Dechlorination — Process Challenge

脱塩素処理(残留塩素除去)

プラントはNPDES放流前、または塩素に敏感なRO・ナノフィルトレーション膜に到達する前に、残留遊離塩素および結合塩素を中和する必要があります。買い手は計量システムを通じて亜硫酸塩系還元剤をバルク投与しており、ピロ亜硫酸ナトリウムが大規模な定期購入品目となっています
Updated Jun 2026
ソリューションアプローチ

RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.

Typical Treatment Workflow
1
Water & System Assessment
Characterize the water and the system — hardness, alkalinity, pH, TDS/conductivity, microbial load, and the metallurgy and temperatures of the equipment being protected.
2
Program & Chemistry Selection
Match coagulants, flocculants, scale and corrosion inhibitors, biocides, or pH adjusters to the water profile and discharge limits, factoring compatibility with any existing program.
3
Jar Testing & Dosing
Confirm coagulant and flocculant dose and feed point by jar test, set inhibitor and biocide treat rates, and size packaging (drums, totes, bulk) to consumption.
4
Monitoring & Control
Track residuals, turbidity, ORP, corrosion coupons, and effluent compliance, adjusting chemistry and dose as feedwater and load change.
Recommended Chemistries (6)
Sodium Bisulfite
CAS 7631-90-5
特殊添加剤
Liquid sulfite scavenger
3260 (SODIUM BISULFITE) · Class
In catalog. Bisulfite reduces free chlorine/hypochlorite to chloride and is oxidized to sulfate, removing chlorine residual in seconds
融点:Decomposes   沸点:Decomposes   密度:1.48 at 20 °C
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Potassium Metabisulfite (Technical/Food Grade)
CAS 16731-55-8
特殊添加剤
防腐
1759 (POTASSIUM METABISULFITE) · Class
In catalog. Dissolves to release bisulfite, the active reductant for chlorine removal; dry form is convenient for makedown
融点:Decomposes at approximately 150 °C   密度:2.3 g/cu cm   Solubility: Freely soluble in water; insoluble in alcohol
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Sodium thiosulfate
CAS 7772-98-7
酸・塩類
防腐
In catalog. Mild reductant that quenches chlorine and chloramine, favored where over-reduction of dissolved oxygen must be avoided
融点:48.5 °C   密度:1.667   Solubility: PRACTICALLY INSOL IN ALCOHOL
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Ammonium Bisulfite, 60%
CAS 10192-30-0
酸・塩類
Ammonium-based scavenger
2693 (AMMONIUM BISULFITE, SOLID) · Class
In catalog. Liquid bisulfite source for high-volume dechlorination and oxygen-scavenging dosing skids
融点:-10 °C   沸点:Sublimates at 150 °C   密度:2.03 at 20 °C 1.40 (72% aqueous solution)
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Sodium metabisulfite
CAS 7681-57-4
特殊添加剤
防腐
1759 (SODIUM METABISULFITE) · Class
Sourced on demand. The most-searched dechlorination active; in water it forms bisulfite that reduces chlorine to chloride
融点:> 150 °C (Decomposes)   沸点:Decomposes   密度:1.4
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Ascorbic Acid (Vitamin C), Food Grade
CAS 50-81-7
酸・塩類
防腐
Sourcing option. Reductant used where sulfite residual or pH depression must be avoided, e.g. sensitive receiving-water dechlorination
融点:190–192 °C (decomposes)   密度:1.65   Solubility: ≥ 100 mg/mL at 23 °C
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