API Publ 4671:1998 pdf download

API Publ 4671:1998 pdf download.TECHNICAL BULLETIN ON OXYGEN RELEASING MATERIALS FOR IN SIitu GROUNDWATER REMEDIATION.
Step 1
The first step is to estimate the 02 demand that will be exerted by contaminated groundwater entering the treatment zone. As discussed in Section 2, this calculation should be performed using integrated concentration measures (TPH, BOD, etc.). Note that contaminants sorbed to sediments are not included in this calculation because only contaminants in groundwater flowing through the treatment zone will contact the 02 generated by the ORM. However, oxygen consumpion by sorbed sediments, residual NAPL and free product, and reduced species in groundwater or sediment will have to be considered if it is likely that dissolved 02 released by the OR.M will contact these materials.
Step 2
The second step is to estimate the rate of 02 release required (1) to degrade petroleum hydrocarbons (and perhaps naturally occurring dissolved organic carbon) in the contaminant plume via aerobic respiration pathways, and (2) to oxidize reduced inorganic species in solution (e.g., Fe2’). The rate of 02 required to meet the microbiological demand is obtained by multiplying the contaminant concentrations by an appropriate stoichiometric coefficient (e.g., equation 1) and then multiplying by the pore water velocity and cross-sectional area of the plume. Similar calculations can be performed to determine the rate of 02 required to oxidize reduced inorganic species (e.g.. equation 2).
Step 3
The next step is to estimate the 02 release rate of the proposed ORM installation. This is done by multiplying the 02 release rate of the particular ORM formulation to be used by the total volume of ORM in the interceptor trench, boreholes, etc. The 02 release rate will be a function of the ultimate 02 yield of the ORM, the 02 demand exerted by the groundwater. and the method of application.
COST ESTIMATES FOR ORM INSTALLATIONS
Cost estimates are determined by combining cost for the ORM (calculated using the steps above) with the usual mobilization/demobilization, personnel, equipment use, material, and decontamination costs. Current cost data are best obtained from ORM manufacturers, drilling contractors, etc.