The Mapua Clean-up Presented by: Juhel Jeremy & Waleed Al Harmali
Brief Background Location : in New Zealand near Nelson Former Owner : Fruitgrowers Chemical Co. (FCC) Funding: Ministry of Environment & (TDC)
Quick History 1930 : FCC founded 1940s: producing organochlorine pesticides: DDT, DDD and dieldrin 1970: making 84 different types of pesticides and fungicides, using 124 chemicals 1988: FCC closed => site “ orphaned” 1996 : TDC acquired the land from the former owners 2001: working EDL & its MCD technology
The Problem nature of the soil is a mix of clay, silt and gravel 4 hectares & 50,000 m 3 contaminated soil spills & some waste being buried on site: 50% of soil is 10 times & other 50% 1,000 times 800m 3 of marine sediments exceed up to 50 times 5 parts per million of DDT and 3 parts per million of dieldrin up to 5,000 ppm DDX and 200 ppm dieldrin hotspot
Aim & Benefits prototype clean-up for New Zealand restore a clean landscape, 40% public space Commercial and groundwater protection = 200ppm DDX; 60ppm dieldrin + aldrin Residential and surface water protection = 5 ppm DDX ;3 ppm dieldrin + aldrin
Short Break
The Concerned Solutions 3 companies out of 26 with different technologies: 1.MCD, or ballmillling process by EDL 2.Xenorem bioremediation composting by Environmental Remediation 3.Daramend bioremediation composting by Waste Management
Alternative Solutions 2.Best result: using NZ poultry manure and woodchips (12 weeks) DDX was reduced from 682 ppm to 54 ppm dieldrin from 122 ppm to 12 ppm 3.Best result: (147 days) DDX: from 1060 ppm to 34.6 Dieldrin & Aldrin: from 59 ppm to 11.5 ppm “Commercial” slandered achieved BUT “residential” land use standard NOT
Comparison
The Final Solution MCD, or ballmillling process by EDL Focused on the destruction of DDT and dieldrin The plant was built during 2004 Proof of performance trial in August 2004 Amount of contaminant destruction Environmental emissions (air discharges, noise, vibrations) Full scale remedial works began in November 2004
The Process Unique ball mill technology 3 main components : soil drier, air quality control equipment and a MCD reactor
Science The MCD reactor is the key feature of the plant designed to optimize the destruction of organic contaminants using mechanochemistry What is the mechanochemistry? Chemical and physico chemical changes of solids due to the influence of mechanical energy
Site Progress
Excavation of the soil Ground water has been pumped Different piles of soil Tested and validated against the soil acceptance criteria Reinstated back into the clean holes Soil treatment Soil estimated to require treatement Contaminants destroyed to a certain level
Some Pictures
Results Better than expected Residential level is achieved (5 ppm DDX ;3 ppm dieldrin + aldrin) Clean landscape Final solution « Environmentally friendly » Ball milling is a highly interesting technology Successful project
Any Questions? It’s over