Winning Announcement | Secured a wastewater treatment plant renovation and operation project worth over RMB 100 million, marking a major breakthrough for our company in the field of water treatment in high-altitude regions.

Recently, Beijing Zhongkesanshui Environment Technology Co., Ltd. successfully won the bid for the renovation and operation project of the Nenjiang City Wastewater Treatment Plant in Heilongjiang Province, with a total contract value exceeding RMB 100 million. This marks a major breakthrough for the company’s low-sludge-production biological stepped biofilm technology (referred to as the LSP process) in the field of water environment remediation in northern cold regions.

Project Pain Point: Water Management Challenges in Extremely Cold, Low-Temperature Conditions

The original design capacity of this project was 30,000 tons per day; however, due to the long and extremely cold winters in the Nenjiang River region, the wastewater… In winter, the influent temperature can drop as low as 5–8°C. Such low temperatures significantly inhibit microbial activity, causing conventional biochemical processes to readily experience reduced treatment efficiency, fluctuating effluent quality, and insufficient treatment capacity. As a result, standard wastewater treatment processes can typically handle only about 50%–60% of the design flow rate. This will lead to an increase in the project’s scale and investment, as well as poor stability in the effluent water quality.
 

After extensive evaluation and multiple technical comparisons, the owner ultimately selected “Zhongkesanshui LSP Process” Carry out a comprehensive process upgrade.

LSP Process: High‑Cold, Low‑Temperature Stability Meets Standards—Core Principles and Competitive Advantages

2. Unique carrier for enriching ultra-high biomass: The nanofiber carrier boasts a specific surface area exceeding 20,000 m²/kg and an aspect ratio of ≥2,500:1. It has been subjected to hydrophilic and non‑charged surface modifications, resulting in outstanding biocompatibility, high microbial attachment capacity, and resistance to detachment. This enables initial sludge concentrations as high as 15,000–30,000 g/L—3 to 8 times that of conventional processes—and allows cold‑tolerant microorganisms to persist autonomously at low temperatures, thereby preventing widespread deactivation of the microbial community.

5. Solid–Liquid Dual-Phase Synergy: The process establishes a solid–liquid biphasic synergistic system comprising an attached biofilm and suspended floc‑based sludge. The biofilm exhibits strong adhesion, excellent shock resistance, and minimal loss at low temperatures, while the suspended sludge provides supplementary degradation capacity. This dual‑mode operation ensures stable biomass under low‑temperature conditions, preventing abrupt declines.

Cost reduction and efficiency enhancement, tailored to extreme operating conditions in northern regions.

The LSP process not only overcomes technical challenges but also delivers significant advantages in cost reduction, efficiency improvement, and consistent compliance with standards.
 

Relying on abundant biomass to sustain its self‑sufficient purification capacity, this technology eliminates the need for extensive expansion, heating, or excessive aeration typical of conventional processes, reducing energy consumption by more than 50%. At the same time, sludge production is only 10%–20% of that generated by conventional methods, thereby addressing at the source the challenges of sludge dewatering in cold climates, winter freeze‑up, and the high costs associated with off‑site disposal. Furthermore, by leveraging a layered microenvironment within the carrier material to enable nitrification and denitrification, it simultaneously achieves low‑temperature nitrogen removal and phosphorus elimination, resolving the industry‑wide pain point of excessive total nitrogen and total phosphorus levels in northern water treatment plants during winter.

The LSP process is centered on high‑capacity nano‑carriers, the enrichment of stepwise cold‑tolerant microbial consortia, and a stratified, multifunctional microenvironment. It features ample redundancy for low‑temperature degradation, enabling simultaneous efficient denitrification and dephosphorization, ultra‑low sludge production, and long‑term stable operation; it is currently… Optimal technical solutions for the renovation and new construction of aging wastewater treatment plants in cold northern regions.