Resource Recovery from Hazardous Waste
CPCB Rule 9 Utilization Framework, Standard Operating Procedures, Industrial Waste Utilization and a Gujarat Resource-Recovery Success Story
Resource recovery from hazardous and other wastes is an important approach for reducing dependence on disposal and recovering useful materials or resources from industrial waste streams. The CPCB framework describes utilization under Rule 9 of the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016 , including CPCB's Standard Operating Procedure framework for approved utilization routes.
📑 Table of Contents
- What is Resource Recovery from Hazardous Waste?
- Rule 9 and Hazardous Waste Utilization
- CPCB Standard Operating Procedure Framework
- CPCB Utilization Data
- CPCB Guidelines for HOWM Rules
- Waste vs By-Product Identification
- Resource Recovery Process
- Gujarat Spent Acid Case Study
- CPCB SOP Examples
- Hazardous Waste Streams and Recovery Routes
- EHS Considerations
- Practical EHS Checklist
- Conclusion
1. What is Resource Recovery from Hazardous Waste?
Resource recovery means identifying suitable opportunities to recover useful materials, products, energy or other resources from waste instead of treating the waste only as material requiring disposal.
Under the CPCB framework, hazardous-waste utilization is linked to the provisions of Rule 9 of the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016.
The CPCB framework provides for utilization proposals are evaluated and, where a suitable SOP has not already been prepared, a trial run can be conducted for a particular waste and particular utilization.
Waste Utilization
Suitable hazardous and other wastes can be utilized as resources or for other approved uses under the prescribed regulatory framework.
Industrial Resource Recovery
Industrial residues can potentially become useful inputs, recovered materials, fuels or other resources when an approved utilization route exists.
Reduced Disposal
CPCB reports that utilization under Rule 9 has reduced disposal of hazardous waste in secured landfills.
2. Rule 9 and Utilization of Hazardous Waste
Rule 9 of the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016 provides the regulatory basis discussed in the CPCB document for utilization of hazardous and other wastes.
According to the document, CPCB prepares Standard Operating Procedures for utilization of hazardous waste based on utilization proposals received from applicants where an SOP has not previously been prepared.
Trial Run and Compliance Demonstration
Where required, a trial run is conducted for the particular waste in relation to the proposed utilization. The objective is to demonstrate compliance with applicable environmental standards during the trial.
Upon demonstration of compliance during the trial run, CPCB develops an SOP for utilization of that particular hazardous waste as a resource or for another permitted use, other than co-processing in a cement kiln as stated in the document.
Hazardous-waste utilization is not simply a matter of finding a possible use for a waste. The utilization route has to be supported by the applicable regulatory framework, technical evaluation and environmental compliance demonstration described by CPCB.
3. CPCB Standard Operating Procedure Framework
The CPCB document states that Standard Operating Procedures are prepared for different categories of hazardous waste and their intended utilization routes.
The prepared SOPs are circulated to State Pollution Control Boards and Pollution Control Committees for enforcement.
4. CPCB Hazardous-Waste Utilization Data
The National Hazardous Waste Inventory Report for 2017–18 reported 480 authorized utilizers utilizing hazardous waste under SOPs prepared under Rule 9.
Their authorized capacity was reported as 1.95 million MT , while approximately 0.34 million MT of hazardous waste had been utilized.
| Indicator | Reported Figure | Significance |
|---|---|---|
| Authorized Utilizers | 480 | Utilizers operating under the SOP-based utilization framework. |
| Authorized Capacity | 1.95 Million MT | Aggregate authorized utilization capacity reported in the cited inventory. |
| Hazardous Waste Utilized | 0.34 Million MT | Quantity of hazardous waste reported as utilized. |
| Disposal Impact | Reduced secured-landfill disposal | CPCB identifies utilization as a a means of reducing disposal of hazardous waste in secured landfills. |
5. CPCB Guidelines for Effective Implementation of HOWM Rules
CPCB has prepared technical guidelines relating to identification, management and handling of hazardous waste, impact assessment, upkeep, monitoring and operation of hazardous-waste management facilities and enforcement of the HOWM Rules, 2016.
Waste Identification
Identification and classification of materials generated from industrial processes.
Facility Management
Proper upkeep, monitoring and operation of hazardous waste management facilities.
Environmental Assessment
Technical guidance related to impact assessment and environmental management.
6. Waste vs By-Product: Why Identification Matters
CPCB also refers to the Guidelines on Framework on Identification of Materials Generated from Industrial Processes as Wastes or By-products, 2019 .
The guideline provides criteria for identifying material generated from industrial processes as either waste or by-product .
The objective is to provide clearer differentiation between product, by-product and waste so that useful by-products can be separated from waste and the burden of disposal can be reduced.
| Material Classification | Concept | Resource-Recovery Relevance |
|---|---|---|
| Product | Intended output of the industrial process. | Normal production output. |
| By-Product | Material generated alongside the primary product that may have a useful application under applicable criteria. | Potential opportunity for productive use rather than disposal. |
| Waste | Material requiring management under the applicable waste framework. | May require treatment, disposal or an approved utilization route. |
7. How Hazardous Waste Resource Recovery Works
Under the CPCB framework, resource recovery can be understood as a controlled sequence in which an industrial waste stream is evaluated for a technically and environmentally suitable utilization route.
Identify the Waste
Determine the nature, source and characteristics of the industrial waste stream.
Identify Potential Use
Assess whether the material can be utilized as a resource or for another suitable application.
Technical Evaluation
Evaluate the proposed utilization route against applicable environmental requirements.
Trial Run
Where applicable, demonstrate environmental compliance during a trial run.
SOP Development
CPCB develops the relevant SOP after successful demonstration of the utilization route.
Controlled Utilization
The utilization route is implemented under the applicable authorization and regulatory controls.
8. Gujarat Success Case Study: Spent Acid Resource Recovery
Novel Spent Acid Management Facility
The CPCB publication presents a success case study shared by Gujarat PCB involving management of spent acid generated from dyes, dye intermediates and other chemicals.
The spent acid is described as normally containing approximately 20–30% sulphuric acid .
The process generates chemical gypsum with approximately 80% purity , which is sent to cement manufacturing units for resource recovery.
Facility Details
| Parameter | Reported Detail |
|---|---|
| Facility commissioned | December 2009 |
| Total project cost | Rs. 30 Crore |
| Permitted spent-acid utilization | 2,70,000 MTPA |
| Chemical gypsum production | 1,47,600 MTPA |
| Current spent-acid receipt | Approximately 700 MT/day |
| Neutralization materials | Limestone powder and hydrated lime |
| Wastewater treatment | In-house ETP followed by CETP treatment |
| Gypsum storage | 50,000 MT storage area |
| Member units | 207 |
| Chemical gypsum sent to cement plants | Approximately 4.45 lakh MT since December 2009 |
The case study demonstrates a resource-recovery pathway in which spent acid is managed through a controlled process and the resulting chemical gypsum is supplied to cement manufacturing units.
9. CPCB SOP Examples for Hazardous-Waste Utilization
Annexure I provides a list of SOPs prepared by CPCB for utilization of hazardous waste under Rule 9 of the HOWM Rules, 2016.
The table below summarises the entries presented in Annexure I. The intended utilization shown should not be interpreted as a general permission for utilization outside the applicable regulatory framework.
| No. | Hazardous Waste | Source of Generation | Type of Utilization / Intended Use |
|---|---|---|---|
| 1 | Spent solvent containing toluene, xylene, cyclohexane, acetone, methanol and other solvents | Industrial solvents; dyes, pharmaceuticals, healthcare products and pesticide-related production | Recovered solvents / mixed solvents for industrial use |
| 2 | APCD dust / residue | LD furnace, EAF, blast furnace, captive blast furnace and ferro-alloy plant | Briquettes for further use in blast furnace to produce pig iron |
| 3 | Spent catalyst containing precious metals and ETP sludge containing platinum | Petrochemical process, pyrolytic operation, petroleum refining, acid, fertilizer, pharmaceutical and ETP operations | Recovery of precious metals including platinum, iridium, osmium, palladium, rhodium, ruthenium, rhenium, gold and silver |
| 4 | Spent H₂SO₄ | Pickling operations of MS rods / sheets | Ferrous sulphate for industrial purposes |
| 5 | Spent acid containing molybdenum | Filament and bulb industry | Molybdenum trioxide |
| 6 | Spent HCl | Metal surface cleaning in steel and rolling industry | Ferric chloride for industrial purposes |
| 7 | Used anode butt | Aluminium smelter units | Carbon pellets and high-energy coke for steel furnaces / foundries |
| 8 | Used anode butt | Aluminium smelter units | Carbon blended coke / electrode carbon paste / carburizer |
| 9 | Used anode butt — pre-processed | Aluminium smelter units | Green anodes for aluminium smelters |
| 10 | Used anode butt — pre-processed | Aluminium smelter units | Carbon electrode paste for ferro-alloy plants |
| 11 | Coal tar / tarry residue | Coal gasifier units | Supplementary fuel in furnace of sodium silicate units |
| 12 | Contaminated containers / barrels / drums | Pharmaceutical, food processing, cosmetic, textile, paint and beverage industries | Cleaned barrels and drums for industrial use / plastic granules |
| 13 | Process and primary sludge of ETP | Paper and pulp industry | Paper board / mill board / card board |
| 14 | Aluminium dross | Refining and casting house of aluminium smelter units | Recovery of aluminium metal — captive use |
| 15 | Aluminium dross | Refining and casting house of aluminium smelter units | Recovery of aluminium metal |
| 16 | Oil-based iron sludge | Grinding mill section of ball and roller bearings | Ferrous sulphate for industrial purposes |
| 17 | Spent catalyst containing mercury and mercury waste | Various industries | Mercury |
| 18 | Spent H₂SO₄ containing organic compounds | Dye and dye-intermediate units | Chemical gypsum for use in cement plants |
| 19 | Spent fixer / hypo solution | Photography / X-ray films | Silver metal for various uses |
| 20 | Hydrofluorosilicic acid / acidic scrubber solution | Single Super Phosphate manufacturing industry | Recovered sodium silicofluoride for glass industry |
| 21 | Spent sulphuric acid | Para nitro toluene ortho sulfonic acid / oxadiargyl / anthraquinone manufacturing | Ferrous sulphate |
| 22 | Vanadium sludge | Alumina refineries | Vanadium metal |
| 23 | Phenolic wastewater | Coal gasifier condensate water | Quenching of hot gases in after-burning chamber of DRI kiln |
| 24 | Chemical primary sludge of ETP | Pulp and paper industry | Energy recovery in AFBC, PFBC or CFBC boilers for steam / electricity generation |
| 25 | Spent carbon / carbon slurry | Urea manufacturing plant | Quenching of carbon slurry in reactor for manufacturing carbon black |
| 26 | Spent acid containing molybdenum compounds | Bulb filament manufacturing industries | Ammonium molybdate |
| 27 | Resin waste — mixture of Bisphenol A and Epichlorohydrin | Resin impregnation of electrical coils and power / hydro equipment industries | High-tension / low-tension insulators |
| 28 | Spent alumina | Polymerization in SWING unit of petrochemical plant | Refractory materials such as insulation bricks, mortar, castables and high-alumina bricks |
| 29 | Spent ion-exchange resin | Demineralization plant | Energy recovery in boiler for steam or power generation |
| 30 | Spent ion-exchange resin | Demineralization plant | Energy recovery in DRI kiln of sponge iron industry |
| 31 | Tungsten scrap | Metal cutting operation, mining tool buttons and worn-out drills | Manufacturing tungsten carbide powder |
| 32 | Spent pot lining | Primary aluminium production from alumina smelting industries | Supplementary resource for carbon mineral fuel manufacturing |
| 33 | Spent sulphuric acid | Manufacturing of 4,4-diaminobenzene sulphanilide | Isolation and purification of 2-NADSFA and 6-Acetyl APSA |
| 34 | Coal tar / tarry residue | Coal gasifier units | Supplementary fuel for energy recovery in frit manufacturing units |
| 35 | Gasifier slag containing nickel and spent catalyst containing molybdenum | Nitrogenous fertilizer industry | Manufacturing alloy steel and stainless-steel ingots |
| 36 | Synthetic oil-based mud / drill cuttings | Oil and natural-gas exploration | Road construction / oil recovery |
| 37 | Flue-gas cleaning residue | Bag filter connected to steel-scrap melting induction furnace | Zinc metal extraction |
| 38 | Spent sulphuric acid and spent sodium thiosulphate | Specified chemical manufacturing processes | Manufacturing of nitrosyl sulphuric acid |
| 39 | Spent phosphoric acid | Specified manufacturing process | Dibasic calcium phosphate |
| 40 | Spent sulphuric acid | Vinyl sulphone manufacturing | Production of H-acid |
| 41 | Waste dichromate solution | Ibuprofen manufacturing | Production of basic chromium sulphate |
| 42 | Used waste thinner | Cleaning of paint-feeding lines using solvents | Industrial primer for automotive paints |
| 43 | Spent aluminium chloride | Production of CPC Green and related chemical process | Supplementary resource for aluminium hydroxide chloride / poly aluminium chloride for ETP and paper industry |
| 44 | Spent sulphuric acid | Manufacturing of G-Salt | R-Complex and Gamma-acid production |
| 45 | Spent ammonium chloride | Manufacturing of hexamethyl disilazane | Production of ammonium chloride |
| 46 | Spent sulphuric acid | Manufacturing of DABSA | Manufacturing Para Amino Benzene Sulphonic Acid |
| 47 | Spent liquid Glauber salt | Ethoxylation step of para-base vinyl sulphone manufacturing | Manufacturing reactive dye |
| 48 | Spent alkali bromide and spent acid bromide | Pesticides, pharmaceuticals and organic chemicals | Production of liquid bromine |
| 49 | Spent sulphuric acid | Dyes, dye intermediates and chemical manufacturing | Neutralizing agent in CETP / ETP |
| 50 | Spent ammonium carbonate | CPC Blue manufacturing | Manufacturing copper-zinc carbonate and copper carbonate |
| 51 | Spent aluminium dross residue / rejects | Aluminium smelting process | Production of calcium aluminate / synthetic slag |
| 52 | Tarry residue waste | Coal gasifier unit | Production of creosote oils and coal-tar pitch |
| 53 | Spent sulphuric acid | Dyes and dye-intermediate industries | Production of another dye and dye-intermediate product |
| 54 | Aluminium dross residues | Aluminium dross reprocessing units | Manufacturing of alum |
10. Major Resource-Recovery Pathways Identified in the SOP List
The 54 entries in Annexure I demonstrate that hazardous-waste utilization can involve several different resource-recovery pathways.
Metal Recovery
The SOP list includes recovery of aluminium, tungsten, zinc, mercury, vanadium, silver, precious metals and other metal-containing resources.
Chemical Recovery
Examples include ferrous sulphate, ferric chloride, ammonium molybdate, chemical gypsum and other chemical products.
Energy Recovery
Certain residues and spent materials are identified for energy recovery in boilers, furnaces or specified industrial applications.
Construction Materials
Certain industrial residues are identified for refractory materials, boards, insulators and other material applications.
Industrial Inputs
Some recovered materials are intended for use as industrial inputs or supplementary resources.
Process Integration
Certain wastes are routed back into industrial processes where the documented SOP identifies such utilization.
11. EHS Considerations in Hazardous-Waste Resource Recovery
Resource recovery does not eliminate the hazardous nature of a waste merely because the material has a potential utilization route. From an EHS perspective, the waste must continue to be managed under the applicable controls until it reaches the approved utilization pathway.
Why traceability matters
A resource-recovery system should maintain clear traceability from the generation point through storage, transportation, processing and final utilization. This supports environmental compliance and helps demonstrate that hazardous waste has been managed through the intended route.
12. Practical Resource-Recovery Compliance Checklist
13. Lessons from the Gujarat Resource-Recovery Case Study
Waste as a Resource
The spent-acid case demonstrates how an industrial waste stream can be processed toward a useful material rather than relying solely on disposal.
Process Control
The facility uses neutralization and wastewater treatment infrastructure as part of its management process.
Downstream Utilization
Chemical gypsum generated through the process is supplied to cement manufacturing units.
14. Conclusion
The CPCB publication demonstrates the role of resource recovery in hazardous and other waste management under the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016.
Rule 9 provides the framework discussed for utilization of hazardous and other wastes, while CPCB's SOP mechanism provides defined utilization routes for different waste streams.
The 54 SOP entries presented in Annexure I demonstrate the wide range of potential recovery pathways, including recovery of metals and chemicals, energy recovery, construction-material applications and industrial process utilization.
The Gujarat spent-acid case study further demonstrates how a controlled waste-utilization process can convert an industrial waste stream into chemical gypsum for use in cement manufacturing.
EHS takeaway: Resource recovery should be approached as a regulated, technically evaluated and environmentally controlled utilization pathway — not simply as an alternative method of waste disposal.
📄 Source Document
This article is based on the CPCB publication titled “Success Stories for Environment Pollution Mitigation — Hazardous and Other Wastes Management” .
The publication discusses utilization of hazardous and other wastes under Rule 9 of the Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016, CPCB SOPs, guidelines and the Gujarat resource-recovery case study.
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