Beneficiation of Builders Rubble City of Cape Town PAST TO PRESENT - - PowerPoint PPT Presentation

Beneficiation of Builders Rubble – City of Cape Town PAST TO PRESENT

INFORMAL SETTLEMENTS,WATER AND WASTE SERVICES DIRECTORATE 9th May 2018

BROAD OVERVIEW

• Past tenders & challenges
• Rubble trends over the years and present status

(2003-2018)

• Present tender and structure – 98S/16/17
• Vision and challenges going forward

Past tenders and challenges faced

2008 - Tender 1

• Contract conditions
• Crush builders rubble
• Contractor paid CoCT monthly fee to use the site
• Contractor had access to all material coming to Disposal site
• Bellville Landfill was the test site - contract only ran at BLFS
• Contractor was to find own market and could set own prices etc
• Challenges
• Operating costs > income achieved from sales
• Catch 22 – costs to produce saleable stocks vs sales income from stocks (lag

period)

• Market demand fluctuations made it difficult to anticipate demand
• Outputs were low to keep overheads down – negatively impacted on sales
• Contractor folded up before tender term leaving stockpile of crushed

material on site at a loss

2011 – tender 2

• Contract conditions
• Crush builders rubble
• No rental/occupation costs to contractor
• Contractor had access to all materials coming to sites
• Flexibility to roam to other sites on adhoc basis
• No restrictions on market/prices to clients
• Challenges
• Contractor had inserted a qualification clause into the tender submission
• (would only begin crushing/operations if the market was

conducive/receptive)

• Eventually after 6 months of the appointment the tender was cancelled

Insights and inputs into new tender specifications

• Engagement with CoCT Infrastructure Management and Development
• GreenCape - construction industry engagement & feedback
• CoCT waste minimisation strategy
• Lessons from past tenders

2018 – tender 3

• Contract conditions
• Beneficiate construction and demolition waste/material by:
• Separation (Sort new material entering site)
• Crushing

(coarse material)

• Processing of existing stockpile (screen, pick, recover, crush, etc)
• Targets set but can be reviewed/ certain flexibility
• Zero rate or rate per ton of processed material “taken off site”
• No Coct charges to contractor
• Challenges
• Building up stockpile whilst incurring operating costs
• Heterogenous materials in stockpile
• Marketing/networking
• Grading processed material – G4-G7

Rubble trends over the years and present status

Builders rubble to landfill – trends 2003 thru 2018

100000 200000 300000 400000 500000 600000 700000 800000 900000 3/4 4/5 5/6 6/7 7/8 8/9 9/10 10/11 11/12 12/13 13/14 14/15 15/16 16/17 17/18 Coastal Park Bellville Vissershok

Builders rubble to landfill – trends 2003 thru 2018

100000 200000 300000 400000 500000 600000 700000 800000 900000 3/4 4/5 5/6 6/7 7/8 8/9 9/10 10/11 11/12 12/13 13/14 14/15 15/16 16/17 17/18 Coastal Park Bellville Vissershok

Coastal Park Landfill present stockpile

Bellville Landfill present stockpile

Present tender 2018 – Aggre8 (tender 98S/16/17)

2018 Tender specifications – price schedule

PRICE SCHEDULE 1 – COASTAL PARK LANDFILL SITE Assume 1 m3 = 1 ton ITEM / DESCRIPTION UNIT QUANTITY UNIT RATE (EXCL. VAT) ITEM 1 : SEPERATION / SCREENING Description : new material coming in

• ver the weighbridge. Keep like

materials in separate piles for further processing or sale eg. Asphalt, sand, clay, stone, concrete, pavers, bricks etc. FEE / MONTH (R) 12 ITEM 2 : CRUSHING Description : crushing coarse material (rubble, concrete, bricks, boulders etc) into crushed stone. The crushed material should be properly graded into G4/5 and/or G7/8, for

• nward sale.

RATE / TON (R) ITEM 3 : PROCESSING EXISTING STOCKPILE Description : approximately 120 000 m3 in stockpile RATE / TON (R)

2018 tender specifications - descriptors

Item / activity Coastal Park Landfill Bellville South Landfill Vissershok Landfill Incoming mixed material Approximately 30 000 – 40 000 t / mth Approximately 18 000 t /mth Approximately 20 000 t /mth Separation/Screening The breakdown of above incoming material is approximately – 50%, Sand/fines, 30% Mixed (brick, mortar, paving), 20% Concrete slabs/ lintels/ boulders Crushing Incoming mixed material consists of approximately 50% crushable material, consisting of 20% G4/5 suitable feed and 30% G7/8 suitable feed This approximates 15 000-20 000t / mth This approximates 9 000t /mth This approximates 10 000t/mth Stockpile processing Approximately 120 000 m3(tons) in rubble stockpile Approximately 36 000 m3(tons) in rubble stockpile Approximately 12 000 m3(tons) in rubble stockpile

2018 tender specifications – anticipated incoming

Disposal site Average tonnage received monthly (2015/16 year) Average tonnage received daily (2015/16 year) Coastal Park landfill 39 000 t 1 700 t BellvilleSouth landfill 18 000 t 780 t Vissershok landfill 21 000 t 900 t New Not verified Not verified Average Incoming tonnage of C&D material/waste (month/day) feb 2016

Coastal Park landfill – commencement of tender

Coastal Park landfill – processed material piles

Vision and challenges going forward

Vision Challenges

• Expertise, skills and experience
• Understand C&D industry
• Well established in Gauteng
• Create market need
• Already graded product G5/G6
• Commitment to make it work
• Target everything in C&D material

for re-use

• Large resource base
• Flexibility and co-operation
• Create future potential
• Getting to know local conditions
• Establishing networks/contacts
• Acclimatisation
• Market conditions
• Sustainable quantities of material
• ver term of tender
• Test conditions and allocate

resources accordingly

• Meeting break even point asap
• Buy in of Coct/Province for graded

product use in infrastructure projects

Thank You