Researchers at Khulna University of Engineering and Technology (KUET) described work on turning human waste, sewage sludge and agricultural residues into diesel-rich bio-crude using hydrothermal liquefaction (HTL) on 3 October. Bangladesh Sangbad Sangstha reported that the project has been under way since 2016 with 13 researchers participating. The team initially explored petrol- and octane-range components from human waste and sewage-treatment sludge, reporting a bio-crude yield of 50–55% in laboratory experiments. It later shifted toward diesel-rich output, citing estimates that diesel accounts for a large share of Bangladesh’s liquid-fuel imports. Researchers said mixing the waste feedstock with rice husk and sawdust produced bio-crude containing more than 50% diesel-range components. These are results reported by the research team, not certification of a commercial fuel or evidence of continuous-plant performance. The distinction matters because a laboratory yield and the share of diesel-range material in the resulting crude describe different properties and do not by themselves show how much finished fuel a plant could deliver.

HTL is intended to process wet organic material under high temperature and pressure without first drying it, converting the feedstock into bio-crude that can later be refined. The report says the work includes human waste and sewage sludge as well as agricultural residues. Researchers estimated that diesel represents roughly 70–75% of Bangladesh’s liquid-fuel imports and that the country spends about US$3.5–4.0 billion a year in foreign exchange on those imports. Both are contextual ranges attributed to the research team; neither is a measured saving from this project or a production figure. BSS also reported the team’s statement that its work had produced more than 15 papers in international scientific journals, including Q1-ranked journals, and that initial support came from the government’s Power and Energy Research Council about a year earlier. The article attributes those claims to the researchers. It does not review the papers, establish the amount or timing of funding, or provide an independent technical assessment of the process.

The proposed next step is not an immediate move from laboratory tests to a large commercial plant. Researchers proposed first building a continuous pilot capable of processing one to three tonnes a day, then validating the technology, securing certification and developing an appropriate regulatory framework. The report gives an investment estimate of Tk 80–120 crore for a commercial plant designed for three tonnes a day. That is a research-team estimate, not a completed investment, approved project budget or operating facility. The researchers said commercial production might begin within a year of investment, which is conditional rather than a dated commitment. A pilot would need to test whether laboratory results hold under sustained operation, whether waste can be collected consistently and whether the product meets applicable fuel specifications. The source provides no confirmed site, financing arrangement or start date for a pilot, so none can be inferred from the proposal.

The team’s wider scenario estimates that processing 25–50% of human waste, sewage sludge and wet organic waste could replace 10–15% of crude-oil imports and save Tk 6,500–13,000 crore in foreign exchange annually. Those are modelled possibilities dependent on feedstock collection, technical performance and expansion; they are not observed reductions in imports or realized savings. The report also describes potential to meet around 30% of diesel demand if commercial-scale implementation succeeds. That is a separate claim with a different denominator and condition, not a figure that can be combined with the crude-import scenario. Any future assessment would need independently checked laboratory results, pilot output and uptime, feedstock logistics and costs, refining requirements, and fuel-standard results. The current report documents a research programme and a proposed demonstration path. It does not document a built waste-to-fuel plant, a verified national substitution rate or commercial supply to consumers.