Hong Kong Government Environmental Protection Department, China

Issue

Hong Kong produces nearly three million cubic metres of effluent per day which is converted into 1 200 tonnes of sewage sludge. This volume will reach 2 000 tonnes per day in 2030. Until 2015, this sludge was either buried or released into the sea.

The customer's objectives

• Provide a state-of-the-art, sustainable incineration technology solution to the massive and growing volume of sewage sludge.

• Raise public awareness on the environment.

Veolia's solution

Design, build, and operate the world's largest wastewater treatment plant: T•PARK.

Innovation

Fluidised bed incinerator technology reduces waste production by 90 % resulting in just 10 % being sent to landfills.

Technologies

• Incineration: sludge inflow, fluidised bed incineration, and steam boilers.

• Treatment of gas emissions: DeNox to control nitrogen oxide emissions, dry reactor to reduce acid gases, multi-cyclone filter and pocket filter.

• Water treatment: Multiflo™, reverse osmosis.

• Wastewater treatment: flocculation, MBBR.

Customer benefits

Energy independence

T•PARK is 100 % energy independent with two 14 MW turbines that operate with steam produced during sludge incineration. When the plant is operating at full capacity, it produces nearly 2 MW of surplus electricity which is injected into the public grid.

Comprehensive water management

T•PARK is 100 % self-sufficient in clean water - supplied by the on-site seawater desalination plant - and process water - rainwater collection and wastewater treatment to achieve ‘zero liquid discharge’.

Waste recovery

T•PARK diverts 90 % of Hong Kong sewage sludge from landfills. The plant operates with the thermal energy produced during sludge incineration, which is recovered and converted into electricity.

Innovative and ecological architecture

Symbol of the waste to energy journey and the city's green ambition, the T•PARK complex includes:

• an educational and recreational centre for the public with a 2 800 m² interactive sludge treatment exhibit;

• a 9 800 m² landscaped and ecological garden dedicated to restoring and preserving biodiversity;

• a theatre, an environmentally responsible café, a spa with three heated pools, and a rooftop terrace with breath-taking views of Deep Bay and Shenzhen.