Wookology

Managua Waste Water Treatment Plant

• Posted by Encino on May 11th, 2008 filed in ecology, latinamerica

 

In Managua, a waste water treatment plant is being constructed to help clean Lake Managua which receives more than its fair share of untreated waste water and stinks to high heaven. Currently there are no waste water treatment plants in any of the capital cities of Central America. With the support of the German government in funding the project, the water treatment plant should be completed by mid 2008 and should show definite results by 2010. Above, you see the central feed cylinder of one of six large filtration structures. Some of the system is already in operation.

 

 

The secondary filtration basins.

 

 

The blueprints.

 

DESCPRIPTION OF PROJECT
Within the framework of a programme aimed at improving the waste water situation and at reducing the biological contamination of Lake Managua, we were entrusted with the design and elaboration of tender documents of a waste water treatment plant for Managua city, assistance to the Client (ENACAL) during contract negotiation, as well as supervision of construction and start-up operations.

The subject of the tender was the conclusion of a turn-key EPC contract in compliance with FIDIC, combined with a five-year plant operating contract. The functional tender was based on a treatment process developed by the Consultant which provides for anaerobic ponds followed by trickling filters, as well as an outfall into Lake Managua. Alternate solutions were explicitly allowed.

The present project was preceded by a feasibility study, also prepared by us with the aim of defining the best suited concepts in technical and economical respect.

*Capacity: > 1.09 million p.e.
*Maximum flow to the treatment plant during wet season: 12,400 m³/h
*Biological load: BOD5 = 50,000 kg/d
*Design quality of treated effluent:
Total suspended solids: 80 mg/l
BOD5: 30/90 mg/l (filtered / homogenised sample)
COD: 180 mg/l

BRIEF DESCRIPTION
Preliminary design and preparation of tender documents (EPC turnkey provision); construction supervision and commissioning of the waste water treatment plant of Nicaragua city

CLIENT
Empresa Nicaragüense de Acueductos y Alcantarillados, Managua

FINANCING
KfW Entwicklungsbank

SCOPE OF SERVICES

* soil-mechanical site investigation
* topographical survey
* hydrological investigations
* hydraulic calculations
* design of a basic technical solution
* establishment of a polluters’ register (discharges from industry and trade)

-Pre-selection of contractors
-Tender documents (FIDIC EPC-turnkey)
-Preparation of an operation concept

+Tariff study on sewage treatment charges
+Assistance in contract award
+Construction supervision
+Plant commissioning
+Public awareness building