Northern Territory Chamber of Commerce and Industry, and Carlton & United Brewery

The Monitoring and Pre-treatment of Brewery Trade Waste Prior to Discharge: Carlton & United Brewery

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Courtesy of Northern Territory Chamber of Commerce and Industry, and Carlton & United Brewery

Carlton United Brewery installed a Trade Waste Monitoring System to analyse the temperature, flows, pH and chemical compounds in their trade wastewater. This cleaner production initiative was a licensing condition of the Northern Territory's Power and Water Authority (PAWA). As a result of the pretreatment, CUB is able to discharge their brewery wastewater to sewer.

Background

Carlton and United Breweries purchased the Darwin Brewery in October 1996 and commenced operations in November 1996. The Brewery is situated in the Trade Development Zone in the suburb of Berrimah which is 15 minutes from Darwin's CBD. The Brewery has a rated capacity of 200,000hL and is currently running at 10% of its rated capacity and therefore producing 20,000hL per year. The Darwin Brewery of CUB produces all of the bulk Victoria Bitter and Carlton Light for the Northern Territory. The brewery also produces the infamous 2 litre 'Darwin Stubby.' The Darwin Brewery operates with 5 permanent multi-skilled staff, each of who are capable of working in the different areas of production and racking.

 

The Process
Generation of Trade Wastewater

The CUB Brewery in Darwin produces brewery wastewater that can be characterised into three different groups, which are:

1. Trade wastewater from production;
2. Sanitary wastewater from amenities; and
3. Rainwater.

The sanitary wastewater produced on site contributes only a minimal loading whether measured as organic material or as flow at Darwin Brewery. Despite its potential minimal impact, CUB management ensures that it receives the required attention so as to avoid incidents such as clogging of pumps and screens. They have installed a series of pipes, fittings, fixtures and appliances to collect and convey wastewater to the sanitary drainage system, which is directly connected to the sewer. The significant volumes of rainwater occurring during the Northern Territory's 'wet season' are discharged to a stormwater drainage system within the CUB premises. This action is essential for the successful operation of CUB's trade waste system, which could be disrupted by unmanaged rainwater runoff.
The amount of trade wastewater produced at the Darwin Brewery is solely dependent on the extent of production and the efficiency of water usage. CUB on average produces 36,000kl of trade waste per annum. The peak trade wastewater flow at CUB is usually in the order of 2.5-3.5 times the average flow. The period of peak flows at the Darwin Brewery occurs over a relatively short period of time. These flows occur in the brewhouse and the beer processing area, as they are associated with cleaning operations. In the packaging area peak flows occur when the line is closed down and the bottle washers and tunnel pasteurisers are emptied. Peaks can also occur in the water treatment area during the backwash of filters.

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