Peculiarity
The wastewater is characterized by low volume, high concentration, and complex composition, with numerous by-products. The raw materials used in reactions are often solvents or cyclic compounds, making the wastewater difficult to treat.
Some synthetic wastewater streams contain high ammonia nitrogen, high total nitrogen, and high total phosphorus, with CODcr levels reaching several hundred thousand mg/L, posing severe treatment challenges.
The wastewater contains many toxic and hazardous substances, including halogenated compounds, nitro compounds, and dispersants or surfactants with antimicrobial properties, which are harmful to microbial activity.
The wastewater also contains a large proportion of refractory organics, with low BOD/COD ratios (B/C) and poor biodegradability.
High colour intensity.
Q&A.
The treatment process is lengthy, and the pretreatment stage incurs high operational costs with unstable performance.
Fluctuations in the concentration of toxic and refractory organics often exceed the tolerance threshold of microorganisms, causing system shocks and resulting in ammonia nitrogen, total nitrogen, and CODcr levels exceeding discharge limits.
The treatment load exceeds the designated capacity, limiting the production.
Equipment maintenance in production workshops leads to variations in influent quality, and once the system is shocked, recovery is difficult.
Elevated effluent CODcr, ammonia nitrogen, and turbidity significantly increase the cost in the advanced treatment stage, particularly for dual-membrane systems.
Solution
