Industrial Wastewater Reuse Becomes Mandatory in the Bursa Textile Basin

Structural Transformation for the Textile Sector

The Ministry of Environment, Urbanization and Climate Change has issued the industrial wastewater reuse communiqué covering textile finishing plants in the Bursa basin. The communiqué introduces a 60 percent reuse threshold for textile plants in the basin that consume more than 100,000 cubic metres of water annually. The compliance deadline is set for the end of 2028.

The regulation is regarded as the most comprehensive sector-specific communiqué designed against the backdrop of Turkey's structural water stress and alignment obligations under the EU Green Deal. The textile sector ranks among the highest in national industrial water consumption.

Profile of the Bursa Basin

The Bursa basin hosts roughly 35 percent of the country's textile finishing capacity. Annual water consumption in the sector is around 110 million cubic metres. Municipal water consumption in the basin is 145 million cubic metres in the same period. The proximity of these two figures illustrates the scale of pressure the textile sector places on the basin.

Critical indicators for the basin's water resources:

Uludağ snowmelt has been 28 percent below the average over the last five years
Groundwater levels are on a declining trend of 0.8 metres per year
Climate projections forecast a 12 percent reduction in annual average rainfall

These three indicators position water as a structural constraint for the textile sector.

Technical Framework of the Communiqué

The communiqué adopts a performance-based approach. No specific technology requirement was placed on sector representatives; instead, a requirement was set that 60 percent of the inlet water volume must be reused and reintegrated into processes. Sectoral guides list the most common solution portfolio as:

Membrane bioreactor (MBR) based advanced treatment
Nanofiltration and reverse osmosis
Electrochemical colour removal
Advanced oxidation (ozone and UV/H₂O₂)
Zero liquid discharge (ZLD) systems for salt concentrate management

Pilot plant data show that combined systems achieve 70-85 percent reuse at a production cost of 0.42-0.68 dollars per cubic metre. Payback period is reported in the 4-6 year range.

Non-Compliance Sanctions

The communiqué includes a tiered enforcement structure:

End of 2028: first compliance check, written warning for plants below the threshold
2029: 40 percent additional surcharge on the set water tariff
2030: capacity expansion permits suspended
2031 and onwards: review process for the operating permit

The Ministry has also structured a financing mechanism in parallel to support the compliance process. A 35 percent grant is available for reuse investments under a joint KOSGEB and TÜBİTAK fund. A framework agreement with the European Investment Bank lowers sector lending costs by 200 basis points.

The Salt Concentrate Issue

A key technical challenge of reuse systems is managing the reverse osmosis concentrate stream. Textile finishing wastewater has a profile rich in salt, dye and auxiliary chemicals. The concentrate stream can create a new source of pollution under classic discharge scenarios.

The communiqué offers two options here:

Integration into a zero liquid discharge (ZLD) system
Routing the concentrate stream to a central salt recovery plant

Three central salt recovery plants planned in the Bursa basin are being set up under a shared service model in industrial zones. The plants will reduce concentrate management costs across the sector by 40 percent compared to individual plant scale.

Linkage to the EU Supply Chain

The regulation directly affects Turkish textile exports' position in the EU market. EU retail giants have been treating reuse performance as a priority item in supplier audit forms over the past three years. The pace at which the Turkish textile sector adapts is directly tied to its export performance.

The widening scope of the CBAM and border carbon mechanisms is shifting water reuse from an environmental performance indicator to an economic competitiveness indicator for the textile sector.

Implications for the Sector

The Bursa communiqué signals investment for three categories:

Order pipeline expansion for membrane and advanced treatment equipment suppliers
A new market for ZLD and salt recovery infrastructure specialists
Integration demand for digital monitoring software suppliers

The next three years are shaping up as a period of structural transformation for the Bursa textile basin. The roll-out timetable for the model in the Denizli, Tekirdağ and Gaziantep textile basins is among the central topics on the sector's agenda.