Selected Environmental Projects Description

Selected Engergy Projects Description


WWTP Design and Construction for Biological Nutrient Removal


     Design services were provided for the design of wastewater treatment facilities for biological nutrient removal. The design capacity of the plant was 2.0 mgd. The WWTP was designed to meet total nitrogen andphosphorus discharge limits of 3 and 0.3 mg/L, respectively. The five stage Bardenpho Process was utilized in the design for biological treatment. Chemical precipitation of phosphorus was also provided for treatment redundancy.

  In addition to the Bardenpho process, effluent filtration was provided with deep bed denitrification. Sludge handling facilities included mechanical sludge thickening, aerobic digestion and sludge dewater using recessed plate filter presses.

  An advanced monitoring and control SCADA system was provided. The system monitored process variables and controlled return sludge flow, waste sludge flow, pH, dissolved oxygen (DO), and nitrate with closed loop feed of required chemicals.

  Construction administration services were provided. These services included construction inspections, shop drawing eview, and contract administration.

  A detailed operation and maintenance manual (O & M Manual) was provided with interactive electronic format. The manual was used for operating training.

  Start-up services were provided and on-going operational support was provided for one year after start-up to assure successful operation and transition to owner personnel.

Turnkey Textile Dyeing and Finishing WWTP Design and Construction


Condiciones Operacion WWTP

Aerial WWTP

Turnkey engineering and construction services were provided for a 3.75 mgd wastewater treatment facility located in Honduras. The discharge contained wastewater from cotton and cotton/poly blended fabic dyeing and finishing operations as well as sanitary discharges from the facility. The system provided extended aeration biological treatment and utilized ozonation for color removal. On-site oxygen generation was provided.Design, construction, start-up, and training services were provided, including Operations and Maintenance Manual.

Denim Wastewater Treatment Plant Design


 Design and construction administration services were provided for denim dyeing and finishing plant located in Nicaragua. The design included all required disciplines and included detailed drawing and specification in English and Spanish. The design included secondary biological treatment with chemical coagulation for color removal. Specification included bid packages and assistance in reviewing and selecting of the successful bidder was provided. Site inspections were performed during the construction to review performance relative to design requirements.

 After completion of construction, start-up services were provided. These services included development of an O&M Manual in English and Spanish, operator training, and one-year of operational assistance utilizing an internet based data management system.

Waste Load Allocation (WLA) Model

     A mathematical water quality model was developed to project waste load allocation for client's plant discharge into a nearby river. The model predicts the waste assimilation capacity (WAC) of the portion of the river impacted by the client's WWTP effluent. After configuration and calibration, the water quality model was used as a basis for both process design and negotiating regulatory permit requirements.

   As a result of the model, discharge limits were increased to be compatible with the receiving streams assimilative capacity. This resulted in significant operating cost savings.

WWTP Design and Construction Services

  Engineering Design Services and construction services were provided for the treatment of wastewater from textile dyeing and finishing operations. Services included: design drawings, construction specification, equipment specifications, design of the WWTP Controls Systems, periodic construction management services in coordination with client's civil Construction Manager, and WWTP start-up training and assistance. A detailed operations and maintenance (O&M) manual was developed in both English and Spanish in both hard and electronic forms.

   The design capacity of the plant was 2.8 mgd and the extended aeration activated sludge process was used. Due to the high color level entering the plant from cotton dyeing operations, a unique anoxic treatment process was employed to decolorize azo-reactive dyes. This process proved to be extremely successful and significantly reduced operating cost for color removal. Chemical treatment was also included providing the capability to remove virtually all color prior to to discharge. The design also included a sludge thickener, recessed plate filter press for sludge dewatering, and an advance process control and monitoring system.

  Start-up training and on-going support using an internet based environmental management system were also provided.

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