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Stabilization/Solidification - 6.0 Treatment Costs

 

6.0 Treatment Costs

6.1 Costs for Different Construction Methods

A summary of cost comparisons for four different S/S construction methods is given in Table 6.1 The actual costs may be different today because of changes in reagent costs and labor costs, but the relative costs should be the same. 

  • In-drum mixing is the most expensive and time-consuming, while the costs and treatment time of the other four are more consistent;
  • Costs can be cut down by changing the reagents used, but this is not effective for in-drum mixing because costs of reagents occupy a small proportion of total costs. 

 

 Table 6.1: Summary comparison of relative costs for different S/S construction methods

 

Parameter

In Drum

In Situ

Plant Mixing

Area Mixing

Pumpable

Unpumpable

Metering and mixing efficiency

Good

Fair

Excellent

Excellent

Good

Processing days required

374

4

10

14

10

Cost/ton

 

 

 

 

 

 Reagent ($)

20.50

(9%)

20.50

(63%)

20.50

(53%)

20.50

(42%)

20.50

(49%)

    Labor and per diem ($)

51.07

(23%)

1.36

(4%)

3.83

(10%)

6.93

(14%)

6.35

(15%)

   Equipment rental ($)

37.14

(17%)

1.38

(4%)

3.93

(10%)

7.54

(16%)

4.07

(10%)

Used drums

     at $11/drum ($)

48.18

(21%)

-

-

-

-

  Mobilization-demobilization

15.68

(7%)

1.58

(5%)

1.43

(4%)

2.26

(5%)

1.20

(3%)

Cost of treatment process

172.57

24.83

29.69

37.23

32.11

Profit and overhead (30%)

51.72

(23%)

7.45

(23%)

8.91

(23%)

11.17

(23%)

9.63

(23%)

Total cost/ton ($)

224.29

32.28

38.60

48.40

41.75

Reproduced from: USEPA, 1986

6.2 Costs for Different S/S Processes

USEPA (1996) summarized the costs for different S/S processes from information provided by the companies owning the processes. According to the results, the relative costs for different methods are:

  • Lime/ash method < Portland cement method < polymer encapsulation

6.3 Factors Affecting Treatment Costs

  • Type of waste

Moisture content in waste increases costs compared to solid waste;

Contaminant concentration and type, which determines the amount of reagents used.

  • Size of S/S site

The larger the site, the easier the scenario and the lower the cost.

See table 6.2 below for a comparison of various site/treatment difficulty scenarios.

 

Table 6.2: Costs for different site size/treatment level scenarios.

 

Racer parameters

Small site

Large site

Easy

Difficult

Easy

Difficult

Cost per ft3

$6

$7

$4

$5

Cost per m3

$216

$248

$124

$190

Cost per yd3

$165

$189

$94

$144

Reproduced from: www.frtr.gov

 

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