ACWA's Balanced Approach To Wastewater Treatment
19 August 2010, News release from ACWA Services
With increasingly-tough legislation on disposal of wastewater to the environment, choosing the optimum solution to balance regulatory quality demands against soaring energy and sludge disposal costs is a critical consideration for both the municipal and industrial sectors.
ACWA is ideally positioned to provide clients with an optimum solution, or combination of solutions, to overcome this difficult challenge. With more than 20 years experience in designing, installing, commissioning and operating wastewater treatment plants for a wide range of municipal and industrial clients, the company has been involved in a variety of high-profile, prestigious projects such as the prestigious Al Ansab wastewater treatment plant in Muscat, Oman and the high-tech KAUST MBR wastewater treatment works in Saudi Arabia.
The company's comprehensive offerings include conventional and advanced technologies across the entire range of treatment stages from preliminary screening through to re-use.
Preliminary treatment technologies offered include coarse and fine screening, grit removal, balancing and calamity systems, pH correction, nutrient addition and polymer systems. Moving further into the treatment train, ACWA's primary treatment capabilities range from conventional settlement through to high rate solutions such as bio-filters, lamella separators and dissolved air flotation (DAF) systems. The company also provides a range of fat, oil and grease removal products for industrial applications.
In the secondary treatment arena, ACWA can provide aerobic solutions ranging from simple partial treatment to multi-stage plants that can effectively deal with a wide spread of effluent types to client requirements. The company is able to provide low and high rate biofilters, activated sludge systems, sequencing batch reactors, membrane bioreactors, nutrient removal and high-rate ammonia removal systems (such as the company's acclaimed proprietary Amtreat® system).
Amtreat® is a high-rate activated sludge process designed to treat high-strength ammonia wastewaters, typically digester or centrifuge liquors or liquid discharges from industrial sites. The small-footprint process can reduce ammonia and total nitrogen levels sufficiently for the treated effluent to be discharged directly to a watercourse or wastewater treatment works. The solution can easily be retrofitted into an existing tank as part of a larger wastewater system or utilised as a standalone plant.
ACWA also offers a proprietary hybrid anaerobic reactor particularly suited to treating high organic strength industrial wastewaters that combines the benefits of upflow anaerobic sludge blanket (UASB) and anaerobic filter systems, typically removing 80% of the organic load.
The company also provides tertiary systems for locations where stringent discharge standards must be met, including continuous upflow, rapid gravity and moving bed sandfilters as well as nutrient removal systems.
Quaternary systems that provide effluent quality suitable for re-use are also within ACWA's skillset. Such systems include chlorination and granular activated carbon (GAC), micro and ultrafiltration, reverse osmosis and ozonation.
ACWA's small footprint Memtreat® membrane bioreactor is ideally suited for municipal and industrial applications, producing an effluent suitable for direct discharge or reuse. To date, ACWA has supplied over 30 MBR systems around the world, supplying flat-sheet membranes to one of the world's largest MBR treatment plants at Al Ansab in Muscat, Oman. Here, the submerged membrane bioreactor facilities will initially treat a 76,000m3/day flow using double-deck modules. Ultimately the works will treat up to 220,000m3/day of wastewater from a 900,000 population equivalent. Here, the requirement for high-quality effluent and restricted site made MBR technology an obvious choice.
As ACWA Proposals manager, Gary Harris, says: "In wastewater treatment, there are many different considerations that need to be taken into account, key among which are the effluent quality required, the desired energy usage, the logistics of the site itself and the ultimate fate of the sludge byproduct. There is a complex cost and quality equation that ACWA's considerable experience in this field allows us to resolve on our clients' behalf. And our vast range of solutions speaks for itself - we truly have the capability to resolve any issue that a client might be experiencing."
For further information please email ACWA Services