Rice
+20% average yield
Reported paddy trials showed average yield increases around 20% (peak 23.4%) and grain protein content up to 27% higher.
Integrated biomass · biochar · carbon removal
From biomass residues to verified carbon removal.
Tongao Group integrates biomass collection, preprocessing, carbonisation, clean-energy recovery, biochar products, soil improvement, low-carbon agriculture, and international carbon-project development within a single operating platform — engineered to be scaled, financed, and verified.
Group at a glance
15
Affiliated group companies
200,000+
Tonnes of biomass processed annually
8
Biomass preprocessing facilities in Zhejiang
2
Internationally certified carbon-removal projects
918
tCO₂ removed — first Puro.earth issuance
4th
company in Asia certified by Puro.earth (2025)
Integrated value chain
One operating platform — from biomass residues to carbon-credit sales.
Step through the chain — every stage is operated or coordinated by Tongao.
Biomass sourcing
Agricultural, forestry, bamboo and landscaping residues aggregated across regional collection networks.
Business platform
Eight business units, one integrated group.
Each unit is a working operating company — not a diagram. Together they close the loop from feedstock to verified carbon-removal and low-carbon food.
Biomass Collection & Preprocessing
Collection and treatment of agricultural, forestry and landscaping residues at regional scale.
Biomass Valorisation
Conversion into fertilisers, fuels, feed products, growing substrates and biochar materials.
Biochar & Soil Solutions
Biochar-based fertilisers, growing substrates and crop-specific soil-improvement programmes.
Carbon Removal
Project design, dMRV, validation, issuance and carbon-credit commercialisation.
Equipment & Clean Energy
Centralised and distributed carbonisation equipment, hot-air, hot-water, steam and drying systems.
Circular Agriculture
Biochar-enabled agricultural production, soil restoration and low-carbon products.
Food Supply Chain
Food processing, agricultural sourcing, cold-chain logistics and institutional distribution.
Integrated Project Development (AOD)
EPC + O delivery of full-value-chain biomass and agricultural projects for governments, industrial parks and investors.
Carbon removal · Tongao Greenchar
Carbon-removal projects that are physically real, agriculturally productive, and independently verified.
Tongao Greenchar — our joint venture with GreenChar Climate Solutions — builds international carbon-removal projects on Tongao Group's physical biomass and agricultural network, covering development, digital MRV, certification and offtake.
Project development lifecycle
- 01Feedstock assessment
- 02Feasibility study
- 03Business-model design
- 04Technology & equipment selection
- 05Project documentation
- 06Baseline & additionality
- 07Facility commissioning
- 08Operational monitoring
- 09Digital MRV
- 10Validation & verification
- 11Credit issuance
- 12Carbon-credit sales & offtake
Proven agricultural applications
Biochar performance across rice, grapes, tea and vegetables.
Results from specific Tongao-supported field applications. Outcomes vary by soil, crop, climate, biochar characteristics and application rate. Field-level methodology and reports available on request.
Grapes
+27.6% sugar content
At 200 kg biochar/mu, average cluster weight reached 789 g and sugar content averaged 18.56° (peak 21°).
Tea
+41% bud weight
Hundred-bud weight increased by 41.11%; one-bud-one-leaf ratio improved to 81.8%.
Vegetables & substrates
Better water & nutrient retention
Biochar-blended substrates improved water and nutrient retention and reduced soil bulk density.
Products & services
What you can buy from Tongao.
From fertiliser formulations and biochar to carbonisation equipment and certified carbon-removal projects.
Operating footprint
Eight preprocessing plants, two biochar sites, one fertiliser plant — all real, all in Zhejiang.
Zhejiang Province · site locations
Xiuzhou, Jiaxing
Xiuzhou Tongao Biochar Project
Preprocessing + China's first CSI-certified biochar carbon-removal project
NE of Yangxi Village committee, Xiuzhou District, Jiaxing, Zhejiang
Impact estimator
How much carbon is sitting in your residue pile?
Set the annual residue volume you can supply and see the indicative biochar, carbon-removal, heat and soil outcomes Tongao's process would deliver.
Annual residue supply20,000 t
Biochar produced
5,600
t / year
Durable carbon removal
14,000
tCO₂e / year
Recoverable heat
18,000
MWh / year
Farmland amended
1,120
hectares
Discuss a project with us
Indicative only. Actual yields depend on moisture, feedstock quality, plant configuration and the certification methodology applied.
Latest from the field
All news & updatesNews, visits and certifications.
Track record
Ten years from residue collection to internationally certified carbon removal.
2016
Group founded in Zhejiang
Zhejiang Tongao Environmental Technology begins collecting and valorising agricultural and forestry residue.
2019
First preprocessing plants
Regional sorting, drying and sizing plants come online across northern Zhejiang.
2022
Carbonisation & clean energy
In-house carbonisation equipment and heat recovery close the energy loop at the biochar sites.
2025
Puro.earth certification
Jiaxing biochar project certified — Asia's 4th company on Puro.earth; first issuance of 918 tCO₂.
2026
China's first CSI-certified project
Xiuzhou Tongao becomes China's first CSI-certified biochar carbon-removal project, registered on the Global C-Sink Registry.
2026
Eight plants · Tongao Greenchar
Eight preprocessing plants operating; all new carbon-removal projects developed through Tongao Greenchar.
From our sites
Plants, kilns, fields and the people who visit them.
Drag or swipe to explore
Partners & institutions
Certification registries, research institutions, and Tongao's operating group.
One consolidated roster: the registries that certify our carbon removal, the institutes behind our field science, and the operating companies inside Tongao Group.
Certification body03
Research institution07
Build the next generation of climate infrastructure
Verified carbon removal, built on real physical infrastructure.
Tongao works with governments, investors, carbon buyers, agricultural organisations and industrial partners to develop commercially viable biomass-valorisation and carbon-removal projects.
Zhejiang Tongao Environmental Technology Co., Ltd.