23 The Orchard, Athlumney, Navan, Co. Meath, Ireland Tel: +353 46 907 3416 Fax: +353 1 6335315 Mob: +353 86 8327792 Email: info@rec.ie VAT No: 8282592C Registered in Ireland No: 282592 Directors: Tom Rowan, Barry Rowan 1

Client:

Ger Brickley & Nick Elliott

Kepak Kilbeggan

Title:

Kepak Kilbeggan

Waste Assimilation Capacity of Brosna River for MRP

Consultant:

Tom Rowan BE CEng MIEI HDipBS

Date:

20th September 2007

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2

1. Introduction

O Neill Groundwater Engineering (OGE) carried out a waste assimilation capacity (WAC)

on the Brosna River in March 2007. The EPA requested that the WAC should be reviewed

with particular emphasis to the receiving waters capacity to assimilate Phosphorous in

accordance with the Water Quality Standards for Phosphorous Regulations 1998 SI No. 258.

Rowan Engineering Consultants Ltd. were contracted by Kepak to review the WAC in

accordance with the EPA requirements.

2. Methodology

The Phosphorous Regulations (1998) were used to determine the assimilation capacity of the

Brosna River. The median flow and Q value for the Brosna River was calculated from

information compiled by the EPA from the Ballynagore station on the Brosna. The

Ballynagore station is located upstream from Kilbeggan and the flows from December 1986

to May 2007 have been recorded by the EPA (See figure 1 below).

Figure 1: Flow Duration Curve Table at Ballynagore (Dec 86 - May 07)

Courtesy of EPA

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3

The 50%ile flow rate (F50) for the Brosna River at Ballynagore is 3.1m3/s and the 95%ile

flow rate (F95) is 0.725m3/s. Two background samples were taken by OGE of the Brosna

River upstream and downstream from the proposed Kepak discharge point on 29th

January

2007 and a further sample was taken on 26th

March 2007. Orthophosphate was found to be

less than 20µg/l (0.02mg/l) on all three occasions.

Kepak Kilbeggan has proposed the construction of a Waste Water Treatment Plant (WWTP)

which is capable of treating the process effluent to ensure a maximum discharge

concentration of 1mg/l of Total Phosphorous. The estimated discharge Molybdate Reactive

Median Phosphate (MRP) concentration was derived using Total P = 3.07 * MRP due to

molecular weight.

3. Q Value of Brosna River

The Q value for the Brosna in 1987 was Q3-Q4. The phosphorous regulations (1998) state

that the target value for the river is Q4 by 31st December 2007. This indicates that the MRP

should be a maximum of 30µg/l (0.03 mg/l).

4. WAC Calculation

The final MRP concentration of the river as a result of the Kepak WWTP discharge can be

calculated as follows:

Final P conc = (Effl conc * Effl vol) + (Median River conc x River Flow med)

River flow med + Effl vol

Symbol Explanation Kepak / Brosna Value

Final P conc Final River water concentration

MRP

The Phosphorous regulations state that this must

be a maximum of 0.03mg/l MRP

Effl conc Concentration of MRP from the

proposed effluent from Kepak

WWTP

0.325 mg/l MRP

(1mg/l P)

Effl vol Volume of effluent to be

discharged from Kepak WWTP

0.0035m3/sec

(300m3/day)

River conc Background Median river

concentration of MRP

0.02 mg/l MRP

River Flow med F50 flow for the river 3.1m3/sec

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4.1 WAC using F50 with WWTP discharging 1mg/l P.

We calculated the Phosphorous concentration if the WWTP discharged effluent at 1mg/l

using the 50%ile flow rate for the river at Ballynagore (F50).

Figure 2: Final River Phosphorous Concentration using F50

Parameter Units Value

Effluent Concentration (Total P) mg/l 1

Effluent Concentration (MRP as Total P / 3.07) mg/l 0.325733

Effluent Volume m3/s 0.0035 300 m

3/day

River Concentration (MRP) mg/l 0.02

Median River Flow F50 m3/s 3.1 267840 m

3/day

0.063131

3.1035

0.0203 mg/l

20.34 µg/l

Phosphorous Regulations Permissable Concentration 30 µg/l

(Effl conc * Effl vol) + (Median River conc x River Flow med)

River flow med + Effl vol

Final River Concentration

Final River Concentration

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4.2 WAC using F95 with WWTP discharging 1mg/l P.

We also calculated the Phosphorous concentration if the WWTP discharged effluent at 1mg/l

using the 95%ile flow rate for the river at Ballynagore (F95). This was calculated in section 2

above as 0.725m3/s.

Figure 3: Final River Phosphorous Concentration using F95

Parameter Units Value

Effluent Concentration (Total P) mg/l 1

Effluent Concentration (MRP as Total P / 3.07) mg/l 0.325733

Effluent Volume m3/s 0.0035 300 m

3/day

River Concentration (MRP) mg/l 0.02

95%ile River Flow F95 m3/s 0.725 62640 m

3/day

0.015631

0.7285

0.0215 mg/l

21.46 µg/l

Phosphorous Regulations Permissable Concentration 30 µg/l

(Effl conc * Effl vol) + (Median River conc x River Flow med)

River flow 95% + Effl vol

Final River Concentration

Final River Concentration

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4.3 WAC using F50 with WWTP discharging 2mg/l P.

We also calculated the Phosphorous concentration if the WWTP discharged total

Phosphorous of 2mg/l using the 50%ile flow rate for the river at Ballynagore (F50).

Figure 4: Final River Phosphorous Concentration discharging 2mg/l using F50

Parameter Units Value

Effluent Concentration (Total P) mg/l 2

Effluent Concentration (MRP as Total P / 3.07) mg/l 0.651466

Effluent Volume m3/s 0.0035 300 m

3/day

River Concentration (MRP) mg/l 0.02

Median River Flow F50 m3/s 3.1 267840 m

3/day

0.064262

3.1035

0.0207 mg/l

20.71 µg/l

Phosphorous Regulations Permissable Concentration 30 µg/l

(Effl conc * Effl vol) + (Median River conc x River Flow med)

River flow med + Effl vol

Final River Concentration

Final River Concentration

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7

5. WAC Results

Section 4 above shows the calculation used and the results based on the information outlined

above. It indicates that if the WWTP discharge effluent contained 1mg/l of total phosphorous

that the background MRP value of the river would be 20.34µg/l at the median flow and

21.17µg/l at 95%ile flow. It also indicates that if the WWTP discharge effluent contained

2mg/l of total phosphorous that the background MRP value of the river would be 20.71µg/l

at the median flow

6. Conclusion

The calculations have shown that if Kepak Kilbeggan WWTP discharge concentrations

adhere to the proposed total Phosphorous limit of 1mg that the expected MRP concentration

of the Brosna River will be within the 30µg/l required by the Phosphorous Regulations. It

also indicates that the Brosna River has the capacity to assimilate discharge concentrations of

total Phosphorous of 2mg/l.

The Brosna River has the assimilation capacity to assimilate the discharge from the proposed

Kepak Kilbeggan WWTP.

Signed: _________________ Dated: ________________

Tom Rowan

BE CEng MIEI HDipBS

Managing Director

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8

Appendix 1

Certificates of Analysis

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