SOLVIA DeepPureX is a deliverable module for the deep polishing of wastewater. The unit does not merely produce reverse osmosis permeate: it treats the concentrate and the membrane wash water in one system, so that the concentrated pollutants are destroyed in a small volume instead of leaving the site as a separate stream.
The module gathers into a single line ultrafiltration, reverse osmosis, a storage and reaction tank, an adaptive plasma-electrochemical destruction reactor, carbon post-sorption and a controlled blending unit. The raw water passes mechanical pretreatment and, where required, reagent phosphate removal, pH correction or ammonia removal, and then enters ultrafiltration, which lowers the suspended solids content, protects the reverse osmosis stage and forms a steadier flow for the membrane stage.
It is meant for dissolved, poorly degradable pollutants that conventional biological treatment does not remove in full: PFAS, pharmaceutical residues, surfactants, phenols, dyes, micropollutants, products of incomplete oxidation and residual organics. The delivered form is a container block, a skid module or a factory-assembled block-modular unit, and deep polishing enters an operating scheme without major reconstruction. The configuration of the membrane stages, the reactor and the control algorithm follows the composition of the particular effluent.
The reverse osmosis concentrate is not carted away, returned to the head of the treatment works, sent to separate disposal or stored: it goes into a storage and reaction tank. The wash water of the membrane module goes into the same tank — a stream that known solutions do not treat together with the concentrate. Flushing takes off the membrane surface what has accumulated on it: organics, antiscalants, salts, PFAS, membrane fouling products and the reagents of CIP cleaning.
In the tank the mixture is equalised in composition, the swings of the load are smoothed, pH correction is carried out where needed, and the stream is prepared for destruction. The tank carries sensors of pH, conductivity, temperature, redox potential, chlorides, fluoride ion, total organic carbon, residual PFAS, total organic fluorine, free chlorine, chlorates, perchlorates and AOX, and their readings go to the control unit. The destruction mode is chosen from the actual composition of the stream rather than set in advance.
The destruction reactor works in an anodic-oxidation, a plasma or a combined plasma-electrochemical mode, and the mode is selected automatically. Sufficient conductivity, chlorides within the permissible range and a controlled risk of chlorate and perchlorate formation open the anodic-oxidation mode. At a high chloride content, insufficient conductivity or a rising risk of by-products the system moves to the plasma mode, while a mixed composition of the load or an insufficient result from one mode brings in the combined one.
Electrochemical oxidation destroys poorly degradable pollutants, but in the presence of chlorides it carries the risk of unwanted by-products — chlorates, perchlorates, AOX and other organochlorine compounds. The control unit watches these values and, once warning levels are reached, lowers the current density, switches to the plasma or the pulsed mode, or blocks the blending of the treated concentrate with the permeate outright. Oxidation runs in the mode that is admissible by the quality of the final water and by the risk of by-products.
PFAS are stable, resist destruction by ordinary methods and persist in the environment for a long time. The residual concentration shows how much PFAS is left but does not tell destruction apart from sorption or from transfer into another stream, so the efficiency of destruction is judged by several indicators: the rise in fluoride ion concentration, the fall of total, adsorbable and extractable organic fluorine, and the ratio of the fluoride gain to the loss of total organic fluorine.
After the reactor the treated concentrate passes a carbon post-filter. It lowers the content of residual dissolved organic matter, of the products of incomplete destruction, of part of the PFAS transformation products, of residual free chlorine, of peroxide compounds and of odour-forming substances. Harsh oxidation leaves intermediate products behind, and in many systems the stream leaves the reactor without such a barrier; here post-sorption stands as the finishing layer before any blending.
The treated concentrate is not returned ahead of the reverse osmosis module: a return of the concentrate or of the treated stream ahead of the membrane stage may raise the salt load on the membranes and worsen the stability of the system. Instead, after destruction and post-sorption the stream is blended in measured proportion with the reverse osmosis permeate, and the ratio of treated concentrate to permeate is set automatically from the sensor signals. The permeate itself goes to discharge, reuse, process water supply or further disinfection.
Blending is permitted only when the prescribed values are met all at once: total organic carbon, residual PFAS, fluoride ion, total organic fluorine, chlorates, perchlorates, conductivity, salinity, AOX and the quality of the blended stream. If even one of them leaves the limits, blending is blocked and the stream goes for repeated treatment or to a separate outlet. This is how SOLVIA DeepPureX governs every stream after the membrane separation and not the permeate alone.
SOLVIA DeepPureX is SOLVIA's own technological development in the deep polishing of wastewater and the treatment of membrane system concentrates; the technology holds patent protection in Russia. Structural parameters, treatment regimes, the composition of the units, the control algorithms and the admission criteria for blending are selected for the individual site and are not disclosed in open materials.
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