Verdel Engineering & Consulting Limited promotes knowledge sharing, applied research, and evidence-based approaches to environmental and engineering challenges. This section highlights selected technical publications and research contributed by members of our professional team in environmental remediation, waste management, sustainable materials, microalgae cultivation, and resource recovery.

Selected Publications

Bioremediation of Hydrocarbon-Contaminated Site Using Nitrogen, Phosphorus, Potassium and Urea: A Case Study of Ogoni Clean-Up

Ezeani, S.E. & Bell-Gam, W.I.
International Journal of Science and Research Archive, 2024, 12(02), 236–246.

This case study examined the ex situ bioremediation of hydrocarbon-contaminated soil in Ogoni Land, Rivers State. Contaminated soils were treated in an engineered biocell using nutrient amendments consisting of NPK fertilizer and urea to enhance microbial activity and hydrocarbon degradation. Treatment conditions were adjusted in response to contaminant depth and concentration, while periodic soil sampling and analysis were used to monitor Total Petroleum Hydrocarbon reduction. The study demonstrates the practical application of nutrient-enhanced bioremediation for petroleum-contaminated soils.

Key areas: Hydrocarbon remediation • Soil bioremediation • Petroleum contamination • Biocell treatment • Environmental restoration

Comparative Evaluation of the Compressive Strength of Treated Drill Cutting Blocks and Sandcrete Blocks

Ezeani, S.E

International Journal of Science and Research Archive, 2024, 12(02), 656–663.

This research examines the potential use of treated drill cuttings in block production by comparing their compressive strength with conventional sandcrete blocks. The study is relevant to waste recovery, sustainable construction materials, and improved management of drilling wastes.

Key areas: Waste management • Resource recovery • Drill cuttings • Sustainable construction

Optimization of Batch Cultivation of Chlorella sp. Using Response Surface Methodology

Ezeani, S.E. & Abu, G.O.

Current Journal of Applied Science and Technology, 36(4), 1–14.
DOI: 10.9734/cjast/2019/v36i430245

This study applied Response Surface Methodology to optimise the cultivation of Chlorella sp. using NPK 20:20:20 as a relatively low-cost growth medium. The findings showed that nitrogen concentration and pH were the most influential factors affecting biomass and chlorophyll production, with optimum biomass achieved at approximately 0.5 g/L nitrogen and pH 8.5. The research demonstrates the potential for optimising locally available fertilizer-based media for more efficient microalgae biomass production.

Key areas: Microalgae cultivation • Process optimisation • Response Surface Methodology • Biomass production • Sustainable biotechnology

Commercial Microalgae Culture in Inorganic Fertilizer Media

Ezeani, S.E. & Abu, G.O.

Current Journal of Applied Science and Technology, 38(4), 1–9.
DOI: 10.9734/cjast/2019/v38i430372

This research investigated the use of locally available NPK agricultural fertilizers as alternative media for cultivating Chlorella species. The study found that a composite NPK 15:15:15 and BG11 medium produced biomass and chlorophyll results close to those obtained with conventional BG11 medium, indicating the potential of inorganic fertilizer as a cost-effective and locally available option for commercial microalgae biomass production.

Key areas:
Microalgae cultivation • Biomass production • Inorganic fertilizer media • Resource efficiency • Sustainable biotechnology