Comentarios INTERBUS Club.

The Holland Landing WPCP is a facultative seasonal discharge lagoon system. It is located on the Holland River, and services the Town of East Gwillimbury. The facility is owned and operated by the Regional Municipality of York. The Holland Landing WPCP has a CofA rated ADF capacity of 1,346 m3/d. It discharges seasonally to the Holland River via a 600 mm diameter outfall sewer.

The plant consists of four wastewater stabilization lagoons; Cell #1 and Cell #2 with an approximate volume capacity of 40,900 m³ each, and Cell #3 and Cell #4, each with an approximate volume capacity of 85,000 m³. An influent distribution chamber controls influent flow to Cell #1 and Cell #2, or diverts to Cell #3 and Cell #4. Two influent chambers control flow between Cell #1 and Cell #2, and between Cell #3 and Cell #4.

Figure 3.13 presents a process flow diagram of the treatment process at the Holland Landing WPCP.

Raw Wastewater

Manual Alum Dosing

Holland Landing WPCP Process Flow Diagram

Effluent To Holland River Influent Distribution Chamber Lagoon Cell #1 Influent Chamber Influent Chamber

Manual Alum Dosing

Lagoon Cell #2

Manual Alum Dosing

Lagoon Cell #3

Manual Alum Dosing

Lagoon Cell #4

Figure 3.13 Holland Landing WPCP Process Flow Diagram

3.7.1 Performance Requirements

The Holland Landing WPCP operates under CofA Number 9156-7R5LKN and has a rated ADF capacity 1,364 m3/d. The effluent TP objectives and limits for the Holland Landing WPCP are presented in Table 3.25. Included in the table is the interim annual phosphorus loading limit as outlined in O. Reg. 60/08 and amended in O. Reg. 130/09.

Table 3.25 Certificate of Approval and Interim Effluent Phosphorus

Objectives and Limits for the Holland Landing WPCP

Parameter Effluent Objective (1) Interim Annual Loading Limit (2)

Effluent TP Concentration 0.3 n/v

Effluent TP Loading n/v 149 kg/yr

Notes: n/v – no value

1. No effluent TP limit is identified in the CofA.

2. Based on O. Reg. 60/08 and later amended by O. Reg. 130/09.

3.7.2 Historical Performance

The historic operating performance of the Holland Landing WPCP with respect to phosphorus removal is presented in Table 3.26.

Table 3.26 Historic Phosphorus Removal at the Holland Landing WPCP

Parameter 2006 2007 2008 Overall

ADF (m3/d) 1,474 1,015 1,119 1,203

Raw Sewage TP Concentration (mg/L) 4.5 6.2 5.8 5.5

Raw Sewage TP Loading (kg/d) 6.6 6.3 6.5 6.6

Effluent TP Concentration (mg/L) 0.14 0.14 0.19 0.16

Effluent TP Loading (kg/d) 0.21 0.14 0.21 0.19

Annual Effluent TP Loading (kg/yr) 75.3 51.9 77.8 68.3

Phosphorus Removal (kg/d) 6.4 6.1 6.3 6.4

Total Phosphorus Removed (kg) 2,346 2,245 2,298 4,644 (1)

Operating Costs (CAD) $25,183 $42,544 $22,689 $47,872 (1)

Cost/kg TP Removed (CAD/kg TP) $10.73 $19.00 $9.87 $10.31 (2)

Notes:

1. Two year total based on 2006 and 2008 data.

2. Based on two year total Operating Costs divided by two year Total Phosphorus Removed.

The Holland Landing WPCP has historically operated at approximately 88 percent of the CofA rated ADF capacity of 1,364 m3/d. The three year average effluent TP concentration from the plant is 0.16 mg/L, which meets the effluent objective of 0.3 mg/L. Currently there is no effluent TP limit identified in the CofA. Over the period from 2006 to 2008, the monthly average effluent TP exceeded the effluent TP objective in May and June of 2008. Over the same period, the annual effluent TP loadings were below the interim limit of 149 kg/yr.

The three year average effluent TP concentration from the Holland Landing WPCP is 0.09 mg/L. From 2006 to 2008, approximately 6,889 kg of phosphorus were removed. In 2007, chemical costs were nearly double the amount in each of the other two years. The cause of this increase is uncertain. As a result, data from 2007 will not be included in the overall historical unit removal costs. The effective unit removal cost for the Holland Landing WPCP for 2006 and 2008 was $10.31 CAD/kg TP removed.

3.7.3 Upgrades to the Existing Facility to Achieve Effluent TP Objective

Concentrations of 0.10 mg/L

Conceptual level upgrades to the Holland Landing WPCP were developed for the construction of a mechanical plant with tertiary filtration. Table 3.27 presents the incremental costs associated with upgrading the Holland Landing WPCP to secondary treatment with tertiary filtration. Included in the table are annual O&M costs and a 25-year life cycle cost.

Table 3.27 Incremental Costs to Upgrade to Secondary Treatment with Tertiary Filtration for the Holland Landing WPCP

Parameter Summary

Capital Cost (CAD) $8,580,000

Annual O&M Costs (CAD) $320,000/yr

25-Year Life Cycle Cost (1) (CAD) $13,150,000

Additional TP Removed Annually (2) 100 kg/yr

Total Additional TP Removed (25-yr Total) 2,489 kg

Cost/kg TP Removed (CAD) $5,281/kg TP removed

Notes:

1. Calculated based on an inflation rate of 2.5 % and an interested rate of 7.5%.

2. Additional mass of TP removed at its CofA rated capacity based on a projected effluent TP concentration of 0.30 mg/L for a seasonal discharge lagoon and an effluent TP of 0.10 mg/L for a secondary treatment plant with tertiary filters.

Upgrading the Holland Landing WPCP to a secondary treatment facility with tertiary filtration will cost an estimated $8.6M CAD with annual operating costs of approximately $320K CAD/yr. The 25-year life cycle cost is approximately $13.2M CAD. The addition of tertiary filtration is projected to result in an annual reduction of approximately 100 kg TP/yr. Over 25 years, this results in a total reduction in effluent TP loading of 2,489 kg. Based on the 25-year life cycle cost, the cost per additional kg of TP removed is estimated to be $5,281 CAD/kg TP. It should be noted that the total estimated O&M costs for the operation of the new mechanical treatment plant are included in the annual O&M costs presented in Table 3.27. Consequently, the O&M and 25-yr life cycle costs may result in overestimated incremental costs.

3.7.4 Upgrades to the Existing Facility to Achieve Effluent TP Objective

Concentrations of 0.05 mg/L

Conceptual level upgrades to the Holland Landing WPCP were developed for the construction of a mechanical plant with membrane ultrafiltration. Table 3.28 presents the incremental costs associated with upgrading the Holland Landing WPCP to membrane ultrafiltration. Included in the table are annual O&M costs and a 25-year life cycle cost.

Table 3.28 Incremental Costs to Upgrade to Secondary Treatment with Membrane Ultrafiltration for the Holland Landing WPCP

Parameter Summary

Capital Cost (CAD) $9,570,000

Annual O&M Costs (CAD) $410,000/yr

25-Year Life Cycle Cost (1) (CAD) $15,420,000

Additional TP Removed Annually (2) 124 kg/yr

Total Additional TP Removed (25-yr Total) 3,112 kg

Cost/kg TP Removed (CAD) $4,956/kg TP removed

Notes:

1. Calculated based on an inflation rate of 2.5 % and an interested rate of 7.5%.

2. Additional mass of TP removed at its CofA rated capacity based on a projected effluent TP concentration of 0.10 mg/L for a secondary treatment plant with tertiary filters and 0.05 mg/L after the installation of membrane ultrafiltration.

Upgrading the Holland Landing WPCP to membrane ultrafiltration will cost an estimated $9.6M CAD with annual operating costs of approximately $410K CAD/yr. The 25-year life cycle cost is approximately $15.4M CAD. Upgrading to a secondary treatment plant with membrane ultrafiltration is projected to result in an annual reduction of approximately 124 kg TP/yr. Over 25 years, this results in a total reduction in effluent TP loading of 3,112 kg. Based on the 25-year life cycle cost, the cost per additional kg of TP removed is estimated to be $4,956 CAD/kg TP. It should be noted that the total estimated O&M costs for the operation of the new mechanical treatment plant are included in the annual O&M costs presented in Table 3.28.

3.7.5 Incremental Costs to Upgrade to Membrane Ultrafiltration

Upgrading from a lagoon based system to a mechanical plant with membrane ultrafiltration will result in improved phosphorus removal compared to upgrading to a mechanical plant with tertiary filtration. At the same time, the capital and O&M costs for a mechanical plant with membrane ultrafiltration will be higher than the costs for a mechanical plant with tertiary filtration. Table 3.29 presents the incremental costs associated with upgrading the Holland Landing WPCP to a secondary treatment with membrane ultrafiltration compared to tertiary filtration. Included in the table are annual O&M costs and a 25-year life cycle cost.

Table 3.29 Incremental Costs to Upgrade to Membrane Ultrafiltration Instead of Tertiary Filtration for the Holland Landing WPCP

Parameter Summary

Incremental Capital Cost (CAD) $990,000

Incremental Annual O&M Costs (CAD) $90,000/yr

Incremental 25-Year Life Cycle Cost (1) (CAD) $2,270,000

Additional TP Removed Annually (2) 25 kg/yr

Total Additional TP Removed (25-yr Total) 623 kg

Cost/Incremental kg TP Removed (CAD) $3,650/kg TP removed

Notes:

1. Calculated based on an inflation rate of 2.5 % and an interested rate of 7.5%.

2. Additional mass of TP removed at its CofA rated capacity based on a projected effluent TP concentration of 0.10 mg/L for a secondary treatment plant with tertiary filters and 0.05 mg/L for a secondary treatment plant with membrane ultrafiltration.

Upgrading to membrane ultrafiltration instead of conventional tertiary filtration would result in improved phosphorus removal of 25 kg TP/yr. Over 25 years, this would result in an increase in total phosphorus removal of 623 kg. Upgrading to membrane ultrafiltration instead of conventional tertiary filtration results in an additional capital cost of $1.0M CAD, O&M costs that are nearly 28 percent greater, and a 25-year life cycle cost that is approximately $2.3M CAD greater. Incrementally, the improved phosphorus removal achieved as a result of membrane ultrafiltration over conventional tertiary filtration would come at a unit removal cost of $3,650 CAD/kg TP.

The incremental cost per unit of TP removed as a result of upgrading to a mechanical plant with membrane ultrafiltration is lower than for the upgrade to a mechanical plant with tertiary filtration. This is the result of the requirement to upgrade from a lagoon based system to mechanical treatment. The majority of the capital costs are due to the construction of the mechanical plant. The difference in 25-yr life cycle costs represents an increase of almost 17 percent, compared to an improvement in phosphorus removal of about 25 percent. The result is a lower unit removal cost for the upgrade to a mechanical plant with membrane ultrafiltration than for the upgrade to a mechanical treatment plant with tertiary filtration.

3.7.6 Summary of Conceptual Level Upgrade Costs

Based on the current configuration of the Holland Landing WPCP, the lagoon based system would require upgrading to a mechanical treatment plant with tertiary filtration in order to consistently achieve an effluent TP objective concentration of 0.10 mg/L. In order to consistently reduce effluent TP concentrations to 0.05 mg/L, membrane ultrafiltration would have to be installed. Figure 3.14 presents a side-by-

side comparison of the historic cost per kg of TP removed and the cost per additional kg of TP removed as a result of the conceptual level upgrades.

Figure 3.14 Unit Removal Costs for the Holland Landing WPCP

The cost per kg of TP removed at the Holland Landing WPCP as a result of the upgrade to tertiary filtration is about 7 percent greater than the unit cost for upgrading to membrane ultrafiltration. This is the result of a 25 percent improvement in TP removal at a cost of an additional $2.3M CAD. The cost per additional kg of TP removed as a result of upgrading from conventional tertiary filtration to membrane ultrafiltration is $3,650 CAD/kg TP.