H₂O₂ Fenton — Optimizing Fe²⁺:H₂O₂ Ratio & 500 m³/Day Calculation Example
Table of contents
| | 1 | 1:1 | 0.68 | 0.68 | | 2 | 1:2 | 0.68 | 1.36 | | 3 | 1:3 | 0.68 | 2.04 | | 4 | 1:4 | 0.68 | 2.72 | | 5 | 1:5 | 0.68 | 3.40 | | 6 | 1:1 (control) | 0 | 0 |
H₂O₂ amount calculated based on estimated COD of 1,000 mg/L. If actual COD is higher/lower, adjust proportionally.
Step 2 — Reaction mixing. Rapid mix at 200 rpm for 3 minutes, then slow mix at 40 rpm for 60 minutes. Observe color changes and gas bubbles (O₂ from excess H₂O₂).
Step 3 — Precipitation and settling. Raise pH of each beaker to 7.5–8.0 using 10% NaOH. Slow mix at 20 rpm for 10 minutes. Allow to settle for 30 minutes.
Step 4 — Measure and compare. Take clear supernatant, measure COD and color. Select the beaker with the lowest COD and most economical Fe²⁺ dose. Typically, beaker 3 or 4 (ratio 1:3 or 1:4) yields optimal results.
Jar-Test Notes
- Collect wastewater samples during peak production hours — COD fluctuates per shift
- Use actual wastewater, do not dilute — if COD > 3,000 mg/L, dilute 1:1 with distilled water
- Record wastewater temperature — high temperatures accelerate side reactions (H₂O₂ decomposition)
Technical Support & B2B Procurement Hotline
Loc Thien Chemical specializes in direct manufacturing of FeCl₂ / FeCl₃ and direct industrial supply of basic chemicals (NaOH, HCl, H₂SO₄, PAC, NaOCl, H₂O₂, FeSO₄) with direct B2B pricing and dedicated 5–30-ton tanker delivery across Vietnam.
- Hotline / Zalo: +84 979 891 929
- Official Email: [email protected]
- Direct Manufacturer: Ferrous Chloride (FeCl₂ 30%) & Ferric Chloride (FeCl₃ 38–40%)
- Primary Supplier: NaOH 32%/45%/50%/99%, HCl 32%, H₂SO₄ 98%, PAC 30–31%, NaOCl 10–12%, H₂O₂ 35%/50%
- Compliance & Quality: FeCl₂ ZDHC MRSL v3.1 test report (Smart testing, 5 substance groups, TUV Rheinland Vietnam), ISO 9001:2015, Quatest 3, Full COA & GHS SDS
Frequently Asked Questions (FAQ)
What is the optimal H₂O₂:Fe²⁺ ratio for textile dyeing wastewater?
A ratio of 1:3 to 1:4 (mol) yields 80–90% COD removal efficiency, suitable for most textile dyeing wastewater with COD 800–1,200 mg/L. A 1:2 ratio is suitable for low COD (<500 mg/L) or electroplating wastewater. Jar-testing is always recommended before application.
Why must Fenton pH be at 2.5–4.0?
pH 2.5–4.0 keeps Fe²⁺ in soluble form, optimizing its catalytic decomposition of H₂O₂ to generate ·OH. pH below 2.5 makes H₂O₂ too stable; pH above 4.0 causes iron precipitation, reducing efficiency by 50–70%. Always check pH with a pH meter, not litmus paper.
How does Loc Thien’s FeCl₂ differ from traditional FeSO₄ in Fenton?
FeCl₂ (CAS 7758-94-3) has a Fe²⁺ content of 25–30%, does not form CaSO₄ precipitate when using lime, and reduces sludge volume by 15–20% compared to FeSO₄. FeCl₂ also provides additional coagulation effects from the Fe³⁺ generated during the reaction. Color removal efficiency is 5–10% higher than FeSO₄ under the same operating conditions.
What drives the Fenton treatment cost per m³ of textile dyeing wastewater?
Chemical costs for H₂O₂ + FeCl₂ + H₂SO₄ + NaOH depend mainly on influent COD and the H₂O₂:Fe²⁺ molar ratio confirmed by jar-test. This excludes electricity (mixing, metering pumps) and sludge treatment costs.
Can FeCl₂ be reused in a Fenton system?
Fe²⁺ can be regenerated from Fe³⁺ using electrochemical methods (electro-Fenton) or reducing agents like Na₂S₂O₃. This approach is suitable for pilot-scale systems or highly variable COD. For stable-scale operations, simple batch Fenton is more efficient and effective.
Contact Us for H₂O₂ and FeCl₂ Quotes
Loc Thien supplies H₂O₂ 50% INTEROX ST 50 (Solvay Thailand) or H₂O₂ 50% South Korea — COA/MSDS per batch, density 1.196–1.198 g/cm³, and FeCl₂ 30% directly manufactured. Delivery to industrial parks nationwide via a fleet of tanker trucks (5–30 tons) and 6 warehouses (Ba Ria – Vung Tau, Dong Nai, Binh Duong, Da Nang, Can Tho and Bac Ninh).
- Hotline: 0979 891 929 — quote within 15 minutes
- Tax ID: 0313650856
- Email: [email protected]
- Website: hoachatlocthien.com
Figure: On-site chemical dosing, storage tank operation, and batch COA inspection — Source: Loc Thien Chemical.
Advanced Reaction Kinetics & Radical Stoichiometry in Industrial Fenton Processes
The classic Fenton Advanced Oxidation Process (AOP) utilizes the catalytic decomposition of Hydrogen Peroxide (H₂O₂) by ferrous iron (Fe²⁺) under acidic conditions (pH 2.8–3.2) to generate highly reactive Hydroxyl Radicals (·OH), boasting an oxidation potential of E⁰ = 2.80 V (second only to fluorine):
Kinetic Constraints and Secondary Scavenging Mechanisms
- Catalytic Chain Propagation & Iron Regeneration:
Fe³⁺ + H₂O₂ xrightarrow{k₂ = 0.001–0.01 M⁻¹s⁻¹} Fe²⁺ + ·O₂H + H⁺
Because the regeneration rate constant k₂ is four orders of magnitude slower than radical generation (k₁), continuous supplementation of Fe²⁺ (via high-purity Ferrous Chloride FeCl₂ or Ferrous Sulfate FeSO₄) is critical to sustain reaction velocity. 2. **Parasitic Radical Scavenging (Overdosing Penalty):**📦 Loc Thien's 6 Official Imported Hydrogen Peroxide (H₂O₂) Product Lines
Depending on your industry compliance requirements (Food Grade FCC/FDA, ZDHC Textile Dyeing, or Fenton Wastewater Treatment), select the dedicated H₂O₂ SKU below for batch COA/SDS and a 15-minute technical quote:
- Food & Aseptic Packaging Grade (35% FCC): INTEROX FCC 35% Food Grade Solvay Thailand (30kg Sealed HDPE Drum)
- Bulk Industrial & Tanker Supply (50%): Industrial H₂O₂ 50% Multi-Origin (30–35kg Can, 1000L IBC, 5–30 Ton Tanker)
- Thailand 50% Grade (Solvay): Thailand H₂O₂ 50% INTEROX ST 50 (ZDHC Level 1 Textile & ECF Pulp Bleaching)
- Korea 50% Grade (OCI/TaeKwang): Korea H₂O₂ 50% (High-Purity Grade for FDI Electronics & Premium Textiles)
- Taiwan 50% Grade (CCP): Taiwan Hydrogen Peroxide H₂O₂ 50% 35kg Can (Paper Pulp, Wood & PCB Processing)
- Bangladesh 50% Grade (Samuda/Tasnim): Bangladesh H₂O₂ 50% 35kg Can (Cost-Effective Fenton Oxidation & Denim Washing)
- Full Category & 6-SKU Comparison Matrix: Hydrogen Peroxide (H₂O₂ 35%–50%) Category Overview
Industrial Field Operation & Batch Quality Verification
1. Incoming Batch COA Verification & Regulatory Compliance (Law on Chemicals 69/2025/QH15)
When operating industrial water treatment, surface finishing, or textile dyeing lines in Vietnam, engineering teams must verify every chemical delivery against its batch-specific Certificate of Analysis (COA) and 16-section GHS Safety Data Sheet (SDS). Under the Vietnam Law on Chemicals No. 69/2025/QH15, Decrees 24/2026/ND-CP, 25/2026/ND-CP, and 26/2026/ND-CP, and QCVN 40:2025/BTNMT on industrial wastewater discharge:
- Specific Gravity & Assay Verification: Upon arrival of a 5–30-ton tanker or IBC tote shipment, plant QA technicians measure specific gravity at 20 °C using a calibrated hydrometer and cross-check active concentration against the batch COA issued by Loc Thien Chemical and verified via Quatest 3 (ISO/IEC 17025).
- Impurity & Heavy Metal Control: Trace heavy metals (Fe, Pb, As, Hg, Cd, Cr⁶⁺) and insoluble matter are strictly controlled to prevent catalyst poisoning in Fenton reactors, membrane fouling in RO/UF systems, or shade deviations in reactive textile dyeing.
- ZDHC MRSL v3.1 Level 1 Portfolio Boundary: For export-oriented textile and footwear FDI factories, Loc Thien Chemical maintains official ZDHC MRSL v3.1 Conformance Level 1 documentation for exactly 9 core products: four products certified by TUV SUD Product Service GmbH (
NaOH,H2O2,Na2SO4,Na2CO3) and five products verified via Conformance Summary Report (CSR) and Analytical Test Report by TUV Rheinland Vietnam (H2SO4,FeCl2,HCl,Javel/NaOCl,PAC 31%).
| Control Stage | Inspection Parameter | Test Method / Standard | Operational Target |
|---|---|---|---|
| Pre-Unloading Check | Seal integrity, UN/GHS hazard placards, batch COA & SDS | Visual & Document Audit | 100% match with delivery manifest |
| On-Site Sampling | Specific gravity (20 °C), visual clarity, pH / assay | ASTM / TCVN / Hydrometer | Within ±0.5% of COA specification |
| Dosing Skid Calibration | Metering pump stroke & frequency, back-pressure valve, ORP/pH probe | 2-Point Buffer Calibration | Dosing accuracy ±1.5%, stable effluent |
| Storage Safety Audit | HDPE/FRP tank vents, secondary containment dike (110% volume), eyewash | OSHA / Vietnam EHS | Zero vapor leak, immediate emergency readiness |
2. Dosing Optimization, Storage Materials & Preventive Maintenance
- Compatible Wetted Materials: Use cross-linked high-density polyethylene (XLPE / HDPE), polypropylene (PP-H), fiberglass-reinforced plastic (FRP with vinyl ester resin), or PTFE/PVDF-lined piping depending on corrosive and thermal conditions. Avoid unlined carbon steel or incompatible elastomers.
- Automated Dosing Control: Integrate diaphragm metering pumps with real-time pH, ORP (mV), turbidity, or conductivity sensors. Always perform a 5-beaker Jar Test whenever raw water COD, TSS, or alkalinity shifts by more than 15%.
- Secondary Containment & PPE: Storage tanks must sit inside an acid/alkali-resistant bund wall holding at least 110% of the largest tank volume. Operators handling unloading hoses must wear splash-proof chemical goggles, acid/alkali-resistant nitrile or neoprene gloves, face shields, and emergency respirators.
3. Multi-Role B2B Value Matrix (Procurement · QA/EHS Engineer · Plant Director)
- For Procurement Managers: Loc Thien Chemical is the direct manufacturer of FeCl2 30% solution and FeCl3 38–40% wastewater grade (3,000+ tons/month capacity), and a Tier-1 bulk commercial supplier of NaOH, HCl, H2SO4, PAC, NaOCl, H2O2, FeSO4, and Na2SiO3. Pricing is transparently structured around 5 technical cost drivers (active assay, packaging format, delivery distance from our 6 warehouses, order volume, and scheduled contract cadence) with a 15-minute technical quotation SLA.
- For Environmental & Process Engineers: Full technical support for Jar Test optimization, stoichiometry calculation, sludge minimization, and QCVN 40:2025/BTNMT compliance auditing.
- For FDI Plant Directors: Guaranteed supply continuity via 6 regional warehouses (Ba Ria - Vung Tau, Dong Nai, Binh Duong, Da Nang, Can Tho, Bac Ninh) and a dedicated 5–30-ton tanker fleet (4 hours in inner HCMC, 24–48 hours across Southern & Mekong Industrial Parks, 2–3 days in Northern & Central Vietnam).
4. Related Technical Resources & 15-Minute Quotation Gateway
- Explore our full industrial catalog: Industrial Chemical Catalog | Technical Knowledge Hub | Request a 15-Minute Technical Quote
- Legal Head Office: 452/6B Tinh Lo 10, Binh Tri Dong Ward, Binh Tan District, Ho Chi Minh City, Vietnam (Head Office only — all physical stock is dispatched from our 6 regional industrial park warehouses).
- 24/7 Technical Hotline: 0979 891 929 (Please contact hotline 0979 891 929 for detailed delivery procedures) | Official Email: [email protected]
Extended Engineering Calculation Example & Jar Test Protocol for H₂O₂ Fenton — Optimizing Fe²⁺:H₂O₂ Ratio & 500 m³/Day Calculation Example
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
Extended Engineering Calculation Example & Jar Test Protocol for H₂O₂ Fenton — Optimizing Fe²⁺:H₂O₂ Ratio & 500 m³/Day Calculation Example
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
Extended Engineering Calculation Example & Jar Test Protocol for H₂O₂ Fenton — Optimizing Fe²⁺:H₂O₂ Ratio & 500 m³/Day Calculation Example
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
