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.
Scroll
Group at a glance
15
Affiliated group companies
200,000+
Tonnes of biomass processed annually
8
Biomass preprocessing facilities in Zhejiang
- Residues
- Carbonisation
- Biochar
- Verified removal
- Low-carbon crops
From our sites
Plants, kilns, fields and the people who visit them.
Drag or swipe to explore
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
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.
Proven in the field
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.
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.
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.
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.