We are a leading provider of mobile, onsite water treatment packages for hydraulic fracturing and other onshore oil and gas recovery applications. atg Evoqua’s leading, environmentally friendly solution eliminates chemical biocides from the process, whilst onsite water reuse significantly reduces truck movements, lowers water consumption and waste disposal.
The process of Hydraulic Fracturing requires large volumes of clean, sterile water to be injected into the shale formation to release the gas trapped between the rocks. Typically, 20% to 70% of the injected water, together with formation water and other contaminants returns from the well in the form of flowback or produced water.
Large scale removal of this water poses significant problems for operators due to the high level of truck movements required to remove the flowback to an off-site facility and then deliver fresh water in its place. In addition the high costs associated with off-site wastewater treatment and disposal are also of significant concern, with typical disposal costs ranging from £11.00 to £19.00 per m3.
As regulations, planning authorities and politics continue to drive sensitivity over the use of chemicals, truck movements and fresh water use, investment in on-site water treatment solutions that allow flowback water to be recycled and reused for additional fracture stages and new wells have become a major priority for shale gas operators.
atg Evoqua has provided specialist ‘chemical-free’ UV treatment packages for the treatment and disinfection of flow back water before re-injection. Using a specially developed UV system purposely designed to treat flow back water, the atg Evoqua solution targets a range of micro-organisms including SRB’s (Sulphate Reducing Bacteria), Acid Producing Bacteria and Slime Forming Bacteria.
The use of UV disinfection as the primary sterilisation technique has allowed operators to eliminate the need for aggressive biocides such as Glutaraldehyde and THPS from the process. UV treatment has a high disinfection efficiency. Even with low UV doses, a single pass through a UV system (0.2 seconds exposure) will achieve a 5.0 log reduction (99.999%) of micro-organisms such as SRB’s (Sulphate Reducing Bacteria), Acid Producing Bacteria and Slime Forming Bacteria.
Benefits for Shale Gas Projects
Eliminates the need for aggressive biocides – When used as the primary disinfection solution, UV eliminates the need for aggressive chemical biocides such as THPS, Glutaraldehyde & Formaldehyde.
Removes the need for off-site flow-back disposal – As a mobile, on-site water treatment solution, flow-back water can be treated and stored for re-injection on future fracture stages. This eliminates the need for expensive off-site treatment.
Significantly reduces truck movements – By recycling and reusing flow-back water, truck movements required to bring in both fresh water and take away wastewater are significantly reduced.
Based on a well using 30,000 m3 of water, generating 40% flowback, on-site treatment and flowback water reuse could eliminate up to 1,556 tanker trips.
Reduces fresh water usage – By treating flow-back water for re-injection, fresh water usage is only required as a ‘top-up’ function.
Use alternative water sources – When location allows it, using a mobile water treatment plant from atg Evoqua will allow operators to source water from local rivers, canals and coast lines.
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