How does catalytic oxidation convert dissolved ferrous iron [Fe²⁺] into insoluble ferric hydroxide [Fe(OH)₃]?

In deep groundwater, iron exists in the soluble, clear, divalent ferrous state [Fe²⁺]. When passed through our specialized catalytic media bed containing active manganese dioxide (MnO₂), the media acts as an electron donor and catalyst: 2Fe²⁺ + MnO₂ + 4H₂O → 2Fe(OH)₃↓ + Mn²⁺ + 2H⁺. This reaction rapidly precipitates the dissolved iron into visible ferric hydroxide particles that are mechanically trapped within the deep multi-grade media bed and discharged during backwash.

What is the role of manganese dioxide catalytic media (Birm / Manganese Greensand) in chemical-free filtration?

Catalytic media such as Birm and Manganese Greensand accelerate the oxidation reaction between dissolved iron and dissolved oxygen without requiring ongoing chemical feeds such as potassium permanganate or chlorine (provided feed dissolved oxygen and pH are within nominal operating range). The media surface remains active for years because it acts purely as a catalyst, making routine operation completely chemical-free and safe for drinking.

How does cross-flow filtration in your industrial RO systems prevent colloidal fouling and mineral scaling?

Unlike dead-end filters where all feed water is forced directly through the medium until it blinds, our RO plants utilize continuous tangential cross-flow filtration. Feed water sweeps across the surface of the spiral-wound membrane at high velocity; pure water permeates through the microscopic pores (0.0001 micron), while the turbulent reject brine stream carries away concentrated salts and foulants, preventing membrane surface deposition.

What are the benefits of Thin Film Composite (TFC) polyamide membranes in harsh brackish groundwater?

TFC polyamide membranes offer exceptional chemical resistance, structural durability under high operating pressures (up to 250–400 psi), and superior rejection rates exceeding 99.5% for monovalent ions (sodium, chloride) and 99.8% for heavy multivalent minerals and silica. Their cross-linked aromatic polyamide active layer also resists biological degradation.

How does the Moving Bed Biofilm Reactor (MBBR) technology achieve rapid biological digestion in STPs?

MBBR technology introduces thousands of specially engineered virgin HDPE biocarrier media with high specific surface area (> 800 m²/m³) into an aerated biological reactor. Active heterotrophic and nitrifying biomass grows on the protected internal surfaces of these continuously moving carriers. This provides 3 to 4 times higher biomass concentration than conventional activated sludge, preventing sludge washout and digesting organic pollutants in a much smaller physical footprint.

What automated multiport valve options (digital timer vs flow-metered) do you deploy for self-backwashing?

We offer two automated valve architectures: Time-Clock Controlled (Automatic Timer), which initiates backwash at a pre-set hour (e.g., 2:00 AM every 3 days), and Volumetric Flow-Metered (Impeller or Optical Sensor), which tracks the precise cubic metres of water treated and initiates backwash only when the media bed has treated its calibrated volume capacity, maximizing water conservation.

How do your PLC and IoT control panels monitor pressure differentials, flow rates, and feed conductivities in real time?

Our commercial and industrial control skids integrate industrial-grade Siemens or Schneider PLCs with digital pressure transmitters (4–20 mA) across the filter inlet and outlet. If the differential pressure (ΔP) exceeds 0.8–1.0 kg/cm², an automated alert or backwash sequence is triggered. Digital electromagnetic flow meters and toroidal conductivity sensors continuously stream real-time water quality metrics to the operator HMI touchscreen or cloud telemetry dashboard.

Why are composite FRP pressure vessels superior to traditional mild steel tanks in corrosive groundwater environments?

Groundwater with high dissolved iron, hydrogen sulfide, and chlorides rapidly corrodes and pits mild steel tanks from the inside, causing rust contamination and tank structural failure within 3 to 5 years. High-density composite Fiber-Reinforced Polymer (FRP) pressure vessels feature a seamless food-grade thermoplastic liner wrapped in continuous filament fiberglass, providing 100% corrosion immunity, zero chemical leaching, and burst pressure ratings up to 150–300 psi.

What chemical dosing systems (antiscalant, sodium hypochlorite, coagulant) are integrated into your industrial skids?

Our industrial skids integrate precision digital diaphragm dosing pumps (Prominent/Milton Roy) with stroke and frequency modulation. Depending on raw water chemistry, we dose NSF-certified phosphonate antiscalants to inhibit CaCO₃ and CaSO₄ scale formation, polyaluminum chloride (PAC) for colloidal coagulation, or food-grade sodium hypochlorite for microbiological disinfection.

How does your closed-loop hydraulic design achieve up to 75% water recovery in commercial reverse osmosis?

Standard un-optimized single-stage RO plants waste up to 50–60% of their feed water as reject. Our multi-stage recovery engineering recirculates a portion of the concentrate stream into the second-stage booster pass through high-flow low-energy membranes, pushing overall permeate water recovery up to 70% to 75% while maintaining membrane flux rates well below critical fouling limits.

How does automated backwashing fluidize the filter media bed without causing media loss into the drain?

During automated backwashing, our multi-port valve reverses the hydraulic flow direction: water enters through the bottom lateral collector hub and flows upward through the gravel sub-base and media bed at a calibrated velocity (typically 12–15 GPM per square foot). This expands the bed by 30% to 40%, loosening compacted iron floc and releasing it into the top drain port while internal top diffusers prevent dense media grains from escaping.

How do you mathematically determine the required Empty Bed Contact Time (EBCT) for challenging feed water?

Empty Bed Contact Time is calculated as EBCT (minutes) = [Bed Volume (m³) ÷ Flow Rate (m³/h)] × 60. For dissolved iron concentrations under 3 ppm, an EBCT of 3 to 4 minutes is sufficient. However, for severe iron levels (8–15 ppm) or presence of co-occurring manganese, our engineers size the vessel dimensions to ensure an EBCT of 6 to 8 minutes with multi-layer media gradation to guarantee complete catalytic reduction.

Nanotechnology water purification and filtration engineering

Technology That Makes the Difference

At URBAN Water Solutions, we combine regional hydrogeological water testing, advanced reaction chemistry, and precision automated engineering to build systems that deliver pure, healthy water with uncompromising reliability.

Explore Core Architecture Book Lab Water Test

Microscopic Nano-Filtration & Reaction Chemistry 0.0001-micron molecular separation & media adsorption

Engineering Architecture

Core Engineering Architecture

How our multidisciplinary technology ecosystem integrates to guarantee treated water quality.

NODE 01 Analysis

Hydrogeological Diagnostics

Certified laboratory testing of pH, TDS, Iron (Fe), Arsenic (As), Hardness, Turbidity, and Microbiological bacterial count before designing any plant.

NODE 02 Chemistry

Catalytic & Media Adsorption

High-activity manganese greensand, catalytic Birm, high-iodine activated carbon, and specialized ion-exchange resins sized for exact flow velocity.

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URBAN Water Engineering Core

Turnkey Precision Systems

Turnkey Verified

NODE 03 Membrane

High-Rejection Membrane Tech

Polyamide thin-film composite (TFC) Reverse Osmosis membranes with up to 99.5% salt rejection and 0.0001-micron molecular separation.

NODE 04 Automation

Digital Multiport Automation

Programmable microprocessor-controlled valves for automatic backwashing, media rinsing, brine regeneration, and fault diagnosis.

NODE 05 Biological

Biological Digestion & Biofloc (MBBR / SBR)

Advanced biological wastewater treatment using Moving Bed Biofilm Reactors and Sequencing Batch Reactors for COD/BOD reduction and safe water recycling.

NODE 06 Lifecycle

Turnkey Support & Preventative AMC

Continuous engineering support, scheduled media replenishment, rapid onsite emergency dispatch in Agartala, and 1 to 5 years equipment warranty.

NODE 01 Analysis

Hydrogeological Diagnostics

Lab testing of pH, TDS, Iron, Arsenic, Hardness & bacterial count.

NODE 03 Membrane

High-Rejection Membrane Tech

TFC RO membranes with 99.5% salt rejection & 0.0001μ separation.

💧

URBAN Water Engineering Core

Turnkey Precision Systems

Turnkey Verified

NODE 02 Chemistry

Catalytic & Media Adsorption

High-activity manganese greensand, Birm, activated carbon & resins.

NODE 04 Automation

Digital Multiport Automation

Automatic microprocessor valves for backwashing, rinse & regeneration.

NODE 05 Biological

Biological Digestion (MBBR/SBR)

Wastewater treatment using MBBR & SBR reactors for COD/BOD reduction.

NODE 06 Lifecycle

Turnkey Support & AMC

Continuous engineering, scheduled media visits & 1–5 yr warranty.

Our 7-Pillar Technology Framework

Section 15 of our Engineering Standards — seven uncompromising principles engineered into every plant we build.

01 Innovation

Modern Technology

Utilizing current technological innovations in high-efficiency filtration, cross-flow membrane separation, and advanced biological digestion.

02 Validation

R&D-Based Engineering

Continuous research into Northeast India’s groundwater chemistry to optimize media contact time, chemical oxidation rates, and sediment settling.

03 Hardware

Premium Equipment

High-pressure composite FRP vessels with seamless thermoplastic inner liners, SS304/SS316 high-pressure skids, and automated backwash valves.

04 Sourcing

Component Selection

Incorporating tier-1 domestic and globally certified imported components (membranes, dosing pumps, sensors) where required for critical reliability.

05 Compliance

Global Principles

Full adherence to Indian BIS 10500 drinking water standards, CPCB industrial effluent discharge guidelines, and WHO water purification standards.

06 Customization

Application Design

Every system is purpose-built and hydraulically sized specifically for household, hotel, hospital, industrial manufacturing, or agricultural needs.

07 Long-Term Promise

Focus on Long-Term System Reliability & Efficiency

We engineer plants intended to operate continuously for decades. Supported by routine consumable replenishment, structured annual maintenance contracts (AMC), genuine replacement parts, and dedicated field engineering in Tripura and West Bengal.

The Water Filtration & Purification Spectrum

Understanding the microscopic separation stages deployed across our turnkey water treatment plants.

> 50 Microns

Removes coarse sediment, silt & turbidity.

STEP 01

Multi-Grade Filtration (MGF)

Layered quartz sand, silica & anthracite capturing particles to 20–50µ.

Iron & Manganese

Eliminates deep borewell iron & yellow staining.

STEP 02

Catalytic Oxidation (IRP)

Catalytic Birm & Greensand Plus oxidize iron into insoluble filtered particles.

Organics & Odor

Adsorbs VOCs, chlorine & foul water odors.

STEP 03

Activated Carbon (ACF)

Virgin coconut carbon with >1100 IV trapping pesticide residues & color.

Hardness Scaling

Neutralizes white mineral scale & geyser damage.

STEP 04

Ion-Exchange Softening

Premium SAC resin exchanges calcium & magnesium with sodium for soft water.

0.01µ Pathogens

Physically blocks bacteria, cysts & colloids.

STEP 05

Ultrafiltration (UF)

Hollow-fiber capillary membranes providing 99.99% physical barrier.

0.0001µ Dissolved TDS

Reduces toxic heavy metals, arsenic & salts.

STEP 06

Reverse Osmosis (RO)

Thin-film composite membranes for pure drinking & industrial use.

> 50 Microns (Particulates)

Removes coarse sediment, silt, mud, pipe rust, and high turbidity to protect downstream equipment.

STEP 01

Multi-Grade Depth Filtration (MGF)

Multi-layered quartz sand, silica, and anthracite media beds capturing suspended solids down to 20–50 microns with automated backwash.

Dissolved Iron (Fe²⋅) & Manganese

Eliminates deep borewell iron causing yellow staining, metallic taste, and plumbing encrustation.

STEP 02

Catalytic Oxidation & Adsorption

High-activity catalytic Birm and Manganese Greensand Plus oxidize dissolved iron into insoluble particles filtered out instantly.

Organics, Chlorine & Odor

Adsorbs volatile organic compounds (VOCs), harsh chemicals, chlorine, and foul groundwater odors.

STEP 03

Activated Carbon Adsorption (ACF)

Virgin coconut-shell activated carbon with >1100 IV iodine value micro-pores trapping pesticide residues and color pigments.

Ca²⋅ & Mg²⋅ Hardness Scaling

Neutralizes white limescale mineral crust, hair fall, geyser damage, and boiler scaling.

STEP 04

Ion-Exchange Softening & Demineralization

Premium strong-acid cation (SAC) resin exchanges calcium and magnesium ions with sodium, providing 100% soft water across all outlets.

0.01 Micron Pathogen Barrier

Physically blocks bacteria, cysts, pathogens, and colloidal suspended particles without chemicals.

STEP 05

Ultrafiltration (UF) & Micro-Separation

Hollow-fiber semi-permeable capillary membranes provide a 99.99% physical barrier against waterborne microbial contaminants.

0.0001 Micron Molecular TDS

Reduces toxic arsenic, heavy metals, lead, nitrates, fluorides, and Total Dissolved Solids (TDS).

STEP 06

Reverse Osmosis (RO) Molecular Demineralization

Thin-film polyamide composite membranes operating under high hydraulic pressure for pure drinking, dialysis, pharmaceutical, and institutional use.

Closed-Loop Water Engineering Cycle

From raw water extraction to industrial process recycling and compliant environmental restitution.

WATER CYCLE Turnkey Lifecycle 100% Sustainable

Intake Diagnostics & Hydrochemistry

Rigorous testing of raw groundwater or surface water to evaluate iron, arsenic, TDS, mineral hardness, bacteria, and seasonal fluctuation parameters.

Turnkey Engineering & Purification

Installation and commissioning of tailored IRP, RO, DM, or Ultrafiltration systems delivering potable, healthcare, or industrial-grade purified water.

Reclamation, Treatment & Safe Restitution

Biological MBBR/SBR sewage and industrial effluent treatment (STP/ETP), enabling treated water recycling for gardening, cooling, or safe environmental return.

Turnkey Water Engineering

Have a Complex Water Challenge?

Connect with our engineering specialists in Agartala and Kolkata for a professional site assessment, laboratory water test, and customized turnkey plant sizing.

Request Engineering Consultation Explore All 9 Plant Specifications