Industry News
2026-10-14The revised EU Urban Wastewater Treatment Directive (UWWTD) introduces an Extended Producer Responsibility (EPR) mechanism, requiring pharmaceutical and cosmetics companies to bear 80% of the quaternary treatment costs; 2026年9月, Advocate General Kokott of the Court of Justice of the European Union issued an opinion recommending the annulment of this cost-sharing provision. At the same time, the revised Directive tightens the Total Phosphorus limit from 1—2 mg/L to 0.5 mg/L (or 90% removal rate), and Total Nitrogen from 10—15 mg/L to 6 mg/L (or 85% removal rate), and requires Member States to clarify the monitoring and control requirements for micropollutants and PFAS before 2027年12月22日.
I. The Point of Dispute: Who Should Pay for Quaternary Treatment
So-called "quaternary treatment" refers to an advanced treatment stage added beyond conventional secondary biological treatment and tertiary nitrogen and phosphorus removal, targeting micropollutants (pharmaceuticals and personal care products, endocrine disruptors, etc.), with typical processes including ozonation, activated carbon adsorption, and their combinations. Both the investment and operating costs of this stage are considerable, and the EU has therefore introduced an Extended Producer Responsibility mechanism — requiring pharmaceutical and cosmetics manufacturers to bear 80% of the quaternary treatment costs, on the logic of "polluter pays."
This is where the controversy arises. 2026年9月, Advocate General Kokott of the Court of Justice of the European Union issued a legal opinion recommending the annulment of the provision in the revised UWWTD requiring pharmaceutical and cosmetics producers to bear 80% of the quaternary treatment costs. Although the Advocate General's opinion is not ultimately binding, it is often adopted by the Court in practice, and this development is therefore regarded as a major uncertainty for the quaternary treatment financing model.
For the industry, the real question is not "who pays," but whether the timetable will be delayed as a result. The construction period for quaternary treatment facilities is typically measured in years; with the financing model unresolved, utilities find it difficult to launch tenders, and the order rhythm of equipment suppliers fluctuates accordingly.
II. Nitrogen and Phosphorus Limits Sharply Tightened: TP 0.5mg/L, TN 6mg/L
Compared with the financing controversy over quaternary treatment, the tightening of nutrient discharge standards is already written into the text. The revised UWWTD simultaneously and substantially tightens nitrogen and phosphorus discharge requirements:
- Total Phosphorus — the discharge limit is tightened from 1—2 mg/L or 80% removal rate to 0.5 mg/L or 90% removal rate.
- Total Nitrogen — the discharge limit is tightened from 10—15 mg/L or 70%—80% removal rate to 6 mg/L or 85% removal rate.
- Nutrient Recovery — a new nutrient recovery indicator is added, tightening the requirements on phosphorus discharge from wastewater treatment plants and driving a conceptual shift from "nutrient removal" to "nutrient recovery."
The magnitude of this tightening is quite significant. Taking Germany as an example, according to German evaluation standards, the oxygen-consuming substance discharge limits of China's GB 18918 Grade 1A standard are only at the "2 level (low)" level; however, in terms of nitrogen and phosphorus control, the revised EU standards will significantly narrow the gap with Chinese standards — particularly the 6 mg/L Total Nitrogen limit, which is already approaching the stricter level of the quasi-Class IV standard implemented in some regions of China (TN ≤ 10—12 mg/L).
In other words, the EU is shifting the competitive dimension of "effluent quality" from oxygen-consuming substances to nutrients and emerging pollutants. The impact on process routes is structural: advanced denitrification requires more refined carbon source management and anoxic zone design, while ultimate phosphorus removal often means a combination of chemical phosphorus removal and enhanced flocculation, and nutrient recovery brings technologies such as struvite crystallization and sludge phosphorus recovery to the forefront.
III. Micropollutants and PFAS: Entering a Mandatory Standard Framework for the First Time
The revision of the UWWTD incorporates micropollutant control into a legally binding discharge standard framework for the first time. In addition to the quaternary treatment requirements, the revised Directive also sets out dedicated monitoring and control provisions for PFAS and microplastics.
In terms of implementation linkage, the Directive (EU) 2026/805, which entered into force on 2026年5月, serves as an amendment to the Water Framework Directive, expanding the list of priority substances to include PFAS. Member States are required to specify new control requirements by 2027年12月22日, including monitoring methods for "Total PFAS" and "Sum of PFAS," as well as monitoring standards for microplastics in sewage and sludge.
The implementation of these requirements will impose new technical demands on the monitoring capabilities and treatment processes of wastewater treatment plants. For equipment suppliers, two directions of demand will be relatively realistic: first, complete sets of equipment for Ozonation, Activated Carbon, and Advanced Oxidation targeting micropollutants; second, online monitoring and laboratory analysis capabilities for PFAS and microplastics.
IV. Two-Tier Structure: Framework Directive Plus Member State Transposition
To understand the EU standards system, one must grasp its two-tier structure of "Framework Directive + Member State Transposition": the UWWTD sets minimum requirements, and Member States may establish stricter national standards based on their own water environment conditions. This structure ensures unified objectives at the EU level while retaining flexibility tailored to local conditions.
Consequently, countries at the forefront of water environment protection—such as Germany, the Netherlands, and Austria—have national standards significantly stricter than the minimum requirements of the UWWTD. Germany's requirements for nitrogen and phosphorus discharge from wastewater treatment plants far exceed those stipulated in the Directive, while the Netherlands has established an extremely detailed categorized management framework for indirect discharge control of Industrial Wastewater. Companies going abroad to target the EU market cannot simply read the Directive text—they must delve into the implementing regulations of specific Member States.
V. Three Insights for Chinese Enterprises
- Compliance thresholds front-loaded—The EU requires completion of equipment upgrades for nutrient removal and advanced micropollutant treatment by 2027年, which is expected to drive investment growth in related equipment. If Chinese enterprises participate as equipment providers or general engineering contractors, they need to incorporate TP 0.5mg/L, TN 6mg/L effluent guarantees, safety specifications for Ozonation and Activated Carbon units, and PFAS monitoring requirements into their technical proposals in advance.
- Shifting the technology narrative from "removal" to "recovery"—The introduction of nutrient recovery indicators means that phosphorus recovery is no longer a bonus item but a compliance item. Enterprises with technical reserves in sludge phosphorus recovery, struvite crystallization, Anaerobic digestion, and biogas utilization are more likely to gain recognition in technology roadshows in the EU market.
- Attention to variables in financing models—The outcome of the EPR controversy will directly affect the pace of advancing quaternary treatment. It is recommended to bind project tracking with policy tracking to avoid rework of proposals for projects under construction or bidding due to regulatory adjustments.
VI. Industry Observation: Global Standards Are Converging in the Same Direction
Looking at EU developments alongside China's recent standards changes, a common trend emerges: discharge control is moving from daily averages to instantaneous values, from conventional pollutants to emerging pollutants, and from end-of-pipe discharge to resource recovery.
China's amendment to the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB 18918—2002) has added instantaneous values for 4 major water pollutants including Chemical Oxygen Demand, ammonia nitrogen, Total Nitrogen, and Total Phosphorus, and adjusted pH, color, and fecal coliform count from daily averages to instantaneous values. Meanwhile, during the "15th Five-Year Plan" period, the target for unconventional water utilization exceeds 300亿 cubic meters, and Reclaimed Water is being incorporated into unified water resource allocation. The EU, in turn, is simultaneously ramping up efforts across three dimensions: nutrients, micropollutants, and resource recovery.
The consistency in direction means that in the coming years, the competitive focus of wastewater treatment technology will be relatively clear: whoever can stably push nitrogen and phosphorus to their limits with lower energy and chemical consumption, while recovering nutrients, water resources, and energy, will hold the passport for the next round of standards upgrades. This is also the inevitable path for China's environmental protection equipment to move from cost-performance competition to technology competition.
TIANYI TECH (TIANYI LIMITED) has long been deeply engaged in the fields of wastewater treatment and Reclaimed Water Reuse. Centering on three major directions—low-carbon processes, resource recovery, and Smart Water operations—the company provides full-chain services from solution design, equipment manufacturing, and engineering construction to operation management for municipal wastewater treatment plants, Industrial Parks, and various water-using entities. With the goal of "stable compliance, energy saving and consumption reduction, and resource circulation," the company continuously tracks domestic and international standards changes, helping clients to plan ahead in upgrading and resource-oriented transformation.
Source: EU Urban Wastewater Treatment Directive (UWWTD) revised text and publicly available information on relevant proceedings of the Court of Justice of the European Union, Directive (EU) 2026/805, China Water Network "Current Status and Prospects of the Development of Domestic and International Municipal Wastewater Treatment Plant Discharge Standards" (2026年9月29日), and publicly available industry research.
