The Facility

Merrimack Station is Public Service of New Hampshire’s (PSNH) largest power plant. Merrimack Station produces enough energy to supply 190,000 New Hampshire households and employs more than 100 people under normal operating conditions. Guided by state and federal clean power laws, PSNH and its customers have invested millions in environmental initiatives to reduce emissions at Merrimack Station. Today, the plant meets or exceeds all environmental regulations; and, with the completion of the Clean Air Project in 2013, it will be one of the cleanest coal-fired power plants in the nation.

Project Overview

PSNH implemented a major project at their Merrimack Station to reduce mercury emissions from Units 1 and 2. Liquid effluent from the FGD and heavy metals removal process requires treatment and recovery for re-use as scrubber makeup. The Zero Liquid Discharge (ZLD) process is designed to treat the wastewater. The solid discharged from the ZLD process is then landfilled.

Scope of Service

Aquatech provided a 65 GPM (15 m³/hr) Brine Concentrator and an 8 GPM (1.8 m³/hr) Two-Effect Crystallizer and a 1 x 100% Belt Filter Press. Aquatech’s integrated solution includes physical/chemical and evaporation technologies that will enable customers with scrubbers to achieve greater environmental responsibility and development of environmentally friendly power facilities.

Design Water Analysis

Process Flow Diagram