1                                            Introduction

1.1                                      Background to the Study

The Hongkong Electric Company, Limited (HEC) is planning to retrofit the two existing 350MW coal-fired generating Units L4 and L5 of Lamma Power Station with Flue Gas Desulphurisation (FGD) plant for reducing sulphur dioxide emissions in support of Government policy to improve the air quality of the Pearl River Delta.

It is proposed to adopt the “Wet Limestone-Gypsum” process for the FGD plants, a technology which is already used in, and proved effective and reliable for the existing coal-fired units L6, L7 & L8.

The proposed FGD process involves directing the flue gas from the boilers of Units L4 and L5 to FGD plants, in which limestone slurry is introduced to react with flue gas for removal of SO2, before discharging to the chimney.  As a result, besides a significant reduction of the SO2 concentration in the flue gas, the temperature of flue gas entering the chimney will be reduced, waste water from the FGD absorber will be produced and gypsum will also be produced as a by-product.

1.2                                      Purpose and Scope of the EIA

The Project is classified under EIAO as a material change to an exempted designated project, the Lamma Power Station as a Public Utility Electricity Power Plant (Item D.1 Part I Schedule 2 of the EIAO Chapter 499), because of the changes induced by the FGD operations to the types and quantities of emissions, wastes and effluents. In addition, the demolition of two existing Light Oil Tanks is a designated project under item 16 Part II (Decommissioning Projects) Schedule 2 of EIAO (i.e. a store for oil with a storage capacity exceeding 200 tonnes). 

The main objective of this Environmental Impact Assessment (EIA) study is to provide a detailed assessment of the nature and extent of potential environmental benefits and impacts arising from the construction and operation of the Project in relation to the issues specified in the EIA Study Brief (No. ESB-133/2005), including air quality, noise, water quality, waste, land contamination and landscape and visual impacts.