Biological Nitrogen Removal (BNR) represents the gold standard in environmental engineering for mitigating eutrophication, restoring aquatic ecosystems, and complying with increasingly stringent global environmental regulations. Rapid industrial expansion, combined with urban population growth, has escalated total nitrogen (TN)—encompassing ammonia nitrogen ($NH_4^+-N$), nitrate ($NO_3^--N$), nitrite ($NO_2^--N$), and organic nitrogen—to the forefront of regulatory compliance priorities worldwide. Modern municipal wastewater treatment plants (WWTPs) and complex industrial facilities (pharmaceuticals, petrochemicals, coal chemicals, food processing, and textile dyeing) face rigorous effluent thresholds (e.g., EU Water Framework Directive requiring TN < 10 mg/L; China Class 1A/1B standards; US EPA National Pollutant Discharge Elimination System limits).
As a premier OEM Biological Nitrogen Removal Manufacturer & Exporter, Smedic Technology Co., Ltd. delivers integrated chemical-engineering solutions designed to optimize heterotrophic denitrification, accelerate autotrophic nitrification, and dramatically reduce operational expenditure (OPEX). By replacing traditional single-component carbon additives (such as toxic methanol or high-sludge-yielding sodium acetate) with proprietary bio-enhanced compound carbon sources, Smedic empowers international EPC contractors, municipal operators, and industrial conglomerates to maintain baseline compliance while cutting carbon consumption costs by 20% to 35%.
Established in 2011, Smedic Technology Co., Ltd. has evolved into a world-class comprehensive solution provider specializing in environmental protection agents. Integrating R&D, chemical synthesis, field technical support, and global supply chain logistics, Smedic provides high-efficiency customized chemicals across municipal sewage, complex industrial wastewater, potable tap water treatment, mineral processing, and oilfield extraction sectors.
Headquartered in Beijing, China, Smedic operates state-of-the-art wholly-owned chemical manufacturing hubs across Hebei, Guizhou, and Shanxi provinces, supported by over ten strategic joint-venture facilities and regional logistics distribution centers in Shandong, Anhui, Guangxi, and Sichuan. Our corporate network spans over 20 domestic provinces and services international clients across Asia, the Middle East, Europe, and the Americas.
Recognized as a National High-Tech Enterprise and a National Specialized, Refined, Unique and Innovative "Little Giant" Enterprise, Smedic ranks among the most trusted brands in high-end water treatment chemical manufacturing. We have been awarded the title of "Leading Brand of Advanced Wastewater Treatment Chemicals" and "Most Valuable Water Treatment Chemicals Brand" by China Water Network and the E20 Environmental Platform for four consecutive rating cycles.
Our strategic partnerships include centralized procurement arrangements with global water engineering conglomerates such as Shouchuang Ecological and Environmental Group, Yangtze River Ecological and Environmental Group, Beijing Enterprises Water Group, and China Water Environment Group.
Foundation of Smedic in Beijing. Rapid deployment of comprehensive chemical product portfolios for municipal wastewater systems.
National High-Tech accreditation. Expansion of production bases in Hebei, Shandong, and Guizhou, scaling capacity beyond 1 Million Tons/Year.
Awarded National "Little Giant" Enterprise status. Established Class A Hebei Provincial Enterprise Technology Center for advanced water purification.
National Intellectual Property Advantage Enterprise. Launch of joint venture with Chengdu Institute of Mineral Comprehensive Utilization.
At the core of Smedic's technical superiority is a multi-tiered research architecture comprising one academy, three research institutes, and five production-testing bases. Our core scientific committee features leading academicians, doctoral researchers, senior chemical engineers, and environmental microbial specialists.
Smedic operates an Expert Workstation in direct technical partnership with the Tsinghua University Association of Senior Scientists and Technicians. We maintain joint R&D laboratories with Shandong University and Beijing University of Technology, while acting as the commercialization partner for IP generated at Peking University and Tianjin University.
Officially recognized as a Class A R&D Institution, Smedic hosts the Hebei Provincial Enterprise Technology Center, the Hebei Advanced Water Treatment Chemicals Technology Innovation Center, and the Cangzhou Water Treatment Engineering Research Center.
Holding 60+ authorized national patents (including 40+ invention patents), Smedic has spearheaded over 10 national and sectoral standard formulations, covering Composite Carbon Sources, Composite Coagulants, Sodium Acetate, and Nitrifying/Denitrifying bacterial formulations.
Smedic’s bio-enhanced denitrification carbon sources and deep multi-nuclear phosphorus removal agents have completed official technology appraisal by the Science and Technology Department of Hebei Province, rated as "Internationally Advanced" and filling critical technological gaps within the domestic wastewater sector. Our Inorganic-Organic Covalent Bond Flocculant was awarded the prestigious 22nd China Patent Award and the First Prize for Technological Invention from the China Petrochemical Industry Association.
Biological Nitrogen Removal relies on a sequence of microbial biological transformations: initial aerobic conversion of organic nitrogen and ammonia into nitrate ($NO_3^-$) via nitrifying bacteria, followed by anoxic heterotrophic reduction of nitrate into inert nitrogen gas ($N_2$) by denitrifying organisms. Optimizing chemical dosing kinetics is critical to overcoming stoichiometric limitations and kinetic bottlenecks.
Nitrification is a two-step obligate aerobic process mediated by Ammonia-Oxidizing Bacteria (AOB, e.g., Nitrosomonas) and Nitrite-Oxidizing Bacteria (NOB, e.g., Nitrobacter, Nitrospira):
Nitrification requires significant alkalinity (approx. 7.14 g $CaCO_3$ per g $NH_4^+-N$ oxidized) and dissolved oxygen ($DO > 2.0\text{ mg/L}$). Smedic supplies specialized pH buffer regulators and trace micronutrient bio-stimulants to protect Nitrifiers against heavy metal toxification and low-temperature inhibition.
Denitrification takes place in anoxic environments ($DO < 0.5\text{ mg/L}$), where facultative heterotrophic microorganisms utilize nitrate as an electron acceptor to oxidize organic carbon compounds into $N_2$ gas:
In practice, due to biomass synthesis and competing dissolved oxygen, real-world COD/N ratios range from 4.0 to 6.0. Standard carbon sources often result in excessive sludge generation or high operating costs. Smedic's custom bio-enhanced carbon sources optimize this ratio down to 3.5–4.2 g COD/g N.
| Parameter / Carbon Type | Methanol ($CH_3OH$) | Sodium Acetate ($CH_3COONa$) | Glucose / Starch ($C_6H_{12}O_6$) | Smedic Bio-Enhanced Carbon Source (OEM) |
|---|---|---|---|---|
| COD Equivalent (mg/g) | 1,500,000 | 780,000 | 1,000,000 | 1,000,000 - 1,300,000 (Tailored) |
| Denitrification Rate ($r_{dn}$) | Slow (Requires Acclimation) | Fast | Moderate (Risk of Bulking) | Ultra-Fast (Instant Activation) |
| Low-Temp Activity (<10°C) | Very Low | Moderate | Poor | High (Specialized Micro-Co-factors) |
| Sludge Yield ($Y_n$) | Low (0.3 g VSS/g COD) | High (0.45 g VSS/g COD) | Very High (0.55 g VSS/g COD) | Optimized Low Yield (<0.25 g VSS/g COD) |
| Safety & Handling | Hazardous / Flammable (Class 3) | Non-hazardous / Crystallizes | Non-hazardous / Ferments | Non-hazardous / Liquid Stable / Non-flammable |
| Cost per Ton TN Removed | High Risk (Price Volatile) | High Unit Cost | Moderate | Lowest (20-35% Total OPEX Savings) |
As a globally recognized OEM Biological Nitrogen Removal Manufacturer & Exporter, Smedic offers end-to-end contract chemical manufacturing tailored to international distributor brands, environmental engineering firms, and municipal operators.
We engineer liquid and solid biological carbon sources, inorganic coagulants (PFS, PAC), and synthetic flocculants (APAM, CPAM) based on site-specific influent COD:N:P ratios, ambient temperature profiles, and reactor residence times. Private labeling, custom concentrations, and proprietary biochemical blends are fully supported.
Our strategic distribution hubs adjacent to major ocean ports enable rapid delivery in IBC totes (1000L), flexitanks (24,000L), 200L drums, and 25kg multi-wall sealed bags. We provide complete GHS-compliant SDS, Certificates of Analysis (COA), REACH compliance documentation, and ISO-certified quality assurances.
Every batch undergoes multi-stage quality validation, including ICP-OES trace metal analysis, TOC/COD verification, viscosity testing, and biological activity bench assays. Our zero-defect release policy guarantees batch-to-batch consistency and long-term shelf stability under diverse climate conditions.
Smedic Tech
