Large hotels, resorts or construction/mining camps

Hospitality institutions and construction sites are required to follow these guidelines and processes when disposing of trade waste.

Large hotels, resorts or construction / mining camps are defined as a facility which has greater than 180 rooms for accommodation and will generally exclude apartment style hotels which have self-contained room facilities for food preparation.

Permit requirements

Large hotels, resorts or construction/mining camps discharging to sewer are required to apply for and obtain approval to discharge trade waste. This approval is in the form of an trade waste permit.

Investigation of the waste streams within these facilities has identified the following as the main waste producing processes:

  • kitchen (food production/preparation)
  • laundries
  • swimming pools
  • vehicle wash bays
  • cooling towers (commercial climate control system).

The permit attracts an Annual Permit charge, which is invoiced in advanced each July.

Quality–quantity usage charges

Large hotels, resorts or construction / mining camps attract quality and quantity (QQ) charges, reflecting the trade wastewater loading they add to the wastewater system and are levied quarterly in arrears. The calculation of QQ charges is based on the type of activities that occur at the site and is shown in the tables below.

Cooling towers will only be charged as volume only. Volumes will be determined by the installation on a meter on the bleed line prior to discharging to sewer. Refer to:

Commercial climate control waste (PUB 19)

Typical drawing HX33-18-40 – cooling towers

Swimming pools will not be charged QQ charges due to the small size of the pool. They are required to comply with the guidelines as described in:

Commercial swimming pools and spas (PUB 20)

Typical drawing HX33-18-30 – commercial swimming pools and spas

Kitchen (food production or preparation)

Table 1: Standard quality for food production/preparation waste streams

Conductivity
mS/m

SS
mg/L

BOD5
mg/L 

O&G
mg/L

TKN
mg/L

TP
mg/L

pH
(units)

Acidity
mg/L

140 660 1300 340 40 12 5.3 115

Laundry

Table 2: Standard quality for laundry waste systems

SS
mg/L

BOD5
mg/L

40 80

Vehicle wash bay

Table 3: Standard quality for vehicle wash waste systems

BOD5 mg/L

SS
mg/L

O&G
mg/L

TKN
mg/L

TP
mg/L

SO4
mg/L

Cu
mg/L

Zn
mg/L

158  73 14 5 4 51 0.25 0.50
  • BOD5 – Biochemical Oxygen Demand
  • SS – Suspended Solids
  • O&G – Oil and Grease
  • TKN – Kjeldahl Nitrogen
  • TP – Total Phosphorus
  • SO4 – Sulphate
  • Cu – Copper
  • Zn - Zinc

Determination of volumetric component

The volume component for the kitchen, laundry and vehicle wash bay will be determined by either an effluent meter or a process sub-water meter in accordance with the Flow measurement information. The use of sub-water meters must incorporate both hot and cold water supplies direct into the process and will be subject to the following trade waste discharge factor (IWDF) (shown in Table 4) to determine the chargeable proportion of water deemed as the trade waste volume.

Table 4: Trade waste discharge factor for sub-water meters

Waste stream type

Trade waste discharge factor

Kitchen 90%
Laundry 85%
Vehicle Wash Bay 59%

Pre-treatment & plumbing requirements

Kitchen

1. All wastewater (with the exception of the dishwasher) from the kitchen is to discharge to an accepted grease arrestor and sized in-accordance with:

Sizing of grease arrestors for the retail food industry (PUB 23)

Typical drawing HX33-10-00 – grease arrestor

Laundry

1. All wastewater from the laundry is to discharge to an accepted cooling lint in-accordance with:

Typical drawings HX33-18-50 – cooling pit

Typical drawings HX33-18-60 – commercial laundries

Vehicle washing bay

1. All wastewater from vehicle wash bay is to discharge to an accepted pre-treatment fixture to remove hydrocarbons and settleable solids that may otherwise enter the sewerage system. For details of a suitable arrangement see:

Typical drawing HX33-12-20 – external mechanical washdown area with silt sump

2. Sites must have an oil water separator such as Vertical Gravity Separator (VGS), Coalescing Plate Separator (CPS) or Hydrocyclone. Single, double or triple interceptors will not be accepted.

3. Only quick break detergents are to be used.

Cooling towers

1. All wastewater from a cooling tower is to discharge directly to sewer in accordance with:

Commercial climate control waste (PUB 19)

Typical drawing HX33-18-40 – cooling towers

Swimming pools

1. All wastewater from a swimming pool is to discharge to an accepted balancing tank prior to discharging to sewer and in-accordance with:

Commercial swimming pools and spas (PUB 20)

Typical drawing HX33-18-30 – connection to sewer of commercial swimming pools and spas

Note: In regional areas it may not be possible to accept commercial pool waste to sewer due to salt loading in the wastewater system which can affect treated water re-use. We will assess local conditions and advise.

General requirements

All water supply and wastewater connections associated with the facility must be carried out by a licensed plumber in accordance with AS/NZS 3500.

More information

Email us at: tradewaste@watercorporation.com.au


OR


Call us on:

13 13 95