Treatment to crystallization mother liquor containing high concentration of organic and inorganic substances is a challenge in zero liquid discharge of industrial wastewater. Acid precipitation coupled membrane-dispersion advanced oxidation process (MAOP) was proposed for organics degradation before salt crystallization by evaporation. With acid-MAOP treatment CODCr in mother liquor of pulping wastewater was eliminated by 55.2% from ultrahigh initial concentration up to 12

500 mg·L

-1

. The decolorization rate was 96.5%. Recovered salt was mainly NaCl (83.3 wt%) having whiteness 50 brighter than industrial baysalt of whiteness 45. The oxidation conditions were optimized as

C

O

3

= 0.11 g·L

-1

and

C

H

2

O

2

= 2.0 g·L

-1

with dispersing rate 0.53 ml·min

-1

for 100 min reaction toward acidified liquor of pH = 2. Acidification has notably improved evaporation efficiency during crystallization. Addition of H

2

O

2

made through membrane dispersion has eliminated hydroxyl radical “quench effect” and enhanced the deg

radation capacity

in particular

the breakage of carbon-chloride bonds (of both aliphatic and aromatic). As a result

the proposed coupling method has improved organic pollutant reduction so as the purity of salt from the wastewater mixture which can facilitate water and salt recycling in industry.