration not exceeding 100g / m3, maximum mass 0.5kg per day.

S2.2.5 Solvents and other organic liquids

There shall be no free layer (whether floating or settled) of, petroleum, benzene, naptha, fuel, solvents or organic liquids.

S2.2.6 Condensing water, cooling water or stormwater

Unless specifically approved in a consent, condensing water, cooling water or stormwater shall not be present.

S2.2.7 Emulsions of paint, adhesive, rubber, plastic

There shall be no emulsions of paint, adhesive, rubber or plastic in the discharge.

S2.2.8 Colour

No waste shall have colour or colouring substance that causes the discharge to be coloured to the extent that it impairs wastewater treatment processes or compromises the final effluent discharge consent.

S2.2.9 pH Value

The pH shall be between 6.0 and 10.0 at all times.

S2.2.10 Presence of chemicals

Any characteristics not mentioned below will be subject to separate evaluation for inclusion in a conditional consent:

  1. sulphides shall not exceed 5g / m3
  2. sulphate shall not exceed 500g / m3
  3. toxic pollutants as listed in Table 2 and Table 3 of Schedule 3 shall not be present above background domestic sewage levels.

S2.2.11 Any other characteristic

Any characteristic not mentioned in this schedule that is present in quantities above background domestic sewage levels, but not above the prohibited levels of Schedule 3, shall cause the discharge to be the subject of a conditional consent.