INDUSTRY SOLUTIONS FOR WASTEWATER TREATMENT

PETROLEUM INDUSTRY
WASTEWATER SOLUTIONS

The GEM® System helps China National Petroleum Corporation (CNPC) Dushanzi Petrochemical To Optimize Wastewater Pretreatment Performance.

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CASE STUDY

Petrochemical Industry Reduces Wastewater Costs

PETROCHEMICAL INDUSTRY WASTEWATER TREATMENT SOLUTIONS

Our client, CNPC Dushanzi Petrochemical Ethylene Factory (China National Petroleum Corporation (CNPC) has 4 production lines of styrene-butadiene rubber. The factory adds sodium polycarboxylate + calcium chloride during the production process. This improves the dispersion of the compounding ingredients in the rubber, shortening the mixing time and improving the physical and mechanical properties of the rubber. Clean Water Technology had the opportunity to participate in the retrofit project, for which the GEM® System treatment solution was carefully prepared.

Challenge

Polycarboxylate is a negatively charged surfactant and dispersant with a hydrophobic molecular backbone and hydrophilic side chains. This unique molecular structure encapsulates the gel particles through the action of spatial site resistance, electrostatic repulsion and solvent chains. It is difficult for colloidal particles to aggregate and merge until they are stably dispersed in the solution.

The wastewater discharged from the factory contains polycarboxylates and microfine rubber particles, resulting in the failure of the downstream wastewater treatment facilities to work properly. Polycarboxylate makes the aeration tank produce a large number of bubbles. This ensures that the rubber particles adsorb the oil slick to maximize the oil skimming device’s effect.

Annotated diagram of a Dissolved Air Flotation (DAF) system. The diagram clearly labels the LSGM Heads, Inlet of Chemical, Effluent, Sludge Hopper, Control Panel, Air Compressor, Sludge Pump, and Feed Pump, all essential components of the water treatment process by CWT Global.
Side-by-side image of two jars, one containing murky water and the other containing clear water. Illustrates the results of CWT Global's clean water technology and wastewater treatment services, highlighting the significant improvement in water quality achieved.
Before & After Water Treatment | CWT Global

Solution

CNPC’s Dushanzi Petrochemical Ethylene Factory has been looking for technology to overcome this wastewater treatment problem for a long time. Finally, in 2015 Clean Water Technology had the opportunity to participate in the retrofit project, for which the GEM® System treatment solution was carefully prepared. At the end of the year, the client’s long-standing wastewater pretreatment problems were successfully solved!

For this project, CWT uses the GEM® System by adding PAC (polymerization aluminum chloride), cationic PAM (polyacrylamide aluminum chloride) and anionic PAM. Consequently, the steady-state system of wastewater is destroyed and polycarboxylate and microfine colloidal particles are removed from the wastewater.

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Key Advantages

  • Best removal rates
  • Flexibility to changing hydraulic andcontaminant loadings
  • Chemical savings of 20% to 80%
  • Smaller footprint (50-90% smaller) than conventional technologies.
  • Sludge content between 8% to 12%Over 20% drier sludge (after decant)
Also See GEM® System

CATEGORY

PAC

CATION PAM

ANION PAM

SPECIFICATION

Aluminum oxide ≥28%

Molecular weight ≥800w

Molecular weight ≥1200w

DOSAGE

200 mg/L

20 mg/L

14 mg/L

Item

Inlet polycarboxylate mg/L

Suspended inlet water SS mg/L

Effluent polycarboxylate mg/L (Target value: 2)

Suspended in the effluent SS mg/L (Target value: 20)

Main pollutant removal rate

Sample 1

88.4

106

0.64

6

>99.2%

Sample 2

108

120

0.22

8

>99.5&

Sample 3

100.7

107

0.17

10

>99.8%

Sample 4

128.6

110

0.92

6

>99.2%

Conclusion

Clean Water Technology meticulously selects top-quality chemicals, tailoring their optimization to match the removal rates of key pollutants. The process culminates in delivering clients with consistently exceptional results.

Impressed by the GEM® System’s unique, stable, and outstanding performance, Dushanzi Petrochemical successfully resolved its wastewater pretreatment challenges that they had experienced for several years. Just one year later, they acquired a second GEM System (Model GEM System 150/300) for the Phase 2 project.

CWT remains dedicated to addressing clients’ wastewater treatment needs, moreover in delivering tailored treatment processes and equipment to ensure optimal solutions.

The GEM® System is a new age primary wastewater treatment technology that out-performs conventional DAF (dissolved air flotation) systems. This bakery not only met their goals of being in compliance with the contaminant levels of effluent water, but saved significant money in surcharges, chemicals, space, and time.

The GEM® System can be adjusted as production levels increase without additional construction or equipment. Simple tweaking of the patented Liquid Solid Gas Mixing (LSGM) heads, allows the system to keep up with increasing demands in flow and contaminant levels.

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Simplified process flow diagram illustrating a wastewater treatment process, likely for Polycarboxylate WW. Shows treatment stages, including Raw WW Tank, GEM System, Buffer Tank, and Sludge Bin with Effluent and Sludge Haul Away.
Wastewater Treatment Flow Diagram | CWT Global
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