Invitation To Tender For design and construction of health care waste incinerator at Mbuma Mission Hospital in Nkayi.
Tenders
- World Vision
- Expires 18 Mar 2025
- Nkayi
- Full Time
Job Description
INVITATION TO TENDER
TENDER NUMBER: NKAYI001/FY25
World Vision Zimbabwe is seeking bids from reputable construction and engineering organisations to design and construct health care waste incinerator at Mbuma Mission Hospital in Nkayi. The size of the incinerator is a 20kg per hour capacity for combined coal and diesel fuels.
The purpose of the incinerator is to burn healthcare waste, comprising hazardous and nonhazardous materials (apart from radioactive waste), should be disposed of in an incinerator. With the proper operational, safety, and environmental controls, the incinerator system must be able to run continuously. All applicable local, regional, and federal environmental and health regulations for emissions, such as those about particulate matter (PM), carbon monoxide (CO), nitrogen oxides (NOₓ), and sulfur oxides (SOₓ), must be met by the incineration unit. The incinerator offers low emissions, dependable, effective, and ecologically friendly trash disposal.
To guarantee full combustion and reduce hazardous emissions, the incinerator should use a two-stage (primary and secondary) incineration method. Installation services, such as site setup, testing, commissioning, and preparation, must be supplied by the potential providers or contractors. A technical and financial proposal that satisfies the technical requirements listed below must be submitted by interested bidders.
Duties and Responsibilities
N/A
Qualifications and Experience
GENERAL SPECIFICATIONS
1.1 The incinerator should be designed to dispose of healthcare waste, including nonhazardous and hazardous materials (excluding radioactive waste).
1.2 The system must be capable of continuous operation, with appropriate safety, environmental, and operational controls.
1.3 The unit must comply with all applicable local, regional, and national environmental and health standards for emissions, including limits on particulate matter (PM), carbon monoxide (CO), nitrogen oxides (NOx), and Sulphur oxides (SOx). The incinerator provides reliable, efficient, and environmentally responsible waste disposal with low emissions.
2. TECHNICAL SPECIFICATIONS:
2.1 INCINERATOR DESIGN:
2.2 Type: Coal or Diesel-fired batch incinerator designed for healthcare waste. The incinerator must have options to use either coal or diesel as a fuel.
2.3 INCINERATION CAPACITY
2.4 20 kg per hour (20 kg of healthcare waste per batch).
2.5 COMBUSTION PROCESS
2.6 Two-stage (primary and secondary) incineration process to ensure complete combustion and minimize harmful emissions.
2.7 WASTE INPUT
2.8 Processes various types of healthcare waste, including contaminated materials such as placentas, bandages, body tissues, gloves, sharp wastes and plastics. The system also handles infectious waste but exclude radioactive wastes and aerosols.
3.0 PRIMARY AND SECONDARY CHAMBERS
3.1 CHAMBER DIMENSIONS
3,2 Sufficient to handle 20 kg per hour of waste in each batch. Chamber sizes designed based on the waste type and volume.
3,3 MATERIAL OF CONSTRUCTION
3.4 6mm carbon steel for the incinerator lined with ceramic refractory lining to withstand high operating temperatures (850°C to 1200°C).
4.0 DESIGN
4.1 Rectangular combustion chamber (Primary & Secondary) with robust insulation for thermal efficiency.
4.2 OPERATING TEMPERATURE
4.3 Primary combustion chamber temperature of 850°C - 1000°C; secondary chamber temperature of 1050°C - 1100°C for post-combustion.
4.4 AIR SUPPLY
4.5 Forced draft fan (FD fan) and secondary air injection for optimized combustion and temperature maintenance.
5.0 FUEL SYSTEM:
5.1 FUEL TYPE
5.2 Coal or Diesel (liquid fuel) for efficient and consistent combustion.
5,3 DIESEL BURNER
5,4 The incinerator is fitted with an atomizing diesel burner to ensure uniform heating and minimal fuel wastage when diesel is used as a fuel.
5.5 FUEL CONSUMPTION
5.6 The system must consume approximately 0.8 - 1.0 litres of diesel per kilogram of waste (variable depending on waste type).
5.7FUEL TANK
5.8 The system must have an integrated diesel storage tank with a capacity of 100 litres, sufficient for at least 24 hours of continuous operation. The fuel tank must be equipped with level sensors, shut-off valve, and spill containment features.
6.0 AIR POLLUTION CONTROL:
6.1 EMISSIONS CONTROL
6,2 The incinerator must meet local air quality standards (Environmental Management Act, EMA ACT, CHAPTER 20: 27.
6,3 The system must include an exhaust stack with a minimum height of 12 meters to ensure proper dispersion of emissions.
6,4 The unit can be incorporated with a particulate matter (PM) filter or a venturi wet scrubber for removing pollutants such as particulate matter, SOx, NOx, and CO.
7.0 CONTINUOUS EMISSIONS MONITORING
7.1 The system must have Provisions for continuous monitoring of key emissions (CO, CO₂, NOx, SOx, and particulates).
7,2 The system should allow fitting can be fitting of alarms which monitors for exceeding emission thresholds.
8.0 STACK GAS TEMPERATURE
8.1 150°C - 250°C at the exhaust stack (post-combustion).
9.0 SAFETY FEATURES:
9.1 OVER-TEMPERATURE PROTECTION
9.2 The incinerator must have an Automatic temperature regulation and shutdown in the event of overheating.
9.3 FUEL SAFETY
9.4 The incinerator must have an Emergency shut-off valve, flame arrestor, and fireproofing in the diesel fuel system.
10.0 DOOR SAFETY
10.1 The incinerator must have Insulated waste loading and ash doors with a safety lock mechanism to prevent accidental opening during operation.
11.0 CONTROL SYSTEM:
11.1 TEMPERATURE CONTROL
The incinerator must have a precise temperature control within the combustion chambers, monitored via thermocouples and temperature controller.
12.0 WASTE HANDLING AND UNLOADING:
12.1 BATCH LOADING
12.2 Manual loading of healthcare waste.
12,3 ASH HANDLING
12,4 Manual rake mechanism for efficient ash disposal.
13.0 ACCESS DOOR
13.1 Lockable, insulated door for waste loading/unloading, ensuring minimal heat loss and providing safe access.
13.2 WASTE SIZE
13.3 The system must accommodate various waste sizes, with a maximum waste particle size of 50 mm.
14.0 PERFORMANCE REQUIREMENTS:
14.1 THERMAL EFFICIENCY:
14.2 OVERALL EFFICIENCY
14.3 The incinerator must have a minimum thermal efficiency of 70%, optimized to reduce fuel consumption and minimize environmental impact.
15.0 EMISSIONS
15.1 The incinerator must comply with national and international standards for healthcare waste incineration, including limits on particulate emissions, CO, CO₂, NOx, and SOx.
15.2 OPERATION
15.3 The unit should be able to operate continuously for at least 8 hours per day with ease of operation, minimal downtime, and low operational costs.
15.4 START-UP TIME
15.5 The incinerator should be able to reach operating temperatures within 30 minutes of starting.
16. MAINTENANCE
16.1 The system should be Low-maintenance system with easily accessible parts for routine checks, including burner, temperature controls, and emission control systems.
17. ENVIRONMENTAL COMPLIANCE:
17.1 REGULATORY COMPLIANCE:
17.2 The incinerator must meet all local and international environmental standards for healthcare waste incineration, including:
17.2.1 Limits on CO, NOx, particulate matter (PM), SOx, dioxins, and furans.
17.2.2 Health and safety regulations for operation, emissions, and worker safety.
18 WARRANTY AND SUPPORT
18.1 WARRANTY
18.2 Minimum 24-months warranty covering all parts and labour for defects in materials and workmanship.
19.0 SERVICE AGREEMENT
19. Optionalannualmaintenanceservicecontractforongoingsupport, calibration, and parts replacement.
20. TRAINING
20.1 Full training for operators on safe operation, emergency procedures, and basic maintenance of the incinerator.
21 DELIVERY AND INSTALLATION:
21.1 DELIVERY TIME
21,2 Maximum of 5 weeks from order date.
22. INSTALLATION
22.1 The supplier or contractor must provide installation services, including site preparation, setup, testing, and commissioning.
23.COMMISSIONING
23.1 Testing of the system to ensure compliance with operational specifications and emissions standards.
24.ADDITIONAL REQUIREMENTS:
24.1 DOCUMENTATION
24.2 Detailed user manual, maintenance guidelines, and compliance certification must be provided by the supplier or contractor upon delivery.
25. ADMINISTRATIVE CONDITIONS
25.1 At the time of submitting bids, the bidder, company or organization will be required to submit an undertaking on their company letterhead, duly signed and stamped, making a declaration that the bidder/company has:
2 25.2 Never been convicted of an offence concerning their professional conduct
25.3 Never been subject to fraud, corruption, involved in a criminal activity or any other illegal activity
25.4 Fulfilled obligations relating to the payment of social security contribution or taxes
25,5 Never been involved in any form of child abuse
26. Documents to be submitted
26,1 A copy of ‘Certificate of Incorporation
26.2 A Valid Tax Clearance for Tenders (ITF 263 Form)
How to Apply
Completed bids should be sent to the World Vision Southern Region Office at 32 Park Road Suburbs, sealed in an envelope addressed to the Procurement Committee, and marked with the tender reference "INCINERATOR DESIGN & CONSTRUCTION."
Closing date for submission of bids is 12pm, Tuesday 18 March 2025.
Faxed, e-mailed or late tenders will NOT be considered.
TECHNICAL SPECIFICATIONS FOR A 20 KG PER HOUR COMBINED COAL OR DIESEL FIRED HEALTHCARE WASTE INCINERATOR
