Electro Oxidation Basics#6: Reverse Osmosis vs. electro oxidation
Reverse Osmosis vs. Electro Oxidation for Wastewater Treatment, Which Approach Is Better, Chance of Combination
This contexts is actually a technical breakdown and comparative comparison of reverse osmosis and electro oxidation on industrial wastewater treatment, then covering mechanisms of reverse osmosis and electro oxidation in industrial wastewater treatment, followed by probing advantages and disadvantages of reverse osmosis (RO) and electro oxdiation (EO), operation barriers with these two approaches, possible methods to combining reverse osmosis and electro oxidation to accomplish better treatment results, therefore ROI, compliance with regulations.
We hope this content can be one of the sources to enhance your comprehension of of both RO and EO in industrial wastewater treamtent, help with decision making procedures, and optimize your industrial wastewater treatment processes, whether you are a factory owner, manager, or waste water treatment engineers, designers, environmental consultants, wastewater treatment plant operators/technicians.
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Reverse Osmosis Bascics: Mechanims, Advantages, Application, And Cons
very first question is, what is Reverse Osmosis RO? Reverse Osmosis RO, a filtration process that pushing water molecules through the reverse osmosis membrane which is semi-permeable, while leaving most of the substances, e.g. organic compounds, bacterias, progens, and dissolved salts by applying certain ranges of pressure bigger than natural osmotic pressure.
So basically, as a physical treatment method, the RO memebrane is much like a door with holes that only allow matters at certain sizes to pass, while subtances larger than this range of size remains before the door, which means whatever the pollutants within your industrial wastewater, what RO does is to concentrate all these substances in the effluents remained, that is move these contents from the water, instead of destorying pollutants.
Reverse Osmosis Mechanisms
As we mentiond earlier, RO membrances are like holes on the door, these membrances are designed to function like switches with precise control, and pre-designed holes to allow some matters to pass through, while restraining accesses of certain arrange of substances. Key to the points is selective pass-through based on molecular weights.
By applying a high pressure at some 150 to 600 psi, exceeding the natural osmotic pressure, water molecules are driven through the membrane’s microscopic pores, while rejecting 99% of contaminants with a molecular weight bigger than 200 g/mol (grams per mole) like salts, heavy metals and other ions, particles, typical microorganisms like pathogens, therefore trapping these pollutants in the remaining RO concentrate/brine stream. While streams of purified water called permeate can be reused.
Reverse Osmosis Advantages
RO produces extremely high-quality permeate suitable for industrial processes (e.g., boiler water), municipal reuse, and agriculture. It effectively removes total dissolved solids (TDS), heavy metals, bacteria, and viruses.
Even if initial investment is huge, RO units are compact and modular, self-contained, automatic designs, it demands few or no operator interactions, lower operation costs, allowing for easy integration into existing, smaller-footprint wastewater systems.
Modern RO can remove some 99% of various pollutants, which make it critical for wastewater reuse, slash raw water consumptions, and wastewater discharges, achieving Zero Liquid Discharge (ZLD) in industrial sectors, helping facilities meet strict environmental regulations and avoid penalties
Reverse Osmosis Application Ranges
RO is widely used to purify drinking water for municipal and residential purposes as reverse osmosis is efficient in fluoride, lead, arsenic, and nitrates removal. Converting high-seawater and blackish water into potable water in coastal areas and on vessels.
Removes minerals to prevent possible scale and corrosion therefore effective in preparing boiler feed water. Produces ultrapure water for semiconductor ad pharmceuticals manufacturing processes.
Recovery of water from industrial produced wastewater, irrigation, and remove heavy metals, for instance, Cu, Zn, Ni, Cr and etc from metal finishing and electroplating wastewater.
Concentrate wastewater from food, beverage, paper & pulp processes for effluent reduction and recovering some 80-90% of water. Treating high-TDS effluents such as flue gas desulfurization (FGD) wastewater.
Drawbacks of Reverse Osmosis In Industrial Wastewater Treatment
Industrial effluents usually with huge amount of organic, inorganic compounds that cause RO membrane fouling and scaling, these slash permeate flow and efficiency, demanding frequent, harsh chemical cleaning, which means influents with RO required extra pre-treatment.
RO concentrates often contains high levels of salts, heavy metals, and organic pollutants, which means it requires extra post-treatment. RO systems require high-pressure pumps, and RO membranes requires frequent replacement.
RO is a non-selective technology that remove dissolved solids, residual chlorine and specific solvents can chemically degrade the polyamide membranes, leading to loss of selectivity and shortened lifespan.
Reverse Osmosis Vs Electro Oxidation In Industrial Wastewater Treatment
RO vs. EO on Industrial Wastewater #1: Contaminant Type & Concentration
Pollutants types and concentration level matters when it comes to selection of Reverse Osmosis or Electro Oxidation, therefore we make this part as the very first aspect.
Reverse osmosis and electro oxidation Reverse osmosis (RO) can be adopted to remove dissolved inorganic salts and TDS from various types of industrial wastewater.
While Electro Oxidation (EO), as a destruction approach, is there for removing persistent organic pollutants, wastewater with high TOC, harsh COD/BOD ratios, dyes, or phenolic compounds, and other refractory organic compounds.
Therefore, it’s possible to combine RO with EO in complex wastewater treatment, particularly with BDD electrode as the core component.
RO vs. EO on Industrial Wastewater Treatment #2: Water Recovery
Water recovery is pretty important as scarcity of water is universal all around the world as we speak, in this specific part, we discuss about the selection between Reverse Osmosis and Electro Oxidation when it comes to water recovery in industrial wastewater treatment processes.
Electro Oxidation (EO) is usually more suitable when it comes to high-recovery applications, as eletro oxidation processes can offer an upward of some 85–95%, especially where minimizing reject volume is crucial.
Reverse osmosis on the hand, generally operates at 50–85% recovery, some modern RO technology can reach some 80-90% water covery, however, constant RO operations generate more RO concentrations, which mean there will be further treatment after the existing RO process
RO vs. EO on Industrial Wastewater#3:
Operating & Maintenance
Operation and maintenance costs are critical when it comes to choosing the right method to treat wastewater, in this sub-content, we discuss about the differences of RO and electro oxidation in operations and maintenances, especially for on-site treatment of industrial wastewaters.
RO requires high-pressure pumps to overcome osmotic pressure, which means power consumptions with those semi-permeable membranes and pumps are kind of low while comparing with electro oxidation, as EO is simply relies on direct current which demands huge amount of electric power.
While RO requires frequent membrane replacement and maintenance, because of the membrane fouling and scaling we mentioned earlier, followed by potential extra costs with chemical cleaning. While electro oxidation does not require filtration or membrane, reduced downtime.
RO vs. EO on Industrial Wastewater#4:
Pretreatment
Purpose: The main goal is to reduce the energy-intensive burden of high COD, organic compounds, and large solids, which improves the conductivity and efficiency of the electrochemical process.
Sedimentation, filtration treatment can be to remove total suspended solids (TSS)and slash high organic loads, etc, to enhance conductivity of electrolytes, boost efficiency of EO unit toward recalcitrant pollutants.
Ultrafiltration (UF) and chemical treatments, pH adjustment can be adopted to remove suspended solids, turbidity, pathgeons, and large molecular weight organics, prevent membrane fouling and inorganic scaling, and dechlorination, optimize solubility of salts.
EO is particularly effective at treating RO concentrate, reducing toxic, persistent pollutants that are refractory to other approaches.
Optimal Solution for Reverse Osmosis (RO) Concentrate Treatment
Get instant reply from our engineering team to get a better comprehension about how highly effective, reagent-free electro oxidation process for treating Reverse Osmosis (RO) concentrate, leveraging high salinity to degrade recalcitrant organics, remove ammonia, and reduce toxic
Analyzing treatability valuation and engineering appraisal with different electode materials in the lab and real world on-site testing.
Conducting a treatability trial to outline the pilot project with BDD electrode at a more reasonable price than competitors.