Kopeopeo Canal Remediation Project Community Liaison Group Meeting - - PowerPoint PPT Presentation
Kopeopeo Canal Remediation Project Community Liaison Group Meeting 21 August 2018 1 Meeting agenda topics Welcome & introduction John Pullar Approval of minutes from previous meeting Communications update Abby Tozer
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21 August 2018
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Dredging trial, 2015 Open day, 2013
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(Find the link from our webpage)
are published
21 August 2018
Canal sediment
Definition: Use of microorganisms (bacteria and fungi) and plants to break down or degrade contaminants. Bioremediation goal: Detoxification of compound(s) and conversion to products that are no longer hazardous to human health and the environment.
Environmental conditions
Microorganisms and Plants
and soil fungi
soil bacteria)
Contaminant
Scientists Regional Council Engineers Ngati Awa
Gathering Information Communication 8 Years of Research and Development Development of protocol to monitor healing Developing relationships with each other and the land Implementation of bioremediation (2018-2019)
Use of White rot fungi (Basidomycetes) and a soil fungus (Zygomycetes) to degrade contaminants These fungi are saprophytes (live on dead matter) and form complex mycelial networks in soil and wood The Lignin-degrading system is responsible for degradation of dioxin to CO2 Degradation is fortuitous – no energy gain
Bacteria
Fungal mat
Geobag
during filling)
sediment
al mat
The use of plants to improve the environment Happens by way of extraction, degradation or management of soil contaminants For dioxin we are looking at degradation. The chemicals are broken down in the soil by microorganisms associated with plant roots
Water and contaminants out
Sugars and organic material into the soil
Plant-remediation is driven by transpiration Remediation is linked to soil biological health
Bacteria Bacteria Enzymes
the sediment
bacteria to grow (THE BACTERIAL WARS)
enzymes that break down the contaminant (dioxin)
Preparation for bioremediation
Addition of lime Addition of wood pellets Addition of monitoring probe (One GEOBAG at CS1 will have set of monitoring Probes Sept 2018) Dewatering and equilibrium period Baseline testing (September 2018)
Preparation of bioremediation agents
The white rot will be prepared as pre-packaged fungal inocula (PRODUCTION STARTING August 2018) Soil fungus will be grown as a
trees will be sourced (PRODUCTION STARTING MAY 2019)
Implementation
bioremediation
Solid fungal inocula will be placed onto wood pellet layer on the surface of sediment through port-holes (8 bags of inocula per port-hole) (STARTING September 2018) Soil fungus, bacteria and enzymes will be injected into sediment when trees planted (STARTING JULY 2019) Poles of either willow or poplar species will be inserted into sediment. (STARTING JULY 2019)
Long term monitoring and evaluation
On going analyses of probe information PDCD and PCDF testing DNA testing
2 weeks required for growth 2 weeks required for growth 3-4 weeks required for growth
Addition of wood, lime to sediment as it is pumped into Geobags Addition of Solid fungal product Top soil layer added over Geobags Addition of Liquid fungal product, bacteria, enzymes and trees
Bacteria Fungal mat Geobag
during filling)
sediment
al mat
Will dioxin be uptaken by the trees, and be in the leaves? What will happen to the tree roots? How long will bioremediation take? What is dioxin broken down to?
Anaerobic Bacteria: Dechlorination OCDD→1,2,3,4,6,7,8-HpCDD→1,2,3,6,7,8- HxCDD→1,2,3,7,8-PeCDD→2,3,7,8-TCDD→2,3,7- TrCDD→2,7-DCDD→2MCDD→DD Basidiomycete Fungi Metabolise 2,3,7,8 TCDD and OCDD to 4,5-dichlorocatechol and tetrachlorocatechol, respectively
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FCS West Dredged to date 20-08-2018 Validated to 1850m Lift over bridge 1 Lift over bridge 2 Lift over Paroa Rd Bridge 3 Lift over SH30 Bridge 4 S1 to S4 1850m 2000m
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See the Reports and Key documents page
July 2018 June 2018 May 2018
To be posted soon
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location and levels
methodology for EMVP
and observations systematically documented
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located at CS1. Total PCDD/F I-TEQ Upperbound results between 5.68 and 8.61 pg/L were recorded in these water samples.
located at CS3. Total PCDD/F I-TEQ Upperbound results between 4.28 and 10.6 pg/L were recorded in these water samples.
the consented limit of 30 pg/g.
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Before / After Redgredging & revalidation Before / After Redgredging & revalidation
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Before / After Redgredging & revalidation
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Canal Section Statistic Sediment Dioxin Concentrations pg/g I-TEQ Section 1 count 7 min 20 max 51 mean 33.9 Section 2 count 12 min 20 max 64 mean 35.6 Section 3 count 16 min 21 max 61 mean 31.5 Section 4 count 21 min 21 max 57 mean 34.0
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In section 4, the canal sediment Total PCDD/F WHO-TEQ Upperbound results ranged between 21 and 57 pg/g which is below the remedial target of 60 pg/g. “The technical definition of a 95% UCL is “a number that one can be 95% confident that the true mean (average) concentration of the population is below that value” . The 95% UCL for Total PCDD/F I-TEQ Upperbound results from the first 2400 m validated section of the Kopeopeo Canal was 36 pg/g, which is below the remedial target of 60 pg/g.
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Canal Turbidity
Turbidity vs Dioxin FCS-E Turbidity Date Total PCDD/F I-TEQ - Upperbound (pg/L) Turbidity at MP8 (NTU) Turbidity at MP10 (NTU) 14-Jul 5.07 16.4 19.2 17-Jul 5.42 42.9 29.4 19-Jul 7.00 43.8 29.5
Canal turbidity (NTU, 5 minute average). from Ricado 25-Jul-2018 same day as following photographs were taken Canal turbidity vs dioxin levels. Samples collected by
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MP3, Paroa Road bridge (102 NTU) MP2, Kope Drain Road (47 NTU) MP10, FCS-East (13.9 NTU) Te Rahu Drain (8km east along Paroa Road) Whakatane River, ~180m East and 180m upstream of MP8 Drain along Patuwai Road (~1km from Kopeopeo Drain)
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Remedial works associated with the stopbank disturbance. Bailage was laid
risks. CS1, hose ruptured but sediments contained in cell Sand bug dredge pumping black sediment into the main canal as part of the dredging of the Kope pump station canal dredging works. These sediments will be dredged and delivered to the geobags at CS3 cell by the main dredge.
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prevent liner lifting
6day working week
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