Zero discharge of high salt and organic wastewater
Typical treatment process: pre-treatment+evaporation+biological treatment+deep treatment
Pretreatment: mainly including soften reaction tank, coagulation sedimentation tank, etc
Evaporation: including multi effect evaporation, MVR, etc
Biological treatment: mainly using membrane bioreactor (MBR)
Advanced treatment: membrane process(NF,RO)，non membrane process such as "secondary fenton oxidation+biological treatment" have also begun to be used in engineering
The incoming water with high organics and TDS. High TDS （>20000ppm）cann’t degrade COD by biological treatment. The process is mainly biochemical after desalting, and the final product is the qualified water, biochemical sludge and mixed salt.
Pretreatment process
High density sedimentation tank
- adjust pH;
- Removing alkalinity and hardness ions by adding chemicals；
- Dosing to remove suspended solids
V filter
- Filter to remove suspended solids；
- Automatic operation, adaptable to fluctuations in water quality and quantity；
- Large treatment water.
Biological treatment
Membrane bioreactor(MBR)
Inlet water pollutant indicators:
- COD：≤20000mg/L
- BOD5/COD：≥0.3
- NH3-N： ≤ 2500mg/L
- BOD5/NH3-N: ≥ 5
Advanced Treatment
Nanofiltration(NF) and Reverse osmosis（RO）
Inlet water pollutant indicators for NF process
- COD： ≤1200mg/L
- BOD5： ≤ 30mg/L
- Oxidation-reduction potential （ORP）：＜200mg/L
- Inlet water pH: ＜ 7
Inlet water pollutant indicators for RO process
- COD：Roll RO ≤ 1000mg/L，DTRO≤10000mg/L
- Oxidation-reduction potential （ORP）： ＜ 200mg/L
- Max inlet SDI15:Roll RO ＜ 5，DTRO ＜ 6.5
- NH3-N ：Roll RO＜50mg/L，DTRO ＜ 800mg/L;
- Inlet water pH: ＜ 7
Disc tube reverse osmosis(DTRO)
- Separate concentrated solution and permeate solution O-ring
- Low pre-treatment requirements and strong pollution resistance
- Effectively avoiding membrane blockage and concentration polarization phenomenon
