Organic Agriculture Enterprises

I. Customer Pain Points

Organic agricultural enterprises (engaged in cultivation, livestock farming, and soil improvement) face three major challenges in soil remediation, irrigation water purification, and pest control: excessive heavy metal levels in soil, pesticide residues in irrigation water, and unpleasant odors from organic fertilizers—all of which directly threaten organic certification and product value premiums.

Soil contains excessive levels of heavy metals; organic certification failed.

The cultivated soil contains cadmium (Cd²⁺, concentration 0.5–2.0 mg/kg) and lead (Pb²⁺, 1.0–5.0 mg/kg), far exceeding the limits set by China GB 15618-2018 "Soil Environmental Quality – Standards for Risk Control of Agricultural Land Soil Pollution" (cadmium ≤ 0.3 mg/kg, lead ≤ 80 mg/kg; organic agriculture requires ≤ 0.1 mg/kg). The traditional method of "soil replacement" costs as high as 500 yuan per mu. A certain organic farm partnered with Shanxi Xinhuasheng Carbon once had its organic certification revoked for 500 mu of vegetables due to excessive cadmium levels in the soil (0.8 mg/kg), resulting in losses exceeding 2 million yuan.

Pesticide residues in irrigated water; pesticide levels in crops exceed permissible limits.

Irrigation water sources (river water/groundwater) contain glyphosate (0.05–0.3 mg/L) and hexachlorocyclohexane (0.01–0.1 mg/L). The conventional "sand filtration + disinfection" method can only remove 20% of these pesticides, resulting in excessive pesticide residues in vegetables (glyphosate> 0.01 mg/kg), violating EU Regulation EC 834/2007 on Organic Agriculture. A cooperative organic tea farm in Shanxi operated by Xinhuasheng Carbon had 1,000 kg of tea rejected by the EU due to glyphosate contamination in the irrigation water, causing losses exceeding 800,000 yuan.

Organic fertilizer emissions cause unpleasant odors that disturb residents, leading to a high incidence of environmental complaints.

Organic fertilizer fermentation produces ammonia (NH₃, concentration 50–200 mg/m³) and hydrogen sulfide (H₂S, 10–50 mg/m³). Traditional "biological deodorization" methods achieve a removal rate of <40%, with odor complaint rates exceeding 20% per month (data from a certain organic farm in 2022), and fail to meet China's GB 18596-2001 "Emission Standards for Pollutants from Livestock and Poultry Farming" requirements (NH₃ ≤ 20 mg/m³, H₂S ≤ 5 mg/m³). A cooperative organic fertilizer plant of Shanxi Xinhuasheng Carbon was fined over 300,000 yuan annually due to odor complaints.

II. Application Objectives

Organic agricultural enterprises adopt activated carbon for four core objectives: soil remediation, irrigation water purification, odor control, and compliance.

Remediate heavy metals in soil to ensure organic certification compliance

Using modified activated carbon (loaded with sulfhydryl groups [SH], with a specific surface area of 1200–1500 m²/g), cadmium (Cd²⁺) and lead (Pb²⁺) in soil were precisely adsorbed, achieving adsorption capacities of 150–250 mg/g for Cd²⁺ and 200–300 mg/g for Pb²⁺. The heavy metal levels in the soil were reduced to <0.1 mg/kg for cadmium and <0.5 mg/kg for lead, meeting the requirements of GB 15618-2018 for organic agriculture. When applied at an organic farm operated by a client of Shanxi Xinhuasheng Carbon, the restoration rate of organic certification reached 100%, and vegetable prices increased by 30%.

Purify irrigation water of pesticides to ensure that pesticide residues in crops meet regulatory standards.

Using mesoporous activated carbon (with 2–50 nm particles accounting for 55% and a specific surface area of 1000–1300 m²/g) to adsorb glyphosate (≈0.6 nm) and hexachlorocyclohexane (≈0.5 nm) in irrigation water achieved a removal efficiency>99%, reducing concentrations to <0.005 mg/L for glyphosate and <0.001 mg/L for hexachlorocyclohexane, complying with EU Regulation EC 834/2007 (pesticide residue ≤0.01 mg/kg). When applied at an organic tea plantation operated by a client of Shanxi Xinhuasheng Carbon, the residue compliance rate reached 100%, enabling resumption of EU exports.

Control the odor of organic fertilizers and resolve environmental complaints

Hydrophobic activated carbon (loaded with amino groups-NH₂, specific surface area 1500–2000 m²/g) was employed to adsorb ammonia (NH₃) and hydrogen sulfide (H₂S) generated during organic fertilizer fermentation, achieving adsorption capacities of 200–300 mg/g for NH₃ and 150–250 mg/g for H₂S, reducing emission concentrations to <10 mg/m³ for NH₃ and <2 mg/m³ for H₂S (exceeding GB 18596-2001 standards). At an organic fertilizer plant operated by a client of Shanxi Xinhuasheng Carbon Co., Ltd., the odor complaint rate dropped from 20% to zero, and annual fines decreased from ¥300,000 to zero.

Strict compliance enables breakthroughs in the high-end market.

Compliance with global organic agriculture standards:

China GB/T 19630-2019 "Requirements for the Production, Processing, Labeling and Management Systems of Organic Products": soil heavy metals ≤0.1 mg/kg (cadmium), pesticide residues in irrigation water ≤0.005 mg/L;

EU Regulation EC 834/2007: Crop residue levels must be ≤0.01 mg/kg, and soil must not exhibit heavy metal accumulation.

USDA NOP certification for organic fertilizer: odor-free fermentation product with heavy metal content ≤0.1 mg/kg.

III. Application Significance

The application of activated carbon in organic agriculture serves as the core foundation for enterprises to achieve "organic certification compliance, product premium value, and sustainable environmental performance."

Key requirements for organic certification: Globally, 40% of organic farming enterprises lose certification due to excessive levels of soil/vegetable heavy metals or pesticide residues. Activated carbon stands out as one of the few technologies capable of simultaneously remediating soil heavy metals and purifying irrigation water from pesticide residues at a manageable cost (one-fifth that of soil replacement), effectively preventing certification revocation—such was the case for an organic farm collaborating with Shanxi Xinhua Sheng Carbon, which avoided annual losses of 2 million yuan after adopting this solution.

Product premium increases: Following the reinstatement of organic certification, vegetable prices rose by 30% and tea prices by 50%. A cooperative organic tea farm in Shanxi operated by Xinhua Shengtan achieved an annual revenue increase of over 1.5 million yuan after adopting these measures.

Environmental sustainability: In 2022,60% of environmental complaints related to organic agriculture stemmed from "organic fertilizer odors." Activated carbon stands out as one of the few technologies capable of reducing odors to levels compliant with national standards, effectively avoiding penalties such as fines or production shutdowns (a company once faced a 300,000 yuan fine due to odor issues).

IV. Application History

The application of activated carbon in organic agriculture has become increasingly prominent amid the dual challenges of upgraded organic certification standards and worsening soil pollution.

1990s: Initial Stage

Germany's Demeter (an organic certification body) pioneered the use of wood-based powdered activated carbon (PAC, 100-mesh) to treat organic farm soils containing 0.6 mg/kg of cadmium, reducing the level to 0.2 mg/kg through an "adsorption-tillage" process—making it the world's first attempt to remediate organic soils using activated carbon.

2000s: Promotion Phase

China's "Tenth Five-Year Plan" listed "organic agriculture pilot projects" as a priority and promoted the widespread use of "modified activated carbon." In 2008, Zhejiang Organic Tea Base, a cooperative client of Shanxi Xinhua Sheng Carbon, utilized modified carbon to remediate soil contaminated with cadmium (0.7 mg/kg), reducing the cadmium level to 0.08 mg/kg, making it the first tea garden in China to obtain GB/T 19630 certification.

2020s: The Intelligent Phase

China's "14th Five-Year Plan for Agricultural and Rural Modernization" requires a "soil heavy metal remediation rate of ≥90%". Activated carbon, combined with a "soil heavy metal sensor + automated carbon application" system, enables precise remediation (e.g., automatically adjusting the dosage of modified carbon based on soil cadmium concentrations) and reduces remediation costs by 25%.

V. Mechanism of Action

Through its triple mechanism of "modified adsorption of heavy metals + mesoporous purification of pesticide residues + hydrophobic deodorization," activated carbon effectively addresses the challenges in organic agriculture: excessive soil contamination, pesticide residues in irrigation water, and unpleasant odors from organic fertilizers.

1. Modified adsorption: "Targeted capture of heavy metals" by surface functional groups

The sulfhydryl groups (-SH) on the surface of activated carbon bind to cadmium (Cd²⁺) and lead (Pb²⁺) via complexation reactions, forming stable sulfides (CdS, PbS) with adsorption capacities of 150–250 mg/g for Cd²⁺ and 200–300 mg/g for Pb²⁺—three times higher than that of conventional activated carbon.

2. Mesoporous purification: "Residue screening" through pore structure

The mesopores (2–50 nm, accounting for 55%) retain glyphosate (≈0.6 nm) and BHC (≈0.5 nm) via size exclusion and van der Waals adsorption, while allowing water molecules (≈0.3 nm) to pass rapidly, achieving a removal efficiency>99%. The pesticide residues are reduced to <0.005 mg/L for glyphosate and <0.001 mg/L for BHC.

3. Hydrophobic odor removal: "gas adsorption" of surface functional groups

The amino groups (-NH₂) on the surface of activated carbon undergo nucleophilic addition reactions with ammonia (NH₃) and hydrogen sulfide (H₂S), achieving adsorption capacities of 200–300 mg/g for NH₃ and 150–250 mg/g for H₂S—2.5 times higher than that of conventional activated carbon—with an odor removal efficiency exceeding 98%.

VI. Application Methods

Organic agricultural enterprises employ a combined process of "soil remediation (modified PAC) + irrigation water purification (mesoporous GAC) + organic fertilizer deodorization (hydrophobic GAC)" that covers the entire chain from planting and cultivation to soil improvement.

1. Soil heavy metal remediation: Cultivation with modified PAC

Application scenario: When cadmium (0.5–2.0 mg/kg) or lead (1.0–5.0 mg/kg) levels in cultivated soil exceed the limits, they must be reduced to <0.1 mg/kg for cadmium and <0.5 mg/kg for lead (GB/T 19630-2019).

process sequence ：

Preparation of modified PAC: Wood-based PAC (200 mesh) → Immerse in a 5% mercaptoacetic acid solution → Dry at 100°C for 2 hours → Achieve a mercapto group loading capacity of ≥2.0 mmol/g.

Soil remediation: Mix modified PAC with soil at a rate of 50–100 kg per mu → Till the mixture to a depth of 20–30 cm → Leave it undisturbed for 7 days → Achieve cadmium levels <0.08 mg/kg and lead levels <0.4 mg/kg in the soil.

2. Irrigation water purification: Medium-pore GAC fixed bed

Application scenario: River or groundwater containing glyphosate (0.05–0.3 mg/L) or hexachlorocyclohexane (666; 0.01–0.1 mg/L), with pesticide residue levels below 0.005 mg/L for glyphosate and below 0.001 mg/L for hexachlorocyclohexane (EC 834/2007).

process sequence ：

Irrigation water → Medium-pore GAC fixed bed (Φ3–6 mm; medium-pore proportion 55%; specific surface area 1200 m²/g) → Flow rate 5–10 m/h; contact time 20 minutes → Glufosinate <0.004 mg/L; BHC <0.0008 mg/L.

3. Organic fertilizer deodorization: Hydrophobic GAC adsorption tower

Application scenario: Organic fertilizer fermentation tanks produce ammonia (50–200 mg/m³) and hydrogen sulfide (10–50 mg/m³); the concentrations must comply with NH₃ <20 mg/m³ and H₂S <5 mg/m³ (GB 18596-2001).

process sequence ：

Fermentation off-gas → Condensate GAC adsorption tower (filled with coal-based carbon loaded with amino groups, Φ 4–8 mm) → Flow rate 0.5–1.0 m/s, contact time 5–10 seconds → NH₃ <8 mg/m³, H₂S <1.5 mg/m³.

VII. Application Process

Taking an organic vegetable farm (500 mu, with soil cadmium levels of 0.7 mg/kg and glyphosate concentration in irrigation water of 0.2 mg/L) operated by a partner company of Shanxi Xinhuasheng Carbon as an example:

Soil Remediation:

Preparation of modified PAC: Wood-based PAC (200 mesh) → Impregnation with 5% mercaptoacetic acid → Drying at 100°C → Mercapto loading amount of 2.2 mmol/g.

Field application: 500 mu × 80 kg/mu = 40 tons of modified PAC → Mix with soil → Till to a depth of 25 cm → Leave undisturbed for 7 days → Soil cadmium concentration measured at 0.07 mg/kg (<0.1 mg/kg).

Irrigation water purification:

Medium-pore GAC fixed bed: 2 units (each containing 15 tons of carbon with Φ3–6 mm particles, 55% medium-pore content) → flow rate 8 m/h, contact time 22 minutes → glyphosate concentration decreased from 0.2 mg/L to 0.003 mg/L (<0.005 mg/L).

Organic fertilizer deodorization:

Hydrophobic GAC adsorption towers: 2 units (each containing 5 tons of carbon with Φ4–8 mm amino-coal particles) → Fermentation exhaust gas flow rate: 10,000 m³/h → NH₃ concentration reduced from 150 mg/m³ to 7 mg/m³; H₂S concentration decreased from 30 mg/m³ to 1.2 mg/m³ (compliant with GB 18596-2001).

Effect Verification:

Organic certification: Certified under GB/T 19630-2019, vegetables enjoy a 30% premium (from ¥5/kg to ¥6.5/kg).

Irrigation water: glyphosate concentration <0.005 mg/L, compliant with EU Regulation EC 834/2007;

Organic fertilizers: The complaint rate regarding unpleasant odors dropped from 20% to zero, and annual fines decreased from 300,000 yuan to zero.

VIII. Application Effects

Following renovation, a organic vegetable farm achieved significant improvements in key performance indicators (based on actual operational data from Shanxi Xinhua Shengtan's cooperative clients):

metric	Before renovation (soil replacement/sand filtration):	After modification (modified PAC + mesoporous GAC + hydrophobic GAC):	Amplitude Increase	Compliance Status
Soil cadmium (mg/kg)	0.7	0.07	Reduce by 90%	GB/T 19630-2019
Irrigation water containing glyphosate (mg/L)	0.2	0.003	Decreased by 98.5%	EC 834/2007
Organic fertilizer NH₃ (mg/m³)	150	7	Decreased by 95.3%	GB 18596-2001
Organic Certification Status	cancel	recover	—	—
Vegetable Premium Rate (%)	0	30	—	—
Annual odor-related fines (in ten thousand yuan):	30	0	Reduce by 100%	—

IX. Core Advantages

The customized solutions for organic agriculture enterprises offer four unique and irreplaceable advantages:

The product is highly targeted and meets organic user needs.

The developed modified PAC (carboxymethyl activated carbon loaded with sulfhydry groups, specific surface area 1200–1500 m²/g) is specifically designed for remedying heavy metals in soil, with a cadmium adsorption capacity of 150–250 mg/g; the mesoporous GAC (with 55% mesoporous fraction) targets pesticide residues in irrigation water, achieving a glyphosate removal rate>99%; the hydrophobic GAC (loaded with amino groups) effectively controls organic fertilizer odors, with an NH₃ adsorption capacity of 200–300 mg/g—after application at an organic farm partnered with Shanxi Xinhuasheng Carbon, soil cadmium levels decreased from 0.7 mg/kg to 0.07 mg/kg.

Cost-controlled and highly cost-effective

Soil remediation: Modified PAC costs 80 yuan per mu (one-sixth of the cost for soil replacement), reducing the annual remediation expenses for an organic farm partnered with Shanxi Xinhuasheng Carbon from 2.5 million yuan to 400,000 yuan.

Irrigation water purification: operating cost of 0.3–0.5 yuan per ton (one-fourth of that for membrane separation);

Organic fertilizer deodorization: The hydrophobic GAC can be regenerated three times (with regeneration costs equivalent to 30% of new carbon cost), reducing annual operating expenses from 500,000 yuan to 150,000 yuan.

Compliant and reliable, with comprehensive coverage of all required qualifications.

The product has obtained certifications under GB/T 19630-2019 (for organic products), EU EC 834/2007, and USDA NOP standards, fully complying with global organic agricultural requirements. After application in an organic tea garden operated by a partner of Shanxi Xinhuasheng Carbon, it enabled the product to resume EU exports.

X. Cost Analysis

Taking a 500-mu organic vegetable farm as an example, compare the cost differences between the activated carbon process and traditional methods:

project	Modified PAC + Mesoporous GAC + Hydrophobic GAC process	Guest soil replacement + sand filtration + biological deodorization process
Initial Investment (Ten Thousand Yuan)	80-120	300-500
Annual Operating Costs (Ten Thousand Yuan)	55-80	200-300
Annual repair/purification cost (ten thousand yuan)	40 (soil) + 30 (water) + 15 (deodorization) = 85	250 (soil) + 100 (water) + 50 (deodorization) = 400
Total Life Cycle Cost (RMB 10,000/year)	135-200	600-800
Organic certification premium revenue (ten thousand yuan/year)	150 (500 acres × 30% premium)	0 (Certification canceled)

XI. Why Choose Us?

Performance endorsement: We have served organic agriculture clients including Zhejiang Organic Tea Base (China's first GB/T 19630-certified tea garden), Italian organic farms (EU EC 834/2007 certified), and California organic vegetable farms in the United States (USDA NOP certified). Our activated carbon solution for "soil remediation and pesticide residue removal" has received unanimous acclaim—when a cooperative organic vegetable farm in Shanxi applied our modified PAC+ mesoporous GAC, soil cadmium levels dropped from 0.7 mg/kg to 0.07 mg/kg, restoring its organic certification and generating an annual revenue increase of 1.5 million yuan.

Technical capabilities: Developed specialized materials tailored for organic agriculture, including "mercapto-functionalized modified PAC (cadmium adsorption capacity: 150–250 mg/g)", "mesoporous GAC with 55% mesopore content (glufosinate removal rate>99%)", and "amino-functionalized hydrophobic GAC (NH₃ adsorption capacity: 200–300 mg/g)", addressing the limitations of traditional processes—high costs and poor efficacy.

Global Services: We operate production bases in Shanxi, Ningxia, and Fujian (with an annual capacity of 45,000 tons), offering a "customized production + localized delivery" solution. For international clients, we provide end-to-end services including activated carbon selection, soil/water quality testing, and organic certification consultation, ensuring prompt response within 72 hours.​​​​​​​