米国中小酪農におけるメタン削減戦略としてのふん尿貯留施設の被覆・フレアリング
Covering and Flaring Manure Storage Units as a Methane Mitigation Strategy for Small- to Midsize Dairy Operations in the United States (原題)
Reza Keshavarz Afshar, Jim Wallace, April B. Leytem, Tim Kurt
🤖 gxceed AI 要約
日本語
米国の1,000頭未満の中小酪農8,675農場を対象に、ふん尿貯留施設の被覆・フレアリング（cap-and-flare）によるメタン削減ポテンシャルをIPCC Tier 2モデルで推計。全面導入時の削減量は553万〜1,036万t-CO2e/年で、2022年EPAインベントリの酪農ふん尿由来メタンの16〜30%に相当する。平均削減コスト（LCOM）は29〜55ドル/t-CO2eで費用効率的な選択肢となり得る。既存のUSDA-NRCS慣行基準367が活用可能だが、本格普及には専用資金と技術支援が必要と論じる。
English
Using an IPCC Tier 2 model across 8,675 US dairies under 1,000 cows, the authors estimate that full cap-and-flare adoption on manure storages could mitigate 5.53–10.36 MMT CO2e/yr, equal to 16–30% of dairy manure CH4 in the 2022 EPA inventory. Average levelized cost of mitigation is $29–55/t CO2e, making it cost-efficient. Existing USDA-NRCS Conservation Practice Standard 367 offers an incentive mechanism, though scale-up needs dedicated funding and technical assistance.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の酪農・畜産分野でもメタン対策はGX推進の論点であり、中小規模事業者向けの低コスト削減技術と補助制度の設計はJ-クレジットや農業由来排出削減の議論に示唆を与える。大規模ADが難しい事業セグメントへの政策的支援の在り方を考える材料となる。
In the global GX context
Adds empirical evidence on a neglected mitigation pathway for the small/mid-size livestock segment, relevant to global methane pledges (Global Methane Pledge) and to how agricultural non-CO2 emissions are treated in inventories and incentive schemes. It complements AD-centric transition finance and policy design discussions.
👥 読者別の含意
🔬研究者:Provides a transparent Tier 2 estimation of technical potential and LCOM for a non-AD manure mitigation option, useful for comparing agricultural methane abatement cost curves.
🏢実務担当者:Dairy operators and agri-food sustainability teams can assess cap-and-flare as a lower-cost alternative where AD is not viable, and check eligibility under NRCS CPS 367.
🏛政策担当者:Suggests that dedicated infrastructure funding and technical assistance, building on existing conservation standards, could unlock meaningful methane reductions from smaller farms.
📄 Abstract（原文）
Covering manure storages and flaring the captured methane (cap-and-flare) offers a technically feasible mitigation pathway for small- and midsize dairies that has received limited attention relative to anaerobic digestion (AD). While AD systems are more economically feasible for large operations, the dairy segment with fewer than 1,000 cows still produces approximately 34% of U.S. milk and remains largely unaddressed. We estimated technical CH4 mitigation potential under full cap-and-flare adoption using the IPCC Tier 2 model for 8,675 dairy farms across 38 US states. Under 100% adoption, liquid storage CH4 mitigation potential (GWP100 = 27) ranged from 5.53 MMT CO2e yr-1 (central 90% interval: 3.70-6.63) to 10.36 (central 90% interval: 6.93-12.42) depending on the Arrhenius activation energy and reference temperature constants applied, representing 16-30% of the CO2e attributed to dairy manure CH4 in the 2022 EPA Greenhouse Gas Inventory. These values represent an upper-bound technical potential rather than a projected deployment level. Average national Levelized Costs of Mitigation (LCOM) ranged from \$55 t-1 CO2e (conservative parametrization) to \$29 t-1 CO2e (upper-bound parametrization), positioning cap-and-flare as a cost-efficient CH4 mitigation option. Existing USDA-NRCS Conservation Practice Standard 367 provides an available incentive mechanism, although meaningful scale-up will likely require dedicated funding for infrastructure and technical assistance. These results suggest that cap-and-flare could complement AD as a mitigation pathway for U.S. dairy operations where AD is not economically viable.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.est.6c08139first seen 2026-10-31 04:45:45 · last seen 2026-11-06 04:35:34
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