ETP Manufacturer & Supplier — Raipur, Chhattisgarh
Turnkey effluent treatment plants for Raipur's sponge iron, steel re-rolling, ferro-alloy, rice processing, and engineering industries — CGEPCB-compliant ETP and ZLD systems across Urla and Siltara industrial areas
Industry Overview
ETP Manufacturer & Supplier — Raipur, Chhattisgarh
Raipur is the state capital and primary industrial city of Chhattisgarh, sitting at the heart of one of India's most mineral-rich regions. The city and surrounding Raipur district host one of the highest concentrations of sponge iron (DRI — Direct Reduced Iron) plants, steel re-rolling mills, ferro-alloy producers, and downstream metal-working industries in India. Urla Industrial Area and Siltara Industrial Area — both developed by CSIDC (Chhattisgarh State Industrial Development Corporation) — are the two principal organised industrial estates, housing steel, engineering, and diversified manufacturing units. Proximity to iron ore deposits in Dantewada and Durg districts, and to coal fields in Korea and Korba, make Raipur the focal point of Chhattisgarh's dominant steel and power generation sectors.
Beyond the steel-heavy industrial core, Raipur's industrial profile includes significant rice and paddy processing — Chhattisgarh is one of India's largest rice-producing states and Raipur is a major rice trade and processing centre — along with food processing (soybean, dal, edible oil), and general engineering manufacturing. CGEPCB (Chhattisgarh Environment Protection Board) exercises environmental regulatory jurisdiction, with the Sheonath and Kharun rivers — tributaries of the Mahanadi — as the primary receiving water bodies. CGEPCB enforces CPCB General Standards for effluent discharge, and the steel and ferro-alloy industrial cluster's heavy water use and complex effluent streams make ETP compliance a high-priority operational requirement for Raipur industrial units.
Spans Envirotech delivers ETP and ZLD EPC projects across central India and pan-India. Our capability in steel plant wastewater treatment — covering the distinct streams of pickling rinse water, oily rolling mill effluent, cooling tower blowdown, and dust scrubber water — along with rice mill and food processing ETP experience, positions us well for Raipur's multi-sector industrial base. We provide full turnkey services: CGEPCB consent support (CTE and CTO), process design, equipment supply, civil coordination, commissioning, and post-commissioning AMC.
Industry Challenges
Key Environmental Challenges
Acidic Pickling Rinse Water from Steel Re-Rolling
Steel re-rolling mills in Raipur use hydrochloric or sulphuric acid pickling to remove mill scale and surface oxides from steel coils before rolling. Spent pickle liquor and acid rinse water (pH 1–3, high iron, dissolved solids) require acid neutralisation with lime, iron hydroxide precipitation, and clarification before biological polishing. Spent acid recovery or disposal is a secondary challenge — ETPs must be designed for both the spent acid stream and the dilute rinse water at different concentrations.
Oily Wastewater and Mill Scale from Rolling Mills
Hot and cold rolling operations generate oily process water containing emulsified rolling oil, mill scale (iron oxide particles), and hydraulic oil leaks. High suspended solids from mill scale can clog downstream biological systems if not removed in primary treatment. DAF or CPI/TPI separators for oil-water separation, followed by scale settling and biological polishing, are required. Scale sludge has potential for recovery as iron oxide raw material.
Cooling Tower Blowdown — High TDS, Antiscalants, Biocides
Raipur's steel plants and power units rely on extensive cooling water systems. Cooling tower blowdown is a high-volume, high-TDS wastewater stream containing antiscalant chemicals, biocide residues (chlorine compounds), and dissolved salts concentrated by evaporative cooling. TDS levels of 3,000–8,000 mg/L in blowdown require ZLD treatment (RO + evaporation) or dedicated high-TDS ETPs to prevent groundwater contamination through uncontrolled discharge.
Dust Scrubber Water from DRI and Blast Furnace Gas Cleaning
DRI (sponge iron) plants and blast furnace gas cleaning systems use wet scrubbers that generate high-volume, high-suspended-solids water loaded with fine iron oxide dust and process gas impurities. These streams require primary sedimentation, coagulation-flocculation, and clarification before discharge. Sludge from scrubber water treatment — iron oxide cake — is often recyclable as iron ore feedstock.
Rice Mill and Food Processing High-BOD Effluent
Raipur's rice processing industry generates effluent with high BOD from rice starch, bran washing, and process washings. BOD levels of 800–3,000 mg/L are typical in raw rice mill effluent. Food processing units (soybean, dal, edible oil) add high-FOG streams. Biological treatment (MBBR or activated sludge) with appropriate FOG pre-removal (DAF) is required, and the effluent volumes and seasonal rice harvest cycles demand adequate equalisation capacity.
Fly Ash and Power Plant Leachate Management
Power plants adjacent to Raipur's industrial areas generate fly ash pond leachate containing high TDS, suspended solids, and trace heavy metals (arsenic, selenium, boron) from fly ash dissolution. CGEPCB regulates fly ash pond management and leachate disposal. Fly ash leachate ETPs require physio-chemical treatment for heavy metal removal, high-TDS management, and in some cases ZLD to prevent leachate reaching the Sheonath and Kharun river system.
Our Solutions
Tailored Wastewater Treatment Solutions
Steel Plant ETP — Multi-Stream Treatment
Integrated ETPs for steel re-rolling and DRI plants in Raipur — segregated pre-treatment for pickling rinse water (acid neutralisation, iron precipitation), oily wastewater (DAF for oil-water separation, mill scale settling), and dust scrubber water (coagulation-flocculation, clarification). Combined biological polishing for organic residuals, and ZLD for high-TDS cooling tower blowdown. Full CGEPCB CTO compliance design.
Pickling Rinse Water Neutralisation and Treatment
Dedicated treatment systems for steel pickling effluent — lime dosing for acid neutralisation, ferrous iron oxidation and precipitation as iron hydroxide, lamella clarifier for iron sludge removal, and pH correction before discharge. Iron sludge dewatering (filter press) for sludge with potential recovery value as iron oxide. Systems designed for the batch and continuous pickling schedules of Raipur's re-rolling mills.
Rice Mill ETP — High-BOD Biological Treatment
ETPs for Raipur's rice processing mills — screening and grit removal for husk particles, equalisation for seasonal harvest cycle load variation, MBBR or UASB-based biological treatment for high-BOD reduction, secondary clarification, and sludge dewatering. Systems sized for the paddy milling season and capable of reduced-flow operation in the off-season without biological upset.
Cooling Tower Blowdown ZLD
ZLD systems for steel plant cooling tower blowdown — softening pre-treatment, Reverse Osmosis for TDS reduction and water recovery, and MEE/MVR thermal evaporation for crystalliser or ZLD disposal. Recovered RO permeate reused as cooling tower make-up water, reducing freshwater consumption and eliminating high-TDS discharge to Sheonath and Kharun river tributaries.
Food Processing ETP — DAF and Biological Treatment
ETPs for Raipur's food processing units (soybean, dal, edible oil) — DAF for primary FOG and suspended solids removal, MBBR biological treatment for BOD and COD reduction, secondary clarification, and sludge dewatering. DAF sludge (high-protein in soybean processing) may have value as animal feed supplement — handled with appropriate discharge documentation.
Ferro-Alloy and Engineering ETP — Heavy Metal and Process Water
ETPs for ferro-alloy producers and engineering manufacturing units in Urla and Siltara — heavy metal precipitation (chromium, manganese, iron), neutralisation, coagulation-flocculation for suspended solids, and biological polishing. Surface treatment effluent (passivation, phosphating) treated through physio-chemical systems to CGEPCB heavy metal discharge standards.
Technologies
Proven Technologies for Your Industry
Benefits
Why Choose Spans for Your Industry
- CGEPCB-compliant ETP and ZLD systems — CTE and CTO documentation support
- Steel plant multi-stream ETP expertise: pickling, oily wastewater, cooling tower blowdown
- Rice mill and food processing high-BOD biological treatment experience
- ZLD for cooling tower blowdown — water reuse and Mahanadi basin protection
- DAF-based oil-water separation for rolling mill and engineering effluent
- Heavy metal treatment for ferro-alloy and surface treatment effluent
- Turnkey EPC from process design to commissioning and AMC
- Post-commissioning AMC for ongoing CGEPCB compliance
- Founded 1993 — 30+ years of pan-India ETP and ZLD delivery
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