Wastewater Treatment In Shopping Centres: Treating Bad Smells
Wastewater From Food Courts Can Create Bad Smells
The propensity of food courts and hence food waste means most shopping centres need to have some form of wastewater treatment plant.
The nature of wastewater processes in the food industry generate bad smells or make them worse.
The waste is of biological origin and is decomposing which will always generates odour. Depending on the processes used, wastewater treatment may make the smells worse and release it into the air around the centre.
There are a lot of offensive odours that can be released. The ones that create the most problems in shopping centres are mercaptans or ammonia and the worst of the lot -hydrogen sulphide (rotten egg gas).
All types of shopping centres, which include food processing amongst its activities, can be subject to odour issues.
Why Are Bad Smells A Problem In Shopping Centres?
Modern shopping centres use wastewater storage tanks, compactors, food bins and more sophisticated equipment such as grease trap dissolved air flotation systems, all of which can generate foul odours.
The footprint of shopping centres often means the wastewater plant is located in or close to public areas such as the carpark. The very nature of the shopping centre because means they are located in residential areas.
Therefore, the potential for public complaints from bad smells is a real problem for shopping centre management. In the worst cases, the shopping centre management can attract fines or even have the centre closed until the odours are removed.
What Options Are Available To A Shopping Centre To Reduce Bad Smells?
There are a number of alternatives to reducing bad odours in shopping centres. However, it’s often the case that the shopping centre manager has limited options available to them to solve the bad odour problem because the potential issue was not addressed fully when the wastewater plant was installed.
- Change the process or relocate the wastewater plant. This may involve considerable capital cost and may be inappropriate i.e. an effective alternate process is not available
- Create a sealed environment. The options here include locating the wastewater treatment process in a controlled air environment in a shed; filter the air through activated carbon filters or using sealed lidded equipment.
- Chemical This a simple and cost-effective option.
What Are Chemical Deodourisers?
There are two types of chemical deodourisers available to shopping centre managers to deal with bad smells from wastewater. These are:
- Neutralising agents. A group of deodourisers that chemically combine with the chemicals that create the smells and neutralise them.
- Masking agents – which are essentially highly perfumed products which cover up the smell.
Both types chemical deodourisers are available as a concentrate. The concentrate is simply diluted and sprayed into the atmosphere surrounding the shopping centre wastewater treatment equipment.
Spraying units are normally supplied by the chemical deodouriser supplier to allow their product to be applied. These units are available in multiple configurations and can be adapted to suit all plant sizes.