Biosolids Management

Dredging & Dewatering

Flexible Fluid Transport Solutions

Industrial Effluents Treatment

Lead Free Solutions

PFAS Removal Solutions

Water Main Renewal

Construction & Demolition Fines Recycling

Environmental Site Remediation

Industrial Degraded Sites Management

Regulated Materials Management

Risk Assessment

Soil and Material Management

PROJECT

Dredging, Dewatering and Transportation of Pulp Mill ASB Wastewater Sludge

SERVICE
INDUSTRY

Pulp & Paper

PROJECT LOCATION

Alberta

PROJECT DATE

2015-2023

QUANTITY
10,000 dry tonnes of wastewater solids removed
CHALLENGES
Dredging, dewatering and transporting up to 10,000 dry tonnes of pulp mill Aerated Stabilization Basin (ASB) wastewater sludge from the mill’s lagoon system, with direct loading into transport trucks, at the break-up time of year when road restrictions/bans can affect transportation to the landfill. In 2021 (and also for future years), an additional challenge was the identification of other landfills/disposal sites that can accept the material and the volume to be disposed of, as both the mill landfill and the local privately-operated landfill previously closed.
BACKGROUND
The client has two plants in southern California. Plant 1 treats up to 200 million gallons of wastewater each day and has 12 large digesters. Plant 2 treats up to 150 million gallons of wastewater each day with several, smaller digesters located right at the Pacific Ocean shore. More than 2.5 million people are serviced in the southern California area.
SOLUTION
APG approached the project with 4 and 5 centrifuge dewatering configurations to maximize the production of the dewatering operation and work 24 hours per day to reduce the total project completion time. APG’s hauler provided enough trucks each day and night to allow for continuous operations without having to temporarily stockpile the dewatered sludge on the ground. In 2021, APG assisted in identifying a new disposal site, as the landfill used previously had closed.

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