1. Waste recovery (overview)
As industrialization and urbanization deepen, managing high-salinity effluents from chemicals, pharmaceuticals, agrochemicals, metallurgy, and related sectors has become a major challenge. Conventional disposal routes—landfilling, incineration—are costly (on the order of CNY 2,000 per tonne), land-intensive, and prone to secondary impacts, creating a structural barrier to sustainable growth.
Our approach centers on value re-engineering: turning industrial waste salt from a liability that must be paid to dispose of into a high-value feedstock that can be reused on site or sold. This responds to tightening compliance while aligning economic performance with environmental outcomes. Through resource recovery and circular water management, operators can cut both disposal spend and virgin salt purchases, and open a revenue stream from qualified recovered salts.
2. Wastewater resource recovery and recycling
High-salinity wastewater is the principal source of industrial waste salt. Our integrated line starts at the source, using advanced separation and concentration steps to recover dissolved inorganic salts at scale and upgrade their value.
The design follows circular-economy logic—converting “waste” into “feedstock.” Saleable products include industrial-grade sodium chloride, potassium chloride, sodium sulfate, sodium nitrate, and related salts, with typical market values in the CNY 500–1,500 per tonne range (indicative, market-dependent). Treatment thus shifts from a pure compliance cost centered on discharge limits toward a resource-output model—true wastewater valorization supported by evaporation and crystallization where appropriate.
3. Industrial wastewater valorization
We focus on difficult industrial effluents from chemicals, pharmaceuticals, agrochemicals, metallurgy, and allied industries—streams that are chemically complex and extremely saline, where conventional end-of-pipe options fall short.
The offering is aligned with national green development and circular-economy policy, helping clients stay ahead of tightening environmental rules. By converting complex brines into standardized recovered salt products, we address compliance pain points, strengthen sustainability positioning, reduce policy exposure, and support a durable competitive edge—grounded in industrial water treatment know-how and zero-liquid-discharge-style recovery trains where required.
4. Concentration and recovery by vacuum evaporation and crystallization
The technical backbone of high-yield salt recovery is low-temperature evaporation combined with staged salt crystallization—a closed, multi-step chain:
- Pre-treatment — Thermal–chemical conditioning and polishing to strip organics, heavy metals, and other interferents from waste salt or brine, preparing a clean feed for separation (water treatment and chemical separation technologies).
- Low-temperature evaporation — High-efficiency evaporation systems concentrate the pre-treated liquor, reducing energy intensity per unit water removed and achieving preliminary salt enrichment.
- Staged fractional crystallization — The core of the train. Exploiting differences in solubility among NaCl, KCl, Na₂SO₄, NaNO₃, and other value species under controlled temperature and supersaturation, we deliver sequential, high-purity crystallization and solids handling (crystallization and ZLD recovery).
- Product finishing — Crystallized salts are dried, classified, and packaged automatically to meet commercial specifications for internal recycle or merchant sale.
This multi-stage integration maximizes recovery and product quality. The resulting salts can re-enter process circuits or be marketed as commodity chemicals—completing the transition from waste to resource, supported by our ENVIDEST®-class vacuum evaporation and DESALTS®-class crystallization technology families described on our Technologies page.