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Shatin Sewage Treatment Works Expansion

Population Equivalent (0.06kg / day)


Peak Flow

1,020 Mld / day

Stage I and II Aeration Tank Retention Time

Eight hours

1991 Revised Aeration Tank Retention Time

11 hours

Stage I and II Capacity

205,000 cubic metres / day

1991 Revised Capacity

150,000 cubic metres / day

Current Capacity

340,000 cubic metres / day

Typical wastewater loadings

BOD<span class="sup">5</span>

57,000 kg / day


67,000 kg / day


15,700 kg / day

Chloride ions

2,000 to 7,000mg / l

Wastewater temperature

15 to 32&#176;C

Final effluent quality

BOD<span class="sup">5</span>

20 mg / l (at 95 percentile) 40 mg / l (max)


30 mg / l (at 95 percentile) 60 mg / l (max)

Total Nitrogen

20 mg / l (annual average) 35 mg / l (max)

NH<span class="sup">3</span>-N

5 mg / l (annual average) 10 mg / l (max)

UV project cost

&#36;124 m HKD ($16 m)

Expansion project cost

&#36;2,425 m ($312 m)

Plant Owner

Hong Kong Drainage Services Dept

UV Disinfection Contractor

Jardine Engineering

Other Contractors

Biwater, Leader Civil Engineering, Sun Fook Kong, Hydrotech Professional, Hang Kee Construction &amp; Engineering, ATAL Engineering Ltd and China Railway Engineering Corporation

Stage I commissioned


Stage II commissioned


Stage III expansion began

April 2001

Stage III completion

September 2004

UV project completed

December 2009

Expansion project completion

August 2010