The Mapua Clean-up Presented by: Juhel Jeremy & Waleed Al Harmali.

TheThe Mapua Clean- Mapua Clean-upup

Presented by:Presented by:

Juhel JeremyJuhel Jeremy &&

Waleed Al Waleed Al HarmaliHarmali

Brief BackgroundBrief Background

Location: in New Zealand near Nelson Former Owner: Fruitgrowers Chemical Co. (FCC) Funding: Ministry of Environment & (TDC)

QuickQuick HistoryHistory 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 ProblemThe Problem

nature of the soil is a mix of clay, silt and gravel4 hectares & 50,000 m3 contaminated soilspills & some waste being buried on site: 1930-1988 50% of soil is 10 times & other 50% 1,000 times800m3 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 & BenefitsAim & Benefits

prototype clean-up for New Zealand restore a clean landscape, 40% public spaceCommercial and groundwater protection

= 200ppm DDX; 60ppm dieldrin + aldrin Residential and surface water protection

= 5 ppm DDX ;3 ppm dieldrin + aldrin

Short BreakShort Break

The Concerned SolutionsThe 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 SolutionsAlternative Solutions2. 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 ppm3. 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

ComparisonComparison

The Final SolutionThe Final Solution

MCD , or ballmillling process by EDL• Focused on the destruction of DDT and dieldrin

The plant was built during 2004Proof 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 ProcessThe Process

Unique ball mill technology

3 main components : soil drier, air quality control equipment and a MCD reactor

ScienceScienceThe 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 ProgressSite Progress

Site ProgressSite 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 PicturesSome Pictures

ResultsResults

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?Any Questions?

It’s over