Ecological Restoration Companies

I. Customer Pain Points

Ecological restoration companies (specializing in mine remediation, wetland management, and soil improvement) face three major challenges in treating contaminated media, reconstructing ecosystems, and ensuring long-term stability: the difficulty in completely eliminating heavy metal pollution, persistent organic pollutant residues, and susceptibility to ecological degradation post-restoration—all of which directly threaten restoration efficacy and project approval.

Heavy metal pollution is difficult to eradicate completely, with high risks of secondary contamination.

The soil at mine tailings/smelting sites contains lead (Pb²⁺, 500–2000 mg/kg), cadmium (Cd²⁺, 5–50 mg/kg), and arsenic (As³⁺, 50–300 mg/kg). Traditional "soil covering" methods can only isolate pollutants but cannot degrade them; after 3–5 years, heavy metal leakage occurs due to rainwater erosion (concentration>1.0 mg/L, exceeding China GB 15618-2018 "Soil Environmental Quality – Risk Control Standards for Soil Pollution on Construction Sites"). A mine remediation company collaborating with Shanxi Xinhuasheng Carbon was penalized by the Ministry of Ecology and Environment for lead leakage post-remediation (1.2 mg/L), resulting in project failure and losses exceeding 3 million yuan.

Residual organic pollutants and disruption of the ecological chain

Soil and groundwater at industrial waste sites contain polycyclic aromatic hydrocarbons (PAHs, 10–100 mg/kg) and petroleum hydrocarbons (C₆–C₁₂, 100–500 mg/kg). Conventional microbial degradation methods can only remove 40% of the organic matter, resulting in PAH residue levels exceeding 1.0 mg/kg in the treated soil—a value surpassing EU Directive 2018/841 on Soil Remediation. In a wetland remediation project undertaken by Shanxi Xinhuasheng Carbon for a client, PAH residues caused aquatic organism mortality, leading to rework costs exceeding 1.5 million yuan.

The restored ecosystem is prone to degradation and exhibits poor long-term stability.

After restoration, the soil organic matter content was <1.0% and microbial diversity <50% (<China's "Technical Guidelines for Evaluating Ecological Protection and Restoration Outcomes" requires organic matter ≥1.5% and diversity ≥70%). Traditional "organic fertilizer application" could only provide short-term improvement, with organic matter levels dropping back to <1.0% within one year. In a degraded grassland restoration project undertaken by Shanxi Xinhua Shengtan in collaboration with clients, vegetation coverage decreased from 60% to 30% after three years due to ecological degradation, necessitating secondary restoration at a cost exceeding 2 million yuan.

II. Application Objectives

The four core objectives of ecological restoration companies using activated carbon are: complete removal of heavy metals, degradation of organic compounds, long-term ecological stability, and compliance verification.

Radically eliminate heavy metal pollution and eradicate secondary pollution

Using long-term modified activated carbon (loaded with sulfides-S²⁻, specific surface area 1200–1500 m²/g), stable sulfide precipitates (PbS, CdS, As₂S₃) are formed with heavy metals, achieving adsorption capacities of 200–300 mg/g for Pb²⁺, 150–250 mg/g for Cd²⁺, and 250–350 mg/g for As³⁺. This process reduces the available forms of heavy metals in soil to <50 mg/kg for lead, <0.5 mg/kg for cadmium, and <10 mg/kg for arsenic (compliant with GB 15618-2018), with no leakage observed over a 10-year period (the remediation project at a mine operated by Shanxi Xinhuasheng Carbon Cooperative achieved a 100% acceptance rate).

Degrades organic pollutants and reconstructs the ecological chain

Using mesoporous activated carbon (with 2–50 nm particles accounting for 55% of the total, and a specific surface area of 1000–1300 m²/g) to adsorb PAHs (≈0.6–1.0 nm) and petroleum hydrocarbons (≈0.5–1.0 nm), while serving as a microbial carrier to promote degradation bacteria proliferation (with biofilm attachment increasing threefold) and achieving an organic matter removal rate>99% (PAHs <0.1 mg/kg, petroleum hydrocarbons <10 mg/kg, compliant with EU 2018/841). Following application in a wetland restoration project by a client of Shanxi Xinhuasheng Carbon, the survival rate of aquatic organisms increased from 40% to 90%.

Ensure long-term ecological stability and reduce secondary restoration costs.

Using biochar-based activated carbon (organic content ≥30%, specific surface area 800–1200 m²/g) enhances soil organic matter (≥1.5%) and microbial diversity (≥75%), while slowly releasing nutrients (nitrogen, phosphorus, potassium). Within five years post-restoration, organic matter levels remained at ≥1.2%. In a degraded grassland project undertaken by a client of Shanxi Xinhuasheng Carbon Cooperation, vegetation coverage stabilized above 60% after application, eliminating the need for secondary restoration.

Strict compliance ensures project acceptance.

Meet global ecological restoration standards:

China GB 15618-2018: Effective states of heavy metals: lead <50 mg/kg, cadmium <0.5 mg/kg;

EU Regulation 2018/841: Soil levels of PAHs shall be <1.0 mg/kg, and petroleum hydrocarbons shall be <50 mg/kg;

U.S. EPA Superfund Remediation Standards: Heavy metal leaching <0.1 mg/L; organic matter <1.0 mg/kg.

III. Application Significance

The application of activated carbon in ecological restoration serves as the core foundation for enterprises to achieve "minimum restoration efficacy, project acceptance, and long-term benefits."

Key Considerations for Restoration Effectiveness: Globally, 50% of ecological restoration projects fail inspection due to "heavy metal leakage or organic residue contamination." Activated carbon stands out as one of the few technologies capable of simultaneously eliminating heavy metals, degrading organic compounds, ensuring long-term stability, and maintaining cost-effectiveness (at just one-fourth the cost of chemical leaching), thereby directly preventing inspection failures—such as when a mine restoration company collaborating with Shanxi Xinhua Shengtan achieved annual loss savings of 3 million yuan after application.

Project acceptance assurance: Post-restoration, both the available forms of heavy metals and organic residue levels fully comply with standards. A wetland restoration project implemented by Shanxi Xinhuasheng Carbon in collaboration with clients successfully passed EU Regulation (EU) 2018/841 acceptance criteria and received funding support from the EU Ecological Restoration Fund (€500,000).

The long-term benefits are significant: ecological stability has improved, and the cost of secondary restoration has been reduced from 2 million yuan to zero. A degraded grassland project managed by a partner company of Shanxi Xinhuasheng Carbon saved 2 million yuan annually, equivalent to increasing the project's profit margin by 15 percentage points.

IV. Application History

The application of activated carbon in ecological restoration has been progressively deepened alongside the implementation of the Soil Pollution Prevention and Control Law and the upgrading of ecological restoration standards.

2000s: Initial Stage

The Ruhr Region mine remediation project in Germany pioneered the use of granular activated carbon (GAC, Φ3–6 mm) to treat lead-contaminated soil (Pb²⁺: 800 mg/kg), reducing bioavailable lead levels to 100 mg/kg through an "adsorption-solidification" process, marking the world's first application of activated carbon for remediating heavy metal-contaminated soils.

2010s: Promotion Phase

After the implementation of China's Soil Pollution Prevention and Control Action Plan ("Soil Ten Measures") in 2016, the widespread adoption of "long-lasting modified activated carbon" was promoted. In 2018, a heavy metal-contaminated farmland remediation project in Hunan Province, carried out by Shanxi Xinhua Shengtan in collaboration with clients, utilized modified carbon loaded with sulfides, reducing cadmium levels from 25 mg/kg to 0.4 mg/kg, making it the first farmland remediation project in China to pass the GB 15618 certification.

V. Mechanism of Action

Through its triple mechanism of "long-lasting modified solid heavy metal immobilization + mesoporous bacterial colonization for organic matter removal + biochar-based ecological stabilization," activated carbon effectively addresses the challenges of ecological restoration posed by heavy metal leaching, organic residue accumulation, and ecosystem degradation.

1. Long-lasting modified solid heavy metals: "stable precipitation" of surface functional groups

The sulfide ions (-S²⁻) on the activated carbon surface react by precipitation with lead (Pb²⁺), cadmium (Cd²⁺), and arsenic (As³⁺) to form sulfides with extremely low solubility (PbS: Ksp = 9.04 × 10⁻²⁹; CdS: Ksp = 8.0 × 10⁻²⁷; As₂S₃: Ksp = 2.1 × 10⁻²²). The adsorption capacity reaches 200–350 mg/g—three times that of conventional activated carbon—and shows no leaching over a 10-year period (leaching <0.05 mg/L).

2. Mesoporous materials for bacterial loading and organic degradation: synergistic adsorption-degradation effect of pore structure

The mesopores (2–50 nm, accounting for 55%) retain polycyclic aromatic hydrocarbons (PAHs; ≈0.6–1.0 nm) and petroleum hydrocarbons (≈0.5–1.0 nm) through size exclusion and van der Waals adsorption, while also serving as a microbial carrier (with a specific surface area of 1000–1300 m²/g providing attachment sites). This enhances the proliferation of degradation bacteria (e.g., Pseudomonas), increases biofilm formation by threefold, and achieves an organic matter removal rate exceeding 99% (PAHs <0.1 mg/kg; petroleum hydrocarbons <10 mg/kg).

3. Biochar-based stable ecology: The "fertilizer retention-fertilizer supply" mechanism of pores and organic matter

Biochar-based activated carbon (with organic matter ≥30%) utilizes its micropores (<2 nm) to adsorb nitrogen, phosphorus, and potassium nutrients, thereby reducing nutrient loss; its mesopores (2–50 nm) serve as "nutrient transport channels" for slow release of these nutrients. This process maintains soil organic matter at ≥1.5%, microbial diversity at ≥75%, and organic matter levels at ≥1.2% for five years post-restoration.

VI. Application Methods

The ecological restoration company employs a combined process of "heavy metal remediation (long-term modified GAC), organic degradation (bacterial-loaded mesoporous GAC), and ecological stabilization (biochar-based PAC)" to address various scenarios including mines, wetlands, farmlands, and grasslands.

1. Heavy metal pollution remediation: Long-lasting modified GAC fixed bed

Application scenarios: For soil samples from mine tailings or smelting sites containing lead (500–2000 mg/kg), cadmium (5–50 mg/kg), and arsenic (50–300 mg/kg), the effective lead content must be <50 mg/kg, cadmium <0.5 mg/kg, and arsenic <10 mg/kg (GB 15618-2018).

process sequence ：

Preparation of long-term modified GAC: Coal-based GAC (Φ3–6 mm) → Immersed in 5% sodium sulfide solution → Dried at 100°C for 2 hours → Sulfide loading capacity ≥ 3.0 mmol/g.

Soil remediation: Mix modified GAC with contaminated soil at a rate of 100–200 kg per mu → till the mixture (to a depth of 30–50 cm) → leave it undisturbed for 15 days → achieve lead levels <45 mg/kg, cadmium <0.4 mg/kg, and arsenic <8 mg/kg.

2. Degradation of organic pollutants: Mesoporous GAC bacterial filter layer

Application scenarios: For soils or groundwater in industrial heritage sites containing polycyclic aromatic hydrocarbons (PAHs, 10–100 mg/kg) or petroleum hydrocarbons (100–500 mg/kg), the PAHs concentration should be <1.0 mg/kg and petroleum hydrocarbon concentration <50 mg/kg (EU 2018/841).

process sequence ：

Contaminated groundwater → Medium-sized pore GAC bacterial filter layer (厚度 50 cm, particle diameter Φ2–5 mm; medium-sized pores account for 55%) → Inoculation with degradation bacteria (Pseudomonas) → Flow rate 0.1–0.2 m/s → PAHs <0.08 mg/kg; petroleum hydrocarbons <8 mg/kg.

3. Ecological stability: Application of biochar-based PAC

Application scenarios: Degraded grassland/farmland soils with organic matter content <1.0% and microbial diversity <50%; requirements include organic matter ≥1.5% and diversity ≥70% (per the Technical Guidelines for Evaluation of Ecological Protection and Restoration Outcomes).

process sequence ：

Biochar-based PAC (200-mesh, organic matter ≥30%) → Apply at 80–120 kg per mu → Tumble soil to a depth of 25 cm → Leave undisturbed for 10 days → Ensure organic matter content ≥1.6%, microbial diversity ≥76%, and maintain ≥1.2% for five years.

VII. Application Process

Taking a mine remediation project by a partner company of Shanxi Xinhuasheng Carbon (covering 100 mu, with soil levels of 1200 mg/kg lead, 30 mg/kg cadmium, and 50 mg/kg PAHs) as an example:

Heavy Metal Restoration:

Long-term modified GAC: Coal-based GAC (Φ3–6 mm) → Impregnated with 5% sodium sulfide → Dried at 100°C → Sulfide loading capacity: 3.2 mmol/g.

Field application: 100 mu × 150 kg/mu = 15 tons of modified GAC → tillage to a depth of 40 cm → leave undisturbed for 15 days → soil levels: lead 42 mg/kg (<50 mg/kg), cadmium 0.35 mg/kg (<0.5 mg/kg), arsenic 7.5 mg/kg (<10 mg/kg).

organic matter degradation ：

Mesoporous GAC bacterial-loaded filter layer: 50 cm thick, with particle sizes ranging from Φ2 to Φ5 mm; mesoporous particles account for 55% of the total volume. After inoculation with Pseudomonas aeruginosa and under an underground water flow rate of 0.15 m/s, PAH levels decreased from 50 mg/kg to 0.07 mg/kg (<1.0 mg/kg), while petroleum hydrocarbons dropped from 200 mg/kg to 7.5 mg/kg (<50 mg/kg).

Ecological Stability:

Biochar-based PAC: 200-mesh particle size, 32% organic matter → Application rate: 100 kg per mu (100 acres) = 10 tons → Tilling depth: 25 cm → Incubation period: 10 days → Final results: 1.65% organic matter content and 77% microbial diversity; levels maintained at 1.3% after 5 years.

Effect Verification:

Project acceptance: Compliant with GB 15618-2018 and the Technical Guidelines for Evaluation of Ecological Protection and Restoration Outcomes, achieving a 100% acceptance rate.

Long-term stability: after 5 years, soil levels were 45 mg/kg for lead, 0.38 mg/kg for cadmium, and 1.3% for organic matter, with no need for secondary remediation.

Ecological restoration: Vegetation coverage increased from 20% to 65%, and biodiversity improved by 80%.

VIII. Application Effects

Following the renovation of a mine restoration project, key performance indicators showed significant improvement (based on actual operational data from Shanxi Xinhua Shengtan's partner clients):

metric	Before modification (soil coverage/microbial degradation)	After modification (long-lasting modified GAC + mesoporous GAC loaded with bacteria + biochar-based PAC):	Amplitude Increase	Compliance Status
Soil lead (mg/kg)	1200	42	Decreased by 96.5%	GB 15618-2018
Soil cadmium (mg/kg)	30	0.35	Decreased by 98.8%	GB 15618-2018
Soil PAHs (mg/kg)	50	0.07	Decreased by 99.86%	EU 2018/841
soil organic matter （%）	0.8	1.65	Increased by 106.25%	"Guidelines for Ecological Assessment"
Project Acceptance Rate (%)	0	100	—	—
Annual cost for secondary repairs (in ten thousand yuan):	200	0	Reduce by 100%	—

IX. Core Advantages

The customized solutions offered by ecological restoration companies possess four irreplaceable advantages:

The product is highly targeted and meets repair needs.

The developed long-lasting modified GAC (loaded with sulfides, specific surface area 1200–1500 m²/g) is specifically designed for heavy metal removal, achieving lead adsorption capacity of 200–300 mg/g; the mesoporous GAC loaded with bacteria (55% mesopores) targets organic matter degradation, removing over 99% of PAHs; while the biochar-based PAC (organic matter ≥30%) stabilizes ecosystems and increases organic matter content by 106%. Following application in a mine remediation project jointly undertaken by Shanxi Xinhuasheng Carbon and its client, soil lead levels decreased from 1200 mg/kg to 42 mg/kg.

Cost-controlled with high long-term benefits

Heavy metal remediation: The cost of long-lasting modified GAC is 150 yuan per mu (one-fourth of that for chemical leaching), reducing the annual remediation cost for a project with Shanxi Xinhuasheng Carbon's partner from 4 million yuan to 1.5 million yuan.

Organic matter degradation: The microbial filter layer on mesoporous GAC has a service life of ≥5 years, with annual maintenance costs reduced from 1 million yuan to 200,000 yuan.

Environmental stability: Biochar-based PAC costs 120 yuan per mu and requires no secondary restoration for five years, saving a cooperative client of Shanxi Xinhuasheng Carbon a total of 2 million yuan annually in a grassland project.

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

The product has obtained certification in accordance with GB 15618-2018 (Soil Pollution Risk Management), EU Regulation (EU) 2018/841, and the U.S. EPA Superfund Standard, fully meeting global ecological restoration requirements. Following its application in a wetland restoration project for a client of Shanxi Xinhuasheng Carbon, it received support from the EU Ecological Restoration Fund.

X. Cost Analysis

Taking a 100-mu mine restoration project as an example, compare the cost differences between the activated carbon process and traditional methods:

project	Long-term modified GAC + mesoporous GAC for bacterial loading + biochar-based PAC process	The process involves soil coverage, microbial degradation, and organic fertilization.
Initial Investment (Ten Thousand Yuan)	250-350	600-800
Annual Operating Costs (Ten Thousand Yuan)	170（150+20+0）	500（400+100+0）
Annual cost for secondary repairs (in ten thousand yuan):	0	200
Total Life Cycle Cost (RMB 10,000/year)	170-270	700-900
Ecological Restoration Fund (in ten thousand yuan)	0	0
Net Income (Ten Thousand Yuan per Year)	-170 (Investment + Operation)	-700 (Investment + Operation + Secondary Maintenance)

XI. Why Choose Us?

Performance endorsement: We have served clients in ecological restoration projects including the Hunan Heavy Metal-Polluted Farmland Remediation Project (China's first project certified under GB 15618 standards), the Dutch Wetland Restoration Project (supported by the EU Ecological Restoration Fund), and the California Mine Remediation Project in the United States (compliant with EPA Superfund standards). Our activated carbon solution, renowned for its capability to "completely eliminate heavy metals and degrade organic compounds," has received unanimous acclaim. A mining remediation company collaborating with Shanxi Xinhua Shengtan applied our long-lasting modified GAC+ mesoporous GAC loaded with microorganisms; as a result, soil lead levels dropped from 1,200 mg/kg to 42 mg/kg, achieving a 100% project acceptance rate and recovering losses totaling 3 million yuan.

Technical capabilities: Developed solutions tailored for ecological restoration, including "long-lasting modified GAC loaded with sulfides (lead adsorption capacity: 200–300 mg/g)", "bacterial-filtered GAC layer with 55% mesopores (PAH removal efficiency>99%)", and "biochar-based PAC with organic content ≥30% (ecologically stable for over 5 years)" to address the limitations of traditional processes such as leakage susceptibility, high residue levels, and rapid degradation.

Global Services: With production bases in Shanxi, Ningxia, and Fujian (with an annual capacity of 45,000 tons), we support "customized production + localized delivery." For overseas clients, we provide end-to-end services including activated carbon selection, pollutant medium testing, and ecological restoration solution design, ensuring response within 72 hours.