Chilliwack, 13 December 2018 – Tertiary wastewater treatment is the last stage of the sludge multi-stage cleaning process. Through this stage, there is the removal of bacteria, inorganic components, parasites, and viruses. The removal of these toxic substances makes the resultant water safe to be reused, recycled or excreted into the environment. This treatment process makes use of water separation filters that facilitate the removal of the mentioned harmful substances.

To understand how tertiary sludge treatment functions, let's consider the following overview that includes methods and processes used in the whole treatment.

Preparing Sludge for Tertiary Sewage Treatment

Before we delve into the nitty-gritty involved in tertiary sludge treatment lets in a nutshell review secondary and primary sludge treatment.

Primary wastewater or sludge treatment includes filtration of solid contaminants from the sewer. Then this is followed by purification of the remaining solution using oxidation, aeration, and bio-filtration in water separation filters. These three processes help remove the remaining sediments from the solution.
Furthermore, municipal dewatering solutions assist in carrying out the triple stages of sludge treatment. These three stages are instituted to offer protection to people and the natural environment from the effects of untreated water.

Tertiary Sludge Treatment Methods

Tertiary sludge treatment usually means the last filtration of the treated product. Sometimes when the need arises, alum is used to extract phosphorous entities from the water. This substance also coagulates all the solid particles that were not previously removed. They can now be filtered out easily. Filters are then back-washed to flush out any floc build-up, which allows the water separation filters to continue functioning effectively.

Disinfection

Disinfection is a vital part of wastewater treatment that involves the addition of chlorine to the final product before discharge. During this process, chlorine is injected into the head-works of a serpentine detention chamber. The reason for using chlorine is to terminate any bacteria and viruses while at the same time killing any parasites present such as Giardia which can pose a health risk or serious diseases. In a nutshell, this stage helps in disinfecting the water consequently making it safe for reuse or can be recycled to help run other processes.

Dichlorination

This is the final stage of tertiary treatment, and it involves removing chlorine that was injected to disinfect the water. Removing chlorine is vital because chlorine affects aquatic life. Additionally, it can reduce the biological water quality when present in large quantities. Dichlorination is facilitated by the addition of a compound known as bisulfite. The chemical reacts with chlorine ions and eliminates its presence. The water is then considered safe for reuse when the level of chlorine is suppressed.

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