↓Hybrid Electric Scrubber

Discussion on the Principles and Applications of Hybrid Electrochemical Scrubber Apparatus

I. Introduction: Background of Environmental Protection Technological Innovation and Positioning of the Device

Under the dual driving forces of the global “dual carbon” goal and the tough battle of environmental pollution control, the collaborative treatment technology of industrial waste gas and wastewater has become the key to solving the environmental protection problems of high-pollution industries. According to the “Comprehensive Work Plan for Energy Saving and Emission Reduction,” key industries must achieve the dual goals of “deep treatment of pollutants + high-efficiency utilization of energy.” Traditional single treatment technologies (for example, wet scrubbing, electrostatic dust removal) are limited by “low treatment efficiency, high risk of secondary pollution, significant energy consumption,” and thus it has already become difficult for them to meet strict environmental protection standards.

The Hybrid Electrochemical Scrubber Apparatus Device, researched and developed in 2024, innovatively integrates the “three-way special water-retaining physical separation technology” and the “multi-layer electrode electrochemical oxidation-reduction technology,” thereby breaking through the three major technological bottlenecks of “gas-liquid collaborative treatment,” “simultaneous removal of multiple pollutants,” and “resource recycling.” It can integrally treat multiple kinds of pollutants such as dust, VOCs, oil mist, oils, heavy metals, and ammonia nitrogen. After treatment, the indices of waste gas and wastewater all conform to the “Comprehensive Emission Standards of Air Pollutants,” the “Comprehensive Emission Standards of Wastewater,” as well as the requirements of the international ESG (Environment, Society, Governance) framework, providing sustainable pollution treatment solutions for industries such as semiconductors, chemical industry, and machining.

II. Core Technical System: Principles of Physical Separation and Electrochemical Collaboration

(1) Sanpotec Special Water-Retaining Physical Separation Technology

This technology, based on fluid mechanics and gravitational settling theory, realizes preliminary capture of pollutants through a three-stage structure of “stable pressure – vortex scrubbing – gas-liquid separation.” It does not require additional energy-consuming devices and conforms to the technical requirements of industrial energy-saving equipment.

1. Technical Principle and Structural Design

Stable Pressure Intake Stage: Waste gas enters the stable pressure chamber under negative/positive pressure driving. The chamber expands the cross-sectional area, slowing down and stabilizing the flow, thereby making the airflow distribution uniform, avoiding airflow disturbance from affecting subsequent scrubbing efficiency, and reducing pressure loss.
Vortex Scrubbing Stage: The airflow enters the spiral vortex scrubbing chamber, forming a “gas-liquid vortex flow” with scrubbing water injected tangentially. The droplet size of the water mist is sheared to ≤50 μm, the gas-liquid contact area increases by 10–30 times compared with traditional scrubbers, and the contact time is extended to 2–3 seconds (traditional scrubbers only 0.5–1 second). According to mass transfer kinetics theory (Lewis-Whitman two-film theory), with this structure, the removal rate of dust (particle size ≥1 μm) reaches more than 90%, and the capture rate of polar VOCs (alcohols, aldehydes) reaches 70%–90%.
Gas-Liquid Separation Stage: The scrubbed gas enters the pressure-reducing and decelerating chamber. The water mist settles under gravity back to the tank, and clean gas is discharged through a demisting plate. This process conforms to Stokes’ law of settling, with a liquid separation efficiency greater than 98%, preventing carryover pollution by secondary droplets.

2. Technical Advantages and Comparison with Traditional Scrubbing Towers

Technical Indicator	Three-Way Special Water-Retaining Scrubbing Equipment	Traditional Packed Scrubbing Tower	Supporting Standard / Theoretical Basis
Energy Consumption (for 1000 m³/h waste gas treatment)	No additional energy consumption	Requires 3–5 kW circulating water pump + additional fan load	“Guidelines for Energy Measurement of Energy-Using Equipment”
Maintenance Cycle	180–360 days	30–60 days (nozzle/packing replacement)	Industrial Equipment Maintenance Management Code
Dust Removal Rate (≥1 μm)	≥90%	60%–70% (easy clogging)	“Bag Filter Performance Test Method”
Consumables Requirement	None (no nozzle, no packing)	Requires periodic replacement of Raschig rings/nozzles	Law on Prevention and Control of Solid Waste Pollution

(2) Multi-Layer Electrode Electrochemical Deep Degradation Technology

Based on electrochemical oxidation-reduction theory, through the synergistic action of “anode metal ion release – cathode free radical generation – pulse current enhancement,” deep decomposition of liquid-phase pollutants is realized.

1. Core Electrochemical Principles

Anode Reaction: A composite anode of iron/aluminum is adopted. After electrification, oxidative dissolution occurs:
Fe – 2e⁻ = Fe²⁺, Al – 3e⁻ = Al³⁺.
Fe²⁺ under acidic conditions is further oxidized into Fe³⁺ (4Fe²⁺ + O₂ + 4H⁺ = 4Fe³⁺ + 2H₂O). Fe³⁺ can oxidize organic pollutants such as aldehydes and ketones. For example, decomposition of formaldehyde:
HCHO + 2Fe³⁺ + H₂O = CO₂↑ + 2Fe²⁺ + 4H⁺.
(Refer to U.S. “Electrochemical Engineering Handbook,” 3rd Edition, “Metal Ion Catalytic Oxidation Mechanism”).
Cathode Reaction: At the metal cathode, water electrolysis reduction occurs:
2H₂O + 2e⁻ = H₂↑ + 2OH⁻.
At the same time, under a strong electric field (5–20 V), hydroxyl radicals (·OH, redox potential 2.8 V) are generated. ·OH non-selectively destroys stable structures such as benzene rings and ester groups.
Example: Toluene decomposition pathway C₇H₈ + 16·OH = 7CO₂↑ + 12H₂O.
Decomposition efficiency is 3–5 times that of traditional chemical oxidation (Japan “White Paper on Industrial Oil Mist Treatment Technology,” 2023 edition).
Pulse Current Enhancement: By applying high-frequency pulse current (duty ratio 30%–70%), instantaneous high voltage breaks chemical bonds of pollutant molecules. ·OH concentration increases 2–4 times, simultaneously preventing electrode passivation (traditional DC electrolysis has a passivation rate of 30% per month). Reaction time is shortened to the millisecond level, conforming to EU CE certification “Pulse Electrochemical Treatment Technology” standard (EN 61010-2-061:2015).

2. Intelligent and Energy-Saving Design

Realization of precise operation by fuzzy control technology:
This technology, based on parameters such as the operating condition of the equipment and the concentration of pollutants, can automatically adjust the operating state of the equipment and realize precise operation.
Automated operation reduces the necessity of human labor, decreases interference to equipment operation caused by human factors, and improves the stability and reliability of equipment operation.
High-efficiency energy consumption design:
On the premise of treating pollutants with high efficiency, energy consumption is reduced to the maximum extent.
At the same time, by modularization, operation is simplified, and installation, adjustment, and maintenance of equipment are made more convenient.
This design not only conforms to the current needs of enterprises for energy saving and emission reduction, but also reduces the operating cost of enterprises.
It conforms to the ESG (Environment, Society, Governance) standards for energy saving and emission reduction, and contributes to the improvement of the sustainable development ability and social image of enterprises.

3. Solid-Liquid Separation and Resource Recycling

The gel-like precipitates Fe(OH)₃, Al(OH)₃ generated in electrochemical reaction realize solid-liquid separation through “coagulation – settling”:

Coagulation Stage: Metal hydroxides adsorb oil droplets, suspended particles, and degradation by-products in the liquid phase, forming flocs of particle size ≥100 μm. Coagulation efficiency ≥95% (according to “Water Treatment Agent – Polymerized Ferric Sulfate”).
Resource Recycling: After re-treatment by secondary arranged electrode plates, water is recycled back to the scrubbing chamber. Water recycling utilization ≥90%. A small amount of floating oil is subjected to free radical cleavage of oils by secondary arranged electrodes.

Hybrid Electrochemical Scrubber Apparatus

III. Main Pollutant Treatment Mechanism and Effect Verification

(1) VOCs Treatment: Gas-Liquid Mass Transfer – Electrochemical Cooperative Decomposition

For the common “polar + non-polar” mixed VOCs in semiconductor and printing industries (example: isopropanol, toluene), a two-stage method of “pre-capture – deep decomposition” is adopted:

Pre-capture stage:
Non-polar VOCs (example: toluene) – by adding 0.1% sodium dodecylbenzene sulfonate (surfactant), the water–VOC interfacial tension is reduced.
The solubility increases from 515 mg/L → above 1200 mg/L at 25°C (reference: Handbook of Surfactant Application Technology).
Decomposition stage:
Under pulse electrochemical action, toluene removal rate ≥85%, isopropanol removal rate ≥95%.
Liquid phase COD reduced from 280 mg/L → less than 15 mg/L.

Case Verification:
In a 12-inch wafer factory lithography process VOCs treatment project:

Initial concentration: isopropanol 80 mg/m³, toluene 50 mg/m³.
After device treatment: reduced to 3.2 mg/m³, 4.5 mg/m³.
Conforming to Air Pollutant Emission Standard for Semiconductor Industry.
Operation and maintenance cost reduced 40% compared with “activated carbon adsorption + RTO” method.

→ Comparative Advantages with Traditional VOC Treatment Technologies

The Hybrid Electrochemical Scrubber Apparatus technology is comprehensively superior to traditional single technologies (adsorption method, photocatalytic method, simple electrochemical method) in aspects such as VOC treatment efficiency, energy consumption, and operation & maintenance cost. The specific comparison is as follows:

Comparison items	Hybrid Electrochemical Scrubber Apparatus Technology	Traditional Adsorption Method (Activated Carbon)	Traditional Photocatalytic Method (UV+TiO₂)	Simple Electrochemical Method
VOC Removal Rate	Polar VOC ≥95%, Non-polar VOC ≥85%	Initial ≥80%, after 30 days drops to ≤50%	Polar VOC ≥70%, Non-polar VOC ≤50%	≥80% (but easily affected by water quality)
Applicable VOC Types	All types (polar, non-polar, high concentration)	Low concentration, mainly non-polar	Low concentration, easily oxidized types (example: aldehydes)	Medium-low concentration, water-soluble VOC
Energy Consumption (for 1000 m³/h waste gas)	5–7 kWh	3–5 kWh (but needs periodic replacement of activated carbon)	10–15 kWh (high power consumption of UV lamps)	8–12 kWh
Operation & Maintenance Cost (Annual)	No consumables, only electrode maintenance (~100,000 yen)	Activated carbon replacement (~500,000–750,000 yen)	UV lamp replacement + catalyst regeneration (~375,000 yen)	Electrode replacement + electrolyte replenishment (~350,000 yen)
Secondary Pollution Risk	None (VOCs decomposed into CO₂ and H₂O)	Waste activated carbon is hazardous waste (needs special treatment)	Possible secondary pollution such as ozone (O₃)	None (but requires treatment of electrolytic wastewater)
Stability (Continuous Operation)	365 days no failure (modular design)	Needs shutdown every 30–60 days for carbon replacement	UV lamp replacement every 90–120 days	Electrode passivation film cleaning every 60–90 days

(2) Oil Mist / Oil Treatment: Vortex Demulsification – Electrochemical Decomposition

For oil mist (1–10 μm) and oil pollution in machining and food industries, a “physical demulsification – chemical decomposition – solid-liquid separation” technical route is adopted:

Physical demulsification:
Vortex flow shear force destroys oil-in-water (O/W) emulsion system. Oil droplets >5 μm coagulate and float. Capture rate 70%–85% (conforming to Germany DIN 1946-4 Technical Code for Industrial Cleaning Equipment).
Electrochemical decomposition:
Array electrodes break the ester bonds (C–O–C) of oils with ·OH. Long-chain fatty acids (example: stearic acid C₁₈H₃₆O₂) decompose into acetic acid (C₂H₄O₂). Malodorous substances (hexanal, nonanal) removal rate ≥92%.
Solid-liquid separation:
Fe(OH)₃ adsorbs residual oil droplets. After floc sedimentation, wastewater oil content ≤5 mg/L.

Case Verification:
In automobile engine machining plant oil mist treatment:

Initial oil mist concentration 80–120 mg/m³, odor intensity 4–5 level.
After treatment: oil mist concentration 3–5 mg/m³, odor intensity 1 level.
Continuous operation for 180 days without electrode passivation.
Operation and maintenance cost less than 1/3 of traditional electrostatic oil removal equipment.

(3) Ammonia Nitrogen (NH₄⁺) Treatment: Gas-Liquid Absorption – Redox Cooperation

For NH₃ / NH₄⁺ pollution in semiconductor CMP process and chemical industry, a cooperative technology of “absorption – decomposition” is applied:

Gas phase absorption:
NH₃ dissolves into aqueous phase through vortex washing (capture rate ≥92%), ionizes into NH₄⁺.
Electrochemical decomposition:
- At anode: Cl· oxidizes NH₄⁺ into NO₂⁻ (NH₄⁺ + 3Cl· → HNO₂ + 5H⁺ + 3Cl⁻).
- At cathode: ·OH further oxidizes into NO₃⁻.
- Finally through “breakpoint chlorination” reaction generates N₂ (NH₄⁺ + NO₂⁻ → N₂↑ + 2H₂O). Removal rate ≥97%.

Case Verification:
In one factory CMP process:

Initial NH₄⁺ concentration 180 mg/L → after treatment 3.8 mg/L.
Conforming to Water Pollutant Emission Standard for Electronic Industry.
Water recycling utilization rate 85%, average daily water saving 20 tons.

Hybrid Electrochemical Scrubber Apparatus Device Pressure Loss Advantage and Energy-Saving Effect Analysis

1. Pressure Loss Characteristics: Core Difference with Water Vortex Washer

The Hybrid Electrochemical Scrubber Apparatus Device achieves important breakthrough in fluid resistance control, and its pressure loss characteristics significantly surpass traditional water vortex washer. The specific data comparison is as follows:

Device Type	Average Pressure Loss Range (mmaq)	Core Technology for Pressure Loss Control	Data Source
Hybrid Electrochemical Scrubber Apparatus Device	≤110	1. Streamlined design of spiral vortex washing chamber reduces airflow turbulence; 2. Multi-layer electrode module arrangement avoids local stagnation of airflow; 3. In gas-liquid separation stage, low-resistance multi-layer parallel electrode	Sanfang Enterprise design basis and actual measurement technical parameters
Traditional Water Vortex Washer	≥130–280	1. Chamber structure emphasizes high turbulence to strengthen washing, airflow resistance is large; 2. Single gas-liquid separation unit requires high wind speed, increasing pressure loss	Industry standard water vortex device test data

From fluid dynamics principle:
Pressure loss is essentially the energy consumed to overcome frictional resistance and local resistance when airflow passes through the device.
The Hybrid Electrochemical Scrubber Apparatus Device, through structural optimization, controls airflow turbulence at the balance point of “high-efficiency mass transfer – low-resistance operation.”
While maintaining gas-liquid contact efficiency of spiral vortex washing (dust removal rate ≥90%, VOCs pre-capture rate 70%–90%), through streamlined chamber and low-resistance parallel electrode design, pressure loss is stably controlled below 110 mmaq, reducing energy consumption of airflow transportation from the source.

2. Relationship Mechanism between Pressure Loss and Energy Consumption: Theoretical Basis and Actual Impact

According to fluid dynamics and fan energy consumption calculation formula (Fan shaft power P = (Q × ΔP)/(6120 × η), Q is air volume (m³/min), ΔP is pressure loss (mmaq), η is fan efficiency):
Pressure loss (ΔP) is positively correlated with fan energy consumption.
When air volume and fan efficiency are fixed, pressure loss decreases by 10%, fan energy consumption decreases by 8%–10%.

Based on the pressure loss difference of both devices, under typical operation condition (air volume 166 m³/min, fan efficiency 70%), energy consumption is quantitatively calculated:

Composite device energy consumption:
ΔP = 110 mmaq → P₁ = (166 × 110)/(6120 × 0.7) ≈ 4.3 kW
Traditional water vortex washer energy consumption:
ΔP = 280 mmaq → P₂ = (166 × 280)/(6120 × 0.7) ≈ 10.9 kW

Under same condition, fan energy consumption of composite device is about 60.6% lower than traditional water vortex washer.
That is, “the lower the pressure loss, the more power-saving” – this core logic is verified, showing that pressure loss reduction directly reduces energy consumption of fan-driven airflow.
This result fully coincides with the “energy-saving, environmental protection, energy-conservation” technical advantage of the composite water-washing electric-energy air purification dust-removal device.

IV. Industry Application Suitability and Market Value

(1) Key Industry Application Scenarios

Industry	Main Pollutants	Device Application Advantage
Semiconductor / Electronic Manufacturing	VOCs, dust, NH₄⁺, fluorides	Modular design adapts to clean factory, no microbial pollution risk
Chemical / Pharmaceutical	Multi-component VOCs, heavy metals, odor	Corrosion-resistant electrode (Ti-based coating), adapts to strong acid / strong alkali environment
Machining	Metal cutting fluid oil mist, dust	Consumable-free design avoids equipment downtime due to filter clogging
Food Processing / Catering	Edible oil mist, frying odor	Oil recovery rate ≥80%, no secondary waste oil pollution

(2) ESG Suitability and Investment Return

ESG Index Compliance:
Device energy consumption 50%–70% lower than traditional, water resource recycling rate ≥80%, no hazardous waste (waste activated carbon, waste filler).
Conforms to UN Global Compact (UNGC) ESG disclosure framework, EU Sustainable Finance Disclosure Regulation (SFDR).
Investment Return Analysis:
- For 10-year operation cycle: initial investment 30%–50% higher than traditional.
- But through power saving (100,000–150,000 kWh/year), operation & maintenance cost reduction (1.25–1.75 million yuan/year), environmental penalty avoidance (per time 3–17 million yuan), the investment payback period shortens to 2–3 years.
- Total cost 30%–50% lower than traditional (reference: Economic Evaluation Method of Industrial Environmental Protection Equipment).

V. Conclusion and Outlook

The Composite Water-Washing Electric-Energy Air Purification Dust-Removal Device, through a cooperative technical system of “physical separation – electrochemical decomposition – resource recycling,” solves the problems of “single pollutant treatment, high energy consumption, high maintenance” of traditional environmental equipment, realizing integrated treatment of multiple industries and multiple pollutants.

Its technical advantages are shown as follows:

High Economic Sustainability:
Through energy-saving and resource recycling design, long-term operation cost is reduced, investment return effect is remarkable.

Sufficient Theoretical Support:
Integrating multidisciplinary theories of fluid dynamics, electrochemistry, and mass transfer kinetics, technical parameters can be quantitatively calculated with theoretical model.

High Regulatory Compliance:
Treatment effect conforms to national and industry environmental standards, corresponds to ESG system requirements.

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