CCSR has initiated a project to use dredged material as an alternative
feedstock: eliminating the need for cement plants to purchase bauxite
and iron on the commodities market.
Slurry reactor where sediments will be
combined with other raw materials. This wet process means
that no sediment dewatering is required.
Cost savings for cement plant - cost savings for dredging operation.
For a plant with overall capacity of 3.2 million tons per year,
650,000 tons of sediment can be used. Cost savings: $1.6 million
for the cement plant, and $26 million for dredging (with no charge
for taking cement).
Rotary kilns where mineral feedstocks
are melted to form cement clinker. Temperatures of 1,450 C
ensure complete destruction of organic contaminants.
Ball mill to pulverize clinker into fine
powder. Heavy metals remaining in cement are expected to be
incorporated into mineral matrix and unavailable for leaching
CCSR has begun collaborating with Lafarge Cement, U.S. EPA, U.S.
Army Corps of Engineers, and New York State Department of Environmental
Conservation to conduct a full-scale demonstration of this technology.
Issues to resolve include public acceptance, worker health and safety,
materials handling, and verification of organic contaminant destruction.
Dr. Kevin Gardner
Center for Contaminated Sediments Research
336 Environmental Technology Building
University of New Hampshire
Durham, NH 03824
(603) 862-4334 [phone]
(603) 862-3957 [fax]