Energy Consumption. The main fuels for the kilns are coal and pet coke (up to 240kt/yr). Since 2009, alternative fuels for the kilns have been used as a replacement for fossil fuels. The current substitution rate is approx. 20%, consisting mainly of biomass, used tires, used oils and solid recovered fuel (SRF). The new kiln 6 aims at substituting up to 70% of fossil fuels. Thermal consumption of new kiln 6 will be within the range reflective of Best Available Techniques (BAT) defined by the 2013 EU BAT Reference Document for the sector, and within the benchmark set by the WBG EHS Guideline for Cement and Lime Manufacturing.
In addition, the electricity requirement for the new kiln 6 will be within the guidelines provided by the WBG EHS Guideline for Cement and Lime Manufacturing. 50% of the electricity will be provided through the national grid and the remaining by onsite supply including a 24 MW HFO fuelled plant, 3MW gas fuelled plant and 6.9 MW solar plant.
Water Supply. The SOCOCIM plant uses about 400,000 m3/year of water, provided by the network (SEN Eau) and rainwater reutilization. The manufacturing process is essentially dry, and most of the water will be used primarily for cooling, grinding, high pressure cleaning, dust suppression, fire network, sanitary facilities. The plant water needs after Project installation will be significantly reduced due to Project design, leading to an economy of 150,000 m3/year as compared to current plant usage.
Greenhouse Gas Emissions. The project gross emissions are estimated at 1,700k tCO2eq/year for kiln 5 and 6. For comparison, GHG emissions of the business-as-usual scenario (kiln 3 and kiln 4 in operation) would be over 2,000k tCO2eq/year. Hence, the Project would generate a reduction of more than 300k tCO2eq/year of greenhouse gas emissions.
Air Emissions and Ambient Air Quality. The principal sources of air emissions at the SOCOCIM plant are the clinker production and grinding operations including limestone quarrying activities and transfer to site (via truck haulage), storage and handling of clinker, limestone, basalt and coal at the plant, transfer and bagging of cement, as well as transportation along the site access road. Measures are implemented to reduce dust levels such as filters, roads cleaning and watering. Also, the existing conveyors are enclosed, to reduce dust emissions.
Results of annual ambient air quality monitoring show elevated dust levels (PM10) within the site, at the site boundary and in the residential area, as well as SO2 at the site boundary. Monitoring of the kiln 5 and the on-site power plant stack air emissions currently shows exceedance of WBG EHS Guidelines. The Project is designed to significantly reduce dust emissions with: best available technology (including single bag filter design); replacement of existing coal mill; no more clinker imports and less clinker handling; increase of inside clinker storage capacity; and one single crusher for raw materials instead of two, equipped with a powerful bag filter. In addition, incoming and outgoing trucks will be routed through a new concrete road from national road to the crusher (as opposed to laterite track presently). SOCOCIM will conduct monitoring of current and future emissions to identify and address any non-compliance with national and WBG EHS Guidelines, per ESAP # 3.1 and ESAP #3.3.
SOCOCIM is in the process of commissioning an air quality impact assessment to characterize air emissions and any impacts on ambient air quality resulting from the project. The study will i) assess baseline air quality, ii) undertake scenario based modelling per good international industry practice accounting for the likely air quality in the neighboring community areas based on expected operations and iii) propose mitigation measures to achieve compliance with the applicable national standards and WBG EHS Guidelines ahead of full operations per ESAP #3.2.
Ambient air quality monitoring during construction activities will be planned and implemented as per ESAP # 1.2.
Noise and vibration. Noise is generated by operation of plant equipment, quarrying activities including infrequent blasting, and operations-related traffic. Annual ambient noise monitoring results indicate noise level exceedance of WBG EHS Guidelines in the resident areas close to the plant boundaries.
The main source of vibration is blasting activities at the limestone quarries. There is a maximum of 3 blasting per day in Bargny, carried out only during daytime and at a fixed time. As described further in the stakeholder engagement section below, community concerns and complaints about noise and vibration caused by blasting practices at the quarry sites have been received. Monitoring of blasting vibrations is systematically conducted at the Bargny quarry. Monitoring for the past three years shows no exceedance of the defined threshold (French standard to avoid damage). SOCOCIM’s Noise & Vibration Management Plan will include regular monitoring for eventual structural defects at site buildings, as well as at any buildings in the neighboring communities (ESAP #1.3).
SOCOCIM is commissioning a noise and vibration impact assessment study to assess the impact of the Project on ambient noise and vibrations during the operations phase through quantitative noise modelling and identify mitigation measures, as required, to achieve compliance with the applicable national/local standards and WBG EHS Guidelines per ESAP #3.4.
Solid Waste Management. The main waste types generated in SOCOCIM operations include, food, paper and cardboard, scrap metal, used oils, oiled rags, plastics, wooden pallets, electronic waste. SOCOCIM established a Waste Management Procedure. Waste is segregated at the site and waste streams are mainly recycled (Objective: zero waste to the landfill). All waste with calorific value (paper and cardboard, used oil, oiled rags, solvents, plastic, wood etc.) is collected and used in the kilns as combustible material. Used tires from garages and parking lots and waste from health-care activities from the internal infirmary, are also collected and treated as alternative fuels. Scrap metal is sent out for recycling. Raw material residues (as well as waste clinker and cement) are collected and recycled in the process at a rate of 90%, to be improved to full recycling with the acquisition of a new vacuum truck. Fuel and hydrocarbon storage areas are equipped with oil/water separators. In addition, the VICAT Group aims to increase the share of regional waste recovered in its production units (through the use of alternative fuels).
Wastewater Management. There are few wastewater sources at the plant other than sanitary facilities. Sanitary wastewaters are collected for treatment in an offsite wastewater treatment plant. Liquid waste from workshops or spills are collected in drains for energy recovery. Stormwaters from the plant are collected in drains discharging in a basin within the SOCOCIM site, then overflowing without pre-treatment outside the site to an open canal (regularly scraped by SOCOCIM) (ESAP #3.5).
All Project installations will be equipped with a stormwater drainage system equipped with grates to minimize the quantity of suspended solids in the water, connected to the existing network. Stormwaters from the quarry are drained to lakes located within the quarry, to be reused within the process (for firewater and dust suppression mainly). As part of the Project, there is a plan to improve rainwater recuperation in the quarry and add treatment (filtration) for improved use in the plant.
Hazardous Materials Management. The main hazardous materials in production include energy sources (coal and pet coke, fuel), engine oils and lubricants, laboratory materials. Hazardous materials storage and the gas fuelling area are equipped with secondary containment. Emergency response equipment (absorbents) are available. During construction, hazardous materials will include: fuel, lubricants, hydraulic fluids, paints and solvents, concrete additives, forming oils, detergents. The construction ESMP will include a plan for the proper storage and handling of hazardous materials (ESAP #1.2).
Quarry Closure & Rehabilitation. Some (limited) sections of the quarries are rehabilitated as the exploitation works progresses. SOCOCIM established an action plan related to quarry management, which includes reforestation activities and partnership discussion with Water and Forest authorities (Eaux et Forêts). However, SOCOCIM will prepare a quarry closure and rehabilitation plan in line with WBG EHS guidelines and Good International Industry Practice (GIIP), to meet the objectives of physical, chemical and ecological habitat integrity and including estimated timelines and cost (ESAP #3.6).