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Regional Collaboration

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Shenzhen River Sediment Remediation

The Shenzhen River is the boundary river between the Hong Kong Special Administrative Region and the Shenzhen Special Economic Zone. As the regulation of the River is a joint task between the governments of the both sides, a Joint Working Group (JWG) has been set up to manage the implementation of the Shenzhen River Regulation project. The JWG is led by the Development Bureau on the Hong Kong side, with membership from various departments.

Because of heavy pollution from wastewater with domestic, industrial and agricultural origin flowing into the river from both the Hong Kong and Shenzhen areas in the past, coupled with the relatively slow river flow, large quantity of pollutants had deposited in the riverbed sediment, leading to odour problem. In view of the above, the JWG agreed to commission the “Shenzhen River Contaminated Sediment Remediation Strategy Joint Study”. The Study, which has been entrusted to the Shenzhen River Regulation Office of the Shenzhen Municipal Government for management, is intended to explore feasible options to effectively mitigate the existing environmental problems associated with the contaminated sediments in Shenzhen River.

The JWG endorsed the Study's Final Report in February 2015. The Study recommends in-situ bioremediation as the major technology to abate the odour, supplemented by ex-situ solidification/stabilization to treat the dredged sediments. However, to effectively remediate the contaminated sediments in Shenzhen River, it is crucial to firstly rectify pollution at source, that is, to control pollution sources and wastewater discharges in the catchment of Shenzhen River before treating the contaminated sediments. To achieve a long-lasting effect, the sediment remediation works may be considered for implementation after the pollution loads to Shenzhen River has been effectively reduced, or the water quality of Shenzhen River has improved. Otherwise, new pollution loads will generate sediment contamination and odour problem. Hence, both Shenzhen and Hong Kong governments are now tackling pollution at source to effectively rectify the water pollution problem, before sediment remediation works are implemented.

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Shenzhen River
Shenzhen River

 

 

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