Dewasting Technologies

Several dewasting technologies including methanol rectification is planned for multiple facilities to recover methanol and reduce the oxygen demand of the distillate. The effluent from distillation and/or crystallization processes will be fed into a rectification column, which is operated at atmospheric pressure and heated with steam in a re-boiler located separate from the column. The sump product of the column is the water condensate which can be recycled or treated further allowing discharge.

The Membrane Biological Reactor/Reverse Osmosis (MBR/RO) system [Patent Pending] being constructed at the Standing Stone facility will allow Eureka to further treat the distilled water produced by distillers or crystallizers (and possibly methanol rectification) using biological treatment processes similar to those that are typically used at most municipal wastewater treatment plants. The MBR system is designed to provide biological removal of chemical oxygen demand (COD) and ammonia in the distilled water feed. The RO system is used as a polishing step downstream of the MBR system to remove residual ammonia nitrogen, bromide and other constituents that may be in the MBR effluent allowing direct discharge or unrestricted reuse.

Dewasting Technology

Eureka Resources provides the necessary level of development and produced wastewater treatment services for cost-effective, efficient recycle and/or disposal in compliance with all Pennsylvania Department of Environmental Protection (PADEP) regulations. The composition of wastewater from gas fields is extremely variable and even the distilled waters generated in our distillation and crystallization processes still contain elevated levels of organic constituents and trace levels of inorganic constituents which require removal before the water is suitable for direct discharge (to a stream or river) or to allow unrestricted (dewasted) recycle by developers.

Eureka uses a combination of technologies to achieve direct discharge or dewasting requirements:

  • Methanol Removal/Recovery - Methanol, when present in high concentrations, may be separated from the distillate using a methanol rectification process which relies on a distillation column to separate the methanol from the wastewater for recovery and beneficial reuse. Methanol is also a biodegradable organic and when present in low concentrations will be removed in a membrane biological reactor.
  • Membrane Biological Reactor (MBR) - The MBR consists of two principal components: (1) a biological reactor tank to biologically degrade organic matter, and (2) an ultrafiltration membrane to retain biological solids within this tank. The membrane is internal to the reactor vessel and provides a barrier to keep microbial solids in the reactor and render a clarified, solids-free effluent stream for reverse osmosis treatment.
  • Reverse Osmosis (RO) - RO is a membrane filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. Residual organics and inorganics are retained on the pressurized side of the membrane and clean purified water is generated.

Eureka's dewasting treatment processes are designed to meet the PADEP WMGR123 dewasting standard which allows unrestricted reuse of the water by developers including storage in freshwater impoundments. Our dewasting technologies also generate treated water that meets direct discharge standards allowing return of the water to the hydrologic cycle.

Excess biological solids will be mixed with our pretreatment system sludge for dewatering and disposal at a landfill. The concentrated residual organics and inorganics are recycled to the head of the facility or mixed with concentrated brine for deep well injection