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Northeast coal fired power plant uses Evoqua ion exchange resins to remove vanadium from wastewater
When a coal-fired power plant in the Northeast discovered that the runoff from its ash pile contained vanadium levels exceeding discharge limits, it contacted Evoqua Water Technologies, for assistance. Test results showed ion exchange (IX) resin would remove roughly two pounds of metal for every cubic foot of resin. Calculations indicated the entire pond could be treated with less than 60 cubic feet of ion exchange media. The Evoqua’s solution featured two (2) 36” x 72” steel vessels, each containing roughly 30 cubic feet of resin. The tanks were installed in series with sampling ports after each vessel. The final effluent is sent to a holding tank for testing by a statecertified laboratory prior to discharge, to confirm that the vanadium level is within limits. When the resin in the vessels reaches capacity, the local Evoqua service branch is notified and delivers fresh tanks containing new resin to the site. Exhausted tanks are shipped to Evoqua’s RCRA-permitted treatment facility where the contaminants are removed from the resin and recycled into a raw material.
Revision Date: 12/9/2016
Tags: Evoqua, Wastewater, Ion Exchange
Audit by Evoqua results in power plant savings for power, chemicals and labor costs
An uninterrupted supply of high-quality water is vital to power plant operations. When making outage plans that include preventative maintenance on key plant systems, plant personnel should address the plant’s water treatment equipment, ensuring it receives the same high level of attention as its boiler, condensers, turbines and process equipment. So, how does a maintenance planner know whether the water treatment system is operating at its best and that it can meet the power plant’s current and future demands? One way is to plan an audit of the water treatment equipment before a planned outage. The audit should start with a system check-up to assess system conditions, performance and efficiencies and to pinpoint areas that need improvement. The check-up also can determine if a full system audit is required to provide a more in-depth investigation of a single or multiple water unit operation. The system audit should address the individual challenges of specific situations and include an in-plant survey and a summary of findings and recommendations for improvement.
Revision Date: 12/9/2016
Tags: Evoqua, Wastewater, Cost, Reverse Osmosis, Ion Exchange
Ovivo condensate polishing system is installed at large South African Power plant
The Eskom Medupi Power plant has installed an Ovivo Condensate Polishing Plant (CPP) at all six coal fired units. The CPP is designed to produce treated condensate with cation conductivity less than 0.1 μS/cm, chloride less than 1 μg/l (less than 1 ppb) and silica less than 5 μg/l (less than 5 ppb). The CPP treats 100 per cent of the condensate flow under normal operating conditions. This removes iron and copper corrosion products, as well as dissolved cationic and anionic impurities, while allowing ammonia ions to pass through, when operated in the ammonia cycle, maintaining a high pH to protect the condenser. The first stage of condensate polishing utilizes cartridge filters to remove most of the particulates.
Revision Date: 11/14/2016
Tags: Ovivo Inc, Cartridge, Condensate Polishing, Ion Exchange