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 Md. Al Mamun
Md. Al Mamun
30 November 2025 at 3:38 am

Inquiry Regarding the Potential Use of Household Waste for Biochar Production.

Hello Everone,

My name is Md. Al Mamun, and I am from Bangladesh, a country classified by the World Bank as a lower-middle-income nation. I have a strong interest in biochar, and I have been a member of the International Biochar Initiative (IBI) since 2020.

Bangladesh is one of the most densely populated countries in the world. The estimated population in 2025 is approximately 176.4 million, making it the 8th most populous country globally. The population density is extremely high — roughly 1,350 people per km² (or about 3,496 people per square mile).

In terms of natural resources, Bangladesh’s formal forest area has historically fluctuated, with estimates placing national forest cover at around 10% to 17% of total land area, depending on whether the assessment includes natural forests, mangroves, or plantations. Due to the country’s high population density and limited forest resources, large-scale harvesting of trees for biochar production is neither feasible nor sustainable.

However, Bangladesh has a very large number of households — exceeding 41 million — which collectively generate significant amounts of waste every day. The typical composition of household waste in Bangladesh is as follows:

Organic / food / kitchen waste: ~50–60%

Plastic & packaging: ~15–25%

Paper & cardboard: ~5–10%

Glass: ~2–5%

Metal (cans, etc.): ~1–3%

Residual / mixed / sanitary / non-recyclable waste: Remaining proportion (varies)

Given this waste composition and the scale of household waste generation, I am interested in exploring the feasibility of converting these waste streams into biochar. My goal is to utilize available resources in a sustainable manner, reduce environmental pollution, and promote circular-economy practices within Bangladesh.

I kindly request your guidance or recommendations regarding the following:

-> Is it technically feasible to produce biochar from these types of household wastes?

-> Which specific waste fractions (e.g., organic waste, paper, biomass residues) are most suitable for biochar production?

-> Could you please suggest individuals, organizations, or research groups who are currently working in this field—particularly those focusing on waste-to-biochar technologies?

-> Are there any documented case studies or best practices involving biochar production from mixed household waste in developing countries?

Any advice, reference, or contact information would be greatly appreciated.

Thank you very much for your time and consideration. I look forward to your guidance.

Sincerely,

Md. Al Mamun

Member, International Biochar Initiative (Since 2020)

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  • Luisa Marin

    30 November 2025 at 11:11 am

    Household Waste-to-Biochar in Bangladesh — Key Considerations

    Thank you for your long-standing participation as an IBI member since 2020. Your question addresses an important topic for many high-density, resource-constrained regions.

    1. Can household waste be used for biochar?

    Only specific, source-separated fractions can be used safely.

    Mixed municipal solid waste (MSW) is not acceptable feedstock for any soil-use biochar under recognized standards (IBI, EBC, Puro.earth). Plastics, diapers, contaminated paper, metals, and synthetic materials produce hazardous residues during pyrolysis and make the resulting char unsuitable for environmental or agricultural use.

    2. Which fractions are suitable?

    Potentially suitable (if clean and separately collected):

    • Kitchen/food organics
    • Clean, uncoated paper & cardboard
    • Garden/green waste
    • Household agricultural residues (rice husk, jute sticks, coconut shells)

    Critical constraint:

    High moisture content in food waste and many organic fractions in Bangladesh can make pyrolysis difficult, inefficient, and costly. Drying, pre-processing, or co-feeding with drier biomass is often necessary.

    Not suitable:

    • Plastics and multilayer packaging
    • Sanitary waste & diapers
    • E-waste, metals, batteries
    • Coated/laminated paper

    These materials should never enter a pyrolysis system intended for agricultural or environmental applications.

    3. Biochar from mixed MSW must not be used on soil or with animals

    Char derived from mixed household waste often contains:

    • Heavy metals
    • PFAS and persistent chemicals
    • Chlorinated compounds
    • PAHs and other toxic residues

    Because of this, it is not safe for:

    • Soil application
    • Crop production
    • Animal bedding/feed
    • Any use connected to food systems

    4. Lab characterization is essential

    Even when using source-separated organic waste, a full laboratory analysis is mandatory before determining safe use. Testing should include:

    • Heavy metals
    • PFAS (where possible)
    • PAHs
    • Chlorine and ash content
    • Any potential contaminants from dyes, inks, coatings, adhesives

    Without characterization, the material’s safety cannot be evaluated.

    5. Realistic approach for Bangladesh

    A viable pathway is to focus on segregated organics and clean biomass residues, potentially combined with composting or biogas systems. Converting mixed household waste into agricultural biochar is not recommended under current global safety and certification requirements.

    If any members have experience with urban-waste segregation, community-scale pyrolysis, or lab testing of waste-derived biochars, their insights would be valuable to continue this exchange.

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