Engineering case
Dyeing and Printing Wastewater Treatment Project of Lima (Suzhou) Chemical Fiber Textile Industry Co., Ltd.

Project name: Dyeing and Printing Wastewater Treatment Project of Lima (Suzhou) Chemical Fiber Textile Industry Co., Ltd.
Treatment capacity: 3000m3/d
Influent quality: COD<1500mg/L
Effluent quality: COD<80mg/L
Main technology: hydrolytic acidification+ aerobic treatment+ MBR
Applicable standard: Integrated Wastewater Discharge Standard (GB8978-2012)

Lima (Suzhou) Chemical Fiber Textile Industry Co., Ltd. is a sole proprietorship invested by Lima Group with the cost of USD 151 million and was established in Suzhou Industrial Park in 1997. The Company was formally put into production in 1998. Lima Group is the world famous advanced knitting yarn and advanced knitted fabric and ready-made clothes supplier and has more than 30 years of experience in textile industry. With super quality, competitive price and guaranteed service, the Company has enjoyed high international reputation.

With 3000m3 daily water treatment capacity, the original sewage treatment system of Lima (Suzhou) Chemical Fiber Textile Industry Co., Ltd. was established in 1998 and adopts the treatment process of coagulation+ sedimentation and the COD after treatment can reach 500ppm. As the original sewage system cannot meet new environmental protection requirement, reconstruction was carried out at the beginning of 2014 and the reconstructed sewage treatment system was built on June 1, 2014, which can meet new environmental protection requirement.

The designed water capacity of reconstructed sewage treatment system is 3000m3/d and the designed influent quality index is shown as follows:

Raw Water Quality

Index

pH value

SS

CODCr

BOD5

Chroma

Unit

mg/L

mg/L

mg/L

Times

Value

8-12

-

800-1500

300-600

512-1024

Effluent Quality

Index

pH value

SS

CODCr

BOD5

Chroma

Ammonia nitrogen

Total nitrogen

Unit

mg/L

mg/L

mg/L

Times

Design value

6-9

<10

<80

<15

<30

10

15

Index

Total phosphorus

ClO2

AOX

Sulfide

Anilines

Chromium VI

Unit

mg/L

mg/L

mg/L

mg/L

mg/L

mg/L

Value

0.5

0.5

8

Not be detected

Not be detected

Not be detected

Not be detected