Measure and treat sulfates in water flows
Many industrial processes produce or depend on sulfates. Sulfates can be regulated in some discharges and require cost-effective management. Saltworks can help you to monitor and moderate sulfate levels in wastewater flows.
INCREASE FRESHWATER RECOVERY
Sulfates are of concern in many processes e.g. mining, oil & gas, fertilizers, and more. Although not generally very dangerous to humans, high sulfate levels can be regulated to protect the environment. Sulfates can be targeted for removal, without needing to treat all dissolved mass in an entire flow. Targeted treatment saves money.
For seasonal sulfate challenges, chemical precipitation treatment may keep capital investment low, with chemical addition operating costs for only part of the year. If the challenge is year-round, and there is a low-cost disposal option for a sulfate rich brine, sulfate-rejecting membrane solutions may make more sense. We can help you to make informed choices with economics for all options.
Measuring sulfate ions in real-time enables targeted treatment and process optimization. Saltworks can provide automated, real-time sensors for sulfate ions. This live data can then be used to optimize a sulfate treatment process through:
- Bypassing a portion of the flow around the treatment plant, and blending to meet a treatment goal
- Treating to the right level, and not over-treating, resulting in excessive chemical waste, sludge generation, or brines
ScaleSense sulfate sensor was specifically developed to work with the toughest waters including high total dissolved solids (TDS) >50,000 mg/L.
Sulfates can be precipitated by adding low solubility counter ions such as barium or calcium. Our BrineRefine system performs chemical precipitation in a smart, automated way to prevent overdosing. If inlet water chemistry changes, so does chemical dosing. BrineRefine enables smart selective precipitation and is:
- Automated with simple solids management, avoiding coagulation, flocculation, and large clarifiers.
- Free of coagulants or flocculants; no chemicals are added that could foul a downstream RO.
- Compact: BrineRefine eliminates the need for large reaction vessels and clarifiers.
- Designed for modularity, factory-built in ISO container skids of ~600 m3/day capacity per skid, with built-in redundancy and scalability by adding more skids (e.g. 3 skids × 600 m3/day).
- Larger capacity (e.g. 10,000 m3/day) site-built units are available, in which incorporating site ponds as treatment reactors further reduces capital costs.
Nanofiltration (NF) is a cousin of reverse osmosis (RO), which rejects multivalent ions such as sulfates, while allowing monovalent ions to pass through. This limits total dissolved solids (TDS) mass load in the brine and can save brine management costs. Saltworks provides intelligent NF or RO sulfate treatment solutions in our XtremeRO product family—and also provides solutions for liquid reject.
Sulfate Removal Related Products
BrineRefine Chemical Softening System
SaltMaker ChilledCrys Chilled Crystallizer
XtremeRO/NF Brine Concentrator
Sulfate Removal Related Resources
There are many sulfate treatments available, with different advantages and disadvantages. Factors for consideration include capital and operational costs, solid vs. liquid brine reject for disposal, if the need is seasonal or year-round, and suitability for adverse operating conditions.
Real-time measurement provides prompt feedback for controls. A real-time sensor can help to optimize your process, reduce risk, and minimize operational and maintenance demand. Saltworks has developed a new real-time sensor—that is simple and robust—to operate in the high-TDS range.
Saltworks completed an off-site FlexEDR Selective pilot test to treat flue gas desulfurization (FGD) wastewater from a coal fired power plant in China. The objective was to reduce chlorides such that the FGD wastewater could be internally recycled and final treatment costs reduced notably.