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Heterogeneous composite wastes from landfills were evaluated as precursors for the generation of activated carbon (AC). A single-step chemical activation process was applied involving irradiation with microwave energy and impregnation with KOH. The average percentage yield of AC from active landfill precursor was higher than that from closed landfill for all depths sampled. Increase in impregnation ratio and irradiation power decreased the average percentage yield for both landfill precursors (active: 38.1 to 33.1%; closed: 42.1 to 33.3%). The optimum pH range for adsorption of methylene blue was pH 6-7, while adsorption increased with increase in temperature over the range 30 to 50°C. Carbonyl and hydroxyl groups were the major functional groups on the surface of AC. The properties of the AC are potentially suitable for the removal of cationic dyes and pollutants. AC generated from the landfill composite was comparable to that from other biomass being managed through AC generation. This is the first report to demonstrate the possible reuse of landfill composite as AC. The reuse option of landfill composite could provide a means of sustainable management of landfilled municipal waste.

Purpose This study aims to empirically investigate the relationship between corporate social responsibility (CSR) and sustainable management of wastes and effluents (SMWE) in Lagos Megacity. Design/methodology/approach The paper adopts a quantitative research method, specifically the use of a Web-survey technique for eliciting responses from a cross-section of companies affiliated to the Lagos Chambers of Commerce and Industry (LCCI). From a target population of 2,300 companies, a sample of 92 companies was drawn using the sample determination formula of Parten (1950). The 92 sampled companies were randomly administered Web-based questionnaires through their official emails. Finally, the 56 responses received from the participating companies (corresponding to 61 per cent response rate) were analysed electronically and the results presented using descriptive and inferential statistics. Findings The results show strong positive relationships between CSR and advocacy on waste and effluents (0.7), environmental impact response (0.7), environmental sustainability policy (0.6) and preventive negative impact (0.6) with P < 0.05. However, weak positive relationships exist between CSR and monitoring mechanisms (0.3) and adequacy of infrastructure for wastes and pollutants management (0.4). Overall, there is a significant positive relationship between CSR and sustainable management of solid wastes and effluents in the sampled companies in Lagos. Research limitations/implications The research is limited to Lagos Megacity because it is the industrial and commercial hub of Nigeria. Besides, there are several industrial associations in Lagos, but the selected association was the LCCI with 56 sampled companies. Practical implications The research supports and validates the theory of planned behaviour (TPB), which explicates that performance behaviour of organisations is influenced by the behavioural intention and behavioural control. However, behavioural intention of organisations may be carried out, abandoned or revised based on ever changing circumstances or contexts. Originality/value The study bridges the gap between theory and practice of environmental CSR by enriching the understanding of academics and practitioners on CSR and environmental sustainability relationships in Lagos Megacity.