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Lasse Leponiemi

Chairman, The HundrED Foundation
first.last@hundred.org

Classroom-Based Decentralized Composting Model

Leveraging K-12 education to systematically build long-term demand for decentralized composting.

Food waste remains a leading component of municipal solid waste, generating methane and increasing disposal costs while composting infrastructure remains underdeveloped. Residential-first campaigns have failed to create durable behavior change or sustained demand. Our innovation embeds standardized, low-cost worm-based composting systems directly inside classrooms, integrating NGSS curriculum.

Overview

Information on this page is provided by the innovator and has not been evaluated by HundrED.

Updated February 2026
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All students
Target group
We seek to use public school systems as structured platforms to drive public education and demand for affordable, accessible composting infrastructure. Schools reach nearly every household and operate with routine and accountability. Embedding composting into daily practice builds informed citizens, normalizes source separation, and generates measurable demand signals that support infrastructure.

About the innovation

Why did you create this innovation?

I created this innovation after recognizing a structural gap in the way the United States approaches organic waste diversion. Food waste is one of the largest components of municipal solid waste, yet composting infrastructure development consistently lags because demand signals are weak, fragmented, and inconsistent. Residential education campaigns often rely on voluntary participation, sporadic behavior change, and unclear operational pathways. As a result, communities struggle to justify sustained infrastructure investment.

At the same time, schools represent one of the few institutions that reach nearly every household regardless of income level, political affiliation, geography, or belief system. They operate on routine, repetition, and accountability. When composting becomes embedded into the school week, students practice source separation consistently rather than occasionally. Repetition builds competence. Competence builds confidence. Students carry those habits home, influencing household behavior in a measurable way.

I initially tested simple bucket-based worm systems and observed that small, low-cost models could function reliably inside classrooms with minimal risk and limited space requirements. The insight was not simply that composting could be taught, but that it could be standardized, replicated, and supported at scale using structured onboarding, defined material inputs, and clear operating procedures.

What does your innovation look like in practice?

In practice, the innovation follows a phased implementation model that begins small and scales strategically within a school system.

Phase one introduces a standardized vermicomposting garden kit into a single classroom. Each kit includes calibrated worm populations, engineered bedding substrate, contamination controls, feedstock protocols, and defined operating procedures suited for indoor academic settings. Students measure food scrap inputs, monitor moisture and decomposition variables, and document diversion data, turning the unit into a controlled biological processing system aligned with science standards.

Phase two expands horizontally into additional grades and classrooms using the same standardized infrastructure and training model. Replication builds operational consistency and normalizes source separation behaviors across the school environment.

Phase three conducts a formal food waste audit using aligned materials and methodology. Students quantify cafeteria waste streams, categorize organic fractions, and calculate diversion potential. The audit produces defensible baseline data to inform reduction strategies and operational planning.

Phase four installs share tables and structured food rescue protocols to reduce edible food disposal. This directly decreases landfill-bound waste while reinforcing systems literacy and responsible resource management. As landfill tonnage declines, schools identify measurable reductions in waste hauling costs.

How has it been spreading?

In 2021, the model began as a grassroots effort in Arizona, distributing bucket-based worm systems at local community events to test feasibility and educator interest. In 2022, the organization formally registered and transitioned from informal distribution to a controlled school-based pilot, refining operating procedures, educator onboarding, and risk protocols.

In 2023, the program expanded beyond a single site into coordinated multi-school implementation. Standardized starter kits replaced ad hoc materials, and structured educator training ensured consistency across classrooms. Documentation, diversion tracking, and curriculum alignment strengthened credibility and transferability. In 2024, the model scaled to 110 sites across 10 states. Replication was driven through clear implementation guides, centralized logistics, defined cost structures, and remote onboarding systems. Thousands of educators and students participated, demonstrating cross-regional adaptability in varied socioeconomic and geographic contexts.

In 2025, the program surpassed 250 schools across 25 states, integrating workforce awareness and decentralized infrastructure planning into the model. Expansion increasingly relied on institutional referrals, educator networks, and grant-funded activation rather than direct outreach alone.

By late 2026, the model is projected to reach 500 schools in all 50 states, alongside 150 additional public institutions including libraries and nonprofit community spaces.

How have you modified or added to your innovation?

The program has evolved through a structured feedback loop between educators, students, and our organization. Implementation data, educator surveys, troubleshooting logs, and classroom observations are reviewed each semester to refine curriculum, guidance, controls, and assessment tools. This process strengthens reliability across varied contexts.

Originally designed primarily for STEM alignment, the curriculum has expanded in response to educator demand from outside traditional science departments. Teachers requested integration pathways that connect composting to economics, local history, agriculture, and visual arts. In response, interdisciplinary modules are being developed that examine material cycles through economic systems, municipal budgeting, agricultural practices, environmental policy history, and creative documentation.

This expansion maintains core scientific rigor while increasing alignment with state standards across multiple subject areas. Economic units analyze waste hauling costs, avoided landfill fees, and circular market dynamics. History modules examine soil management practices and industrialization impacts. Arts components support visual data storytelling and community engagement.

If I want to try it, what should I do?

To pilot the model, begin with a single classroom rather than a full school rollout. Identify one educator willing to integrate composting into existing science standards and commit to routine implementation for one academic term.

Acquire a standardized indoor vermicomposting system with calibrated worm populations, bedding substrate, contamination controls, and written operating procedures. Ensure the unit is placed in a temperature-stable indoor location with clear feedstock guidelines limited to approved fruit and vegetable scraps. Establish a defined weekly maintenance schedule covering moisture balance, aeration, and visual inspection.

Provide educator onboarding that covers biological decomposition processes, carbon-to-nitrogen balance, contamination prevention, and student safety protocols. Integrate composting into structured lessons rather than treating it as an extracurricular activity. Students should log food scrap inputs, monitor environmental variables, and document diversion weights to generate measurable data.

After 8 to 12 weeks of stable operation, evaluate performance. Review contamination rates, diversion totals, educator workload, and student engagement. If successful, replicate the model in additional classrooms using the same standardized system and training.

To expand beyond classroom scale, conduct a baseline food waste audit using established methodology, quantify landfill diversion potential, and assess opportunities to grow.

Media

Implementation steps

Select a Classroom Pilot and Implementation Lead
Identify one teacher and one school contact responsible for execution. Confirm an indoor location that is temperature-stable, accessible, and protected from custodial disruption. Define weekly time ownership for maintenance and data logging. Set a simple launch timeline (2 weeks prep, 5 weeks operation). Establish basic guardrails: approved feedstocks only, contamination prevention, and student handling procedures.
Install Standardized Vermicomposting Garden Kit
Assemble the worm system using standardized bedding media and calibrated worm quantities. Verify moisture level, airflow, and drainage controls. Post a feedstock acceptance list and contamination rules at the bin. Create a labeled scrap collection container. Run a 3 to 5 day stabilization period before full student feeding. Document baseline conditions (location, setup date, initial bedding volume, worm quantity).
Train Educator and Launch Student Operating Routine
Deliver onboarding covering decomposition biology, carbon-to-nitrogen balance, moisture management, aeration, odor control, pest prevention, and safety protocols. Assign student roles (feed manager, moisture checker, data recorder, contamination monitor). Establish a weekly routine: measure inputs, add bedding as needed, mix lightly, check moisture, log observations. Use short checklists to keep workload predictable.
Implement Curriculum and Data Collection
Integrate lessons into instruction using observation, hypothesis testing, and systems mapping. Students record scrap weights, estimate diversion, and track bin performance indicators (moisture, smell, worm activity, decomposition rate). Use consistent logs and simple rubrics. Troubleshoot using defined decision rules (too wet: add bedding, increase airflow; too dry: mist; odor: reduce inputs, increase carbon).
Expand to Additional Classrooms and Standardize Schoolwide Practice
Once the pilot is stable, replicate with identical kits, training, and routines in additional grades or classrooms. Centralize tracking into one school log. Standardize signage, feedstock rules, and student roles across classrooms. Use periodic check-ins to reduce drift in operating quality. Aim for consistency before adding cafeteria-level components.
Complete Food Waste Audit
Conduct a baseline cafeteria waste audit to quantify organic fractions and contamination rates. Use tools to measure weight and volume of landfill-bound organics and edible food waste. Establish a baseline week, then repeat after interventions. Summarize findings into actionable categories: prevention, recovery, composting. Use results to set numeric targets and justify next steps.
Install Share Tables, Food Rescue, and Build Budget Case for Compost Services
Implement share tables with clear rules, monitoring, and food safety alignment. Formalize food rescue pathways where allowable. Track edible recovery and reduced landfill tonnage. Translate reduced disposal into estimated hauling savings. Use savings plus audit data to create a recurring budget line for compost hauling or expanded decentralized systems, ensuring affordability and long-term accessibility.

Spread of the innovation

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