Ajman Sewerage

Our technical expertise and know-how in the service of used water

  • Collection Network
  • Treatment Plant

Our state-of the art collection network is a comprehensive system that aims to connect most of Ajman to a centralized hub for the collection of used water.

How it works

The system that we have implemented currently covers an area of 30 square kilometres and has over 300 km of pipelines serving up to 120,000 properties in the area. The system relies on 21 basins that collect water from properties via a simple yet effective gravity sewer.

The water is then transported through an intricate series of pipelines by one of our 22 pumping stations that are strategically placed around sectors in Ajman. The used water from the basins is channeled to a final pumping station where it is transferred directly to our innovative used water treatment plant to be safely treated and re-used.

How we keep it running

It is important that our system is kept running 24 hours a day, 7 days a week, 365 days a year, therefore we have in place a stringent maintenance and monitoring practice to stop any faults before they happen.

We therefore carry out continuous and very frequent preventive cleaning of the sewerage network. To do so, we use an innovative approach based on state of the art technologies, such as CCTV cameras and truck-mounted high-pressure water jetting equipment for example, to prevent any fault from taking place and we quickly dispatch our highly trained engineers to oversee the system on a daily basis.

Septic tank collection

In an Emirate that genuinely cares for sustainability, the installation of the underground used water collection network eliminates the inconveniences caused by septic tanks, tankers, and all related issues, and avoids potential public health issue and adverse environmental impact and pollution of the soil.

However, the rising population of Ajman means that not all properties are connected to the collection network. For those properties, third-party sewage transportation companies take care of the collection of used water to our treatment plant. Nowadays, 99% of all tankers discharge at the dedicated tanker discharge facility at our treatment plant.

Our 3-stage treatment makes sure that used water is treated to very high standards to be re-used for many different applications.

Preliminary treatment

The purpose of pre-treatment is to protect the operation of the treatment plant by removing from the used water any constituents which may damage the equipment or interfere with the  treatment process: large suspended or floating solids (pieces of wood, cloth, paper, plastics, garbage, kitchen refuse, organic matter…), heavy inorganic solids (sand, gravel, metal, glass…), and excessive amounts of oils or greases.

Pre-treatment is achieved by screening used water through a set of screens to remove constituents that are up to 6mm thick. Once collected, the physical matter is disposed of appropriately, with environmental practices being implemented. The screened used water then flows trough grit removal units which can remove particles up to 0.2 mm in diameter.

Primary treatment: Upflow Anaerobic Sludge Blanket

The screened and de-gritted used water then flows through the system to the primary treatment where anaerobic biological reactions (without supply of oxygen) take place.

The incoming flow is divided through 8 Upflow Anaerobic Sludge Blanket (UASB) reactors, where the influent flows upwards through sludge blankets which filter and treat the used water thanks to anaerobic microorganisms. As a result, up to 75% of all organic matter is removed.

During this process, both sludge and biogas are produced. The gas is extracted safely and burned off. Excess sludge is removed from the UASB and dewatered using high-powered centrifuges, collected and disposed of.

Secondary treatment: Pre-aeration & Activated Sludge

The partially treated water then flows under gravity into “pre-aeration” tanks where air is blown into the system to remove hydrogen sulfide. It is extremely important that hydrogen sulphide is treated and disposed of effectively as it is toxic and can harm both our employees and the environment. Therefore we have also installed “odor control units” which collect the gas, treat it biologically and keep it from causing harm.

The aerobic treatment utilizes a biological process referred to as “activated sludge process”, where the partially treated influent is further oxygenated through fine oxygen diffusers placed at the bottom of 8 activated sludge tanks. This supply of oxygen activates microorganisms that efficiently further remove the biological content present in the water.

The partially treated water is then transported to one of 4 clarifiers which aim to separate the sludge from it. To achieve this, a continually moving surface skimmer rotates around the clarifier, removing suspended solids from the water. Upon being separated, the sludge is aggregated and dewatered through a series of belt filters and presses.

Tertiary treatment: Deep Bed Filters & Chlorination

The partially treated influent then flows to 10 Deep Bed Filters (DBF) units which are of the gravity sand filter type. The sand naturally traps solids and bacteria between them, allowing only the filtered water to trickle down.

After this process, the filtered water is finally sent to two chlorination contact tanks for one final round of disinfection, to achieve and exceed the required treated effluent standards.

Management and Protection

To manage this complex process we have a variety of systems in place and focus on quality control in every aspect. We have a dedicated team to monitor the quality of the used water in the system with laboratory analysis of the water being undertaken on a daily basis.

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