Processes of Chemical Waste Destruction Regionale - - PowerPoint PPT Presentation

Processes of Chemical Waste Destruction

Regionale Sondermüll-Verbrennungsanlage RSMVA Basel

• Dr. Marino Rota, Plant Chemist

International MITECO Forum Belgrade, 23 – 25 of November 2005

Presentation Overview

History of the Plant Specific Nature of Chemical Waste Declaration and Acceptance of Waste Conditioning of Waste Technology of HW Incineration Plant Figures of the Plant RSMVA Monitoring of Effluents Conclusions

Chemical Sites in Basel

Site St. Johann Site Rosental Site Schweizerhalle Site Klybeck

History of the Plant RSMVA Ciba-Geigy

Sandoz Roche Local Authorities

Ciba-Geigy

First HW Incineration Plant

RSMVA

Novartis Veolia Env. Dioxin from Seveso !!

1996 1974 1985

Special nature of Chemical Waste

Special material Low flash point Ex-safe equipment No storage Reacts with water Infectious waste Exposure of employees Dangerous for environment

Special nature of Chemical Waste

Varying composition of the waste Often pure compounds

Laboratory waste high concentration of halogens, sulfur

Reactive products (air / water)

peroxide, metal hydride, acyl halides

Every kind of consistency

solid, liquid, pasty, gaseous

Categories of Chemical Waste

Solid waste:

Filtration Residues (aqueous, organic) Distillation residues Obsolete raw materials Expired medicaments Laboratory waste (chemicals, equipment) Pesticides PCB contaminated capacitors and solids

Categories of Chemical Waste Liquid waste:

Spent solvents, halogenated and non - halogenated Mother liquors from chemical production Concentrated acids contaminated with organics Obsolete raw materials PCB contaminated oils

Categories of Chemical Waste Pasty waste:

Paint residues Organic Slurry

Gaseous waste:

Freon and Halon gases Liquefied hydrocarbons (butene) Gases in pressurized bottles

Declaration of Chemical Waste

MSDS

Waste producer EHS Department Waste Declaration Card

Declaration of Chemical Waste

Responsibility of waste producer:

EHS department Creation of a waste declaration card

Characterization of the waste:

Composition, physical and chemical properties of the waste Definition of HW code Definition of storage conditions Definition of protection requirements for employees

Acceptance of Chemical Waste

Technical evaluation by Valorec’s chemist:

Decision about acceptability of waste Definition of the packaging to the delivery Definition of internal instructions for the disposal

• f waste

Check of waste compliance after delivery:

Conditioning of waste Random sampling and analysis

Conditioning of Chemical Waste

Safe transportation Safe handling Reduced emissions

SOLIDS

• UN approved drums

Metal, plastic, fiber Size up to 200 L

• Cardboard boxes

LIQUID

• 200 L drums, IBC 1m3
• Isotank 20 m3

Technology for HW disposal

High Temperature Incineration

State of the art technology applied widely Large capacity of treatment (3.5 tons/h) Not sensitive to composition of HW Recovery of the heat value of HW Reduction of the amount of HW to less than 15%

• f weight

Effluents are monitored and environmentally friendly

High Temperature Incineration

Requirements for efficient combustion

Residence Time High Temperature Excess Oxygen Hazardous Waste

Technology for HW disposal

Combined Heat Recovery Boiler – Steam Turbine

High waste-to-energy yield (> 85%) Distribution of steam as utility to the chemical production units

Wet flue gas treatment

High removal efficiency for all pollutants due to multi-stage technology (> 99.9%) Buffer capacity to absorb peaks of pollutants

Small Scale Model of RSMVA Plant

Flow sheet RSMVA

Stack Catalyst NOX ca.1200°C 4.0 s Post- combustion Heat Recovery Boiler Waste water Treatment Acidic

• ca. 12 m3/h

Waste water Treatment Alkaline

• ca. 8m3/h

Aerosol SO2 SO2 Halogen Dust Quench ID Fan

• ca. 40’000

m3/h 250°C Ash Waste (Oil) Air (Oil) Air Slag Rotary Kiln 1150°C 2.5 s Length : 10 m Diameter : 4 m Weight : ca. 180 t Turbine Steam 10 bar 220°C Steam 45 bar 350°C Feed water Solvent Rhine/ARA Rhine/ARA Sludge

Annual Capacity of the plant RSMVA

25’000 tons of HW treated (s, l ,p, g) Valuable Products

5’500 MWh of energy produced 140’000 t of steam

Residues Streams

1’800 t of slag 1’000 t of metal hydroxide sludge 140’000 m3 of treated waste water 250 Million Nm3 of clean flue gas

Monitoring of Residues Streams

Clean flue gas:

Online in stack for:

Dust, HCl, VOC, SO2, NOx, NH3, CO

Discontinuous every 3 years for:

Dioxin, Heavy Metals, HF

Emissions RSMVA 2004

0% 20% 40% 60% 80% 100% CO NOX VOC NH3 HCL DUST SO2 Pollutant C o n cen tratio n in % o f th e lim it (acco rd in g to leg islatio n ) 50 80 20 5 20 10 50 0.02 t/a 1.77 t/a 9.0 t/a 0.02 t/a 0.47 t/a 0.14 t/a 0.42 t/a

Monitoring of Residues Streams

Treated Waste Water:

Online for:

Temperature, pH, TOC, Turbidity

Discontinuous:

automatic sampling device for storage of daily and monthly samples

Analysis of salts once a month Analysis of mercury every month Analysis of other heavy metals every 3 months

Monitoring of Residues Streams

Slag:

Landfill disposal in Switzerland Assessment of slag quality through leaching test every 3 months

Metal Hydroxide Sludge

Disposal in BigBags in old salt mines (Germany)

Conclusions

The operation of a Chemical Waste Incineration plant in urban area is possible. The commitment of producer and disposer is essential for an efficient waste disposal. Safe handling is possible with appropriate conditioning and declaration of the waste. High temperature incineration is the technology

• f choice for chemical waste disposal.