Start-up of the equipment for preliminary mechanical wastewater treatment on WWTP Atotonilco

The presently largest sewage treatment construction site in the world in February 2016

Atotonilco WWTP is the worldwide largest sewage treatment plant which has ever been erected in one single construction phase. Atotonilco is located in the state of Hidalgo in Mexico, about 50 km north of Mexico City. With a total investment of 660 million Euro the project is a construction site of superlatives. The plant is designed for a throughput of 35 m³/s under dry weather conditions and 50 m³/s under stormwater conditions to treat the wastewater of about 10.5 million people, about 60% of the population of Mexiko City. The plant is built with the aim to fight the local water shortage. It is planned to use the treated wastewater to irrigate 80,000 hectares of land.

Project of superlatives: Atotonilco WWTP during the construction phase

HUBER SE was commissioned to supply and install the equipment for preliminary mechanical wastewater treatment and for screenings and grit treatment for this mammoth project. The following machines are installed on site:

Coarse screens:

10 x HUBER Multi-Rake Bar Screen RakeMax® with 35 mm bar spacing

Fine screens:

20 x HUBER Fine Screen STEP SCREEN® SSV with 6 mm bar spacing

Screenings conveying systems:

4 x HUBER Launder Channel HLC 450

Screenings treatment:

4 x HUBER Screenings Wash Press WAP® L 12
2 x HUBER Screenings Wash Press WAP® L 6

Grit treatment:

8 x HUBER Coanda Grit Washer RoSF4/3


Coarse screen line, HUBER RakeMax® with launder channel
Fine screen HUBER STEP SCREEN® SSV, 70° installation angle
Screenings treatment, HUBER Wash Press WAP® L with "half-pipe" discharge system

The complete equipment for preliminary mechanical wastewater treatment is installed on two separate treatment lines. Both the coarse screen RakeMax® and fine screen STEP SCREEN® SSV are screen types that have proven their efficiency on many large sewage treatment plants all over the world. This type of step screen is especially suitable for installation in deep channels.

The screenings from both the coarse screen and the fine screen are removed and transported through a launder channel. The screenings are treated in the HUBER Screenings Wash Press WAP® L units which are suitable for launder channel feeding. A specially designed half-pipe solution is installed as screenings discharge system. The half-pipe design permits easy, densely packed container feeding across the full width of the container.

Grit treatment is ensured by the well-proven HUBER Coanda Grit Washer RoSF4.

Especially the combination of well-proven machines and the reliable, easy-to-operate launder channel solution is setting new standards.

Start-up work for the complete plant is well under way these days. HUBER SE is happy about the first successful steps that have been made to put the equipment for preliminary mechanical wastewater treatment into operation.

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