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Home » Industry News » Recycling & Waste Management » Effectively treat contaminated water

Effectively treat contaminated water

NATIONAL and local government regulations are specific in their protection of municipal sewers and storm water drains against grease and oil pollution. Contaminated water must pass through a grease trap – catering industry, or oil separator – automotive and petroleum industry, before discharging into the sewer system. 

Pollution Solution’s Sewer Guard™ systems are designed to trap grease for the safe and cost-effective disposal of water-borne grease and oil. Its systems are 100% manufactured in South Africa to national and local legal requirements and Pollution Solution hold two patents on its products; including a unique separator  or fuel and oil pollutants. 

Sewer Guard™ NS series of equipment has been specially designed to protect municipal sewers and storm water drains from pollution by both minor and major spillage of petroleum fuels and oils, particularly in service stations’ forecourts, workshops and wash bays. 

Contaminated water, usually wash-down water from the under-canopy area of a service station or from a workshop floor, is drained into an underground sludge/silt collection tank in which solid material accumulates for regular clean-out. 

The contaminated water then overflows into the underground separator tank which is specially designed to permit and maintain the gravity separation of water and the hydrocarbon contaminants: the latter are lighter than water and float to the top of the separator tank. 

Under usual conditions of low levels of water contamination the accumulation of contaminants slowly overflows the separator into the drain box, a sealed tank with elevated breather, which requires regular pumping-out to maintain it as “normally empty”.

At the same time, wastewater regularly underflows from the tank to sewer. 

Under the extreme condition of a major petroleum spillage, alternatively neglect to empty the drain box, the drain box fills and the separator tank itself begins to fill, from the top downwards, with contaminant(s). Without a special safeguard the contaminants would eventually reach the underflow connection and cause major contamination of the sewer: that safeguard is provided by the Sewer Guard™ patented float valve system. 

Catering Grease traps

Sewer Guard™ also provides safe and cost effective grease traps to control pollution from catering waste polluted by the following kitchen activities such as:

  • food preparation [peelings, off-cuts, solids],
  • cooking [grease, oil, spillage, floor wash water], and
  • cleaning of equipment (pots, pans crockery, cutlery, dishwashers).

Pollution Solution’s equipment includes under sink grease traps, floor drains, sludge catchers, large grease traps/interceptors and sample points. The regulations are categorical in the requirement for separation of solids to be carried out in a separate compartment from, and prior to, the separation of oils and fats. A grease trap system therefore comprises of four units: a floor drain (1), a solids catcher (2) followed by the grease trap itself (3), and a sample point. (4)

SANS 10 252-2 [National Building Regulations] defines the minimum requirements for grease traps for catering and food processing businesses. he following institutions are affected. 

  • bakeries
  • cafes
  • canteens at factories and offices
  • conference centres
  • food manufacturers
  • golf courses
  • hospitals
  • hotels
  • pubs and inns
  • restaurants
  • schools and colleges
  • shopping centres
  • sports venues
  • service stations
  • take away outlets
  • theatres

Other than supplying a large client base in South Africa Pollution Solution systems have been supplied to Australia, Angola, Botswana, Mozambique, Namibia, Nigeria, Seychelles, Swaziland and Uganda.

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