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.
Sewer Guard™ systems are designed to trap grease for the safe and cost-effective disposal of water-borne grease and oil. Our systems are 100% manufactured in South Africa to national and local legal requirements. We hold two patents on our products; including a unique separator for fuel and oil pollutants.
Other than supplying a large client base in South Africa we have supplied systems into Australia, Angola, Botswana, Mozambique, Namibia, Nigeria, Seychelles, Swaziland and Uganda.
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 later 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.