Solution Cases 1: Chemical Wastewater Solution 10,000 m³/d Capacity
Solution Case: Chemical Wastewater
Start Up: March 2016
Capacity: 10,000 m³/d
Sembcorp Industries is a leading energy, water, marine, and urban development group operating across five continents worldwide. With facilities of around 11,000 megawatts of gross power capacity and close to 9 million cubic meters of water per day in operation and under development, Sembcorp is a trusted provider of essential energy and water solutions to both industrial and municipal customers. It is also a world leader in offshore and marine engineering, as well as an established brand name in urban development. In China, Sembcorp utilities are spread over 12 provinces, they have built tens of sewage treatment plants in chemical industrial parks, and provide wastewater treatment services for the chemical companies.
Sembcorp Qidong Water Company is the BOT project in China, providing a complete set of sewage treatment solutions and value-added services for oil, chemical, and pharmaceutical companies in the industrial park. Advanced sewage treatment technology and equipment be adopted in this project after it is completed, the Urban water environment has been greatly improved and it also protects the local river water quality and ecological balance.
Challenge
The design capacity is 10,000m3/d, the influent and effluent parameters of biological treatment as below:
| Project | Unit | Influent | Effluent |
| COD | mg/L | 450 | 90 |
| BOD | mg/L | 330 | 16.5 |
| TN | mg/L | 70 | 14 |
| NH4-N | mg/L | 45 | 4.5 |
| TP | mg/L | 5.5 | 3.3 |
| SS | mg/L | 360 | 30 |
| PH | -- | 6-9 | 6-9 |
| Temperature | ℃ | 10-40 | -- |
Solution
The main process of the sewage treatment plant adopts the technology that combines biological treatment and ozone chemical oxidation, the process flow diagram shows as below:
BioCell MBBR Media
MBBR Media provides two important functions: The protected internal surface area allows the biofilm to attach while supporting either the heterotroph/autotroph bacteria. Second, the millions of pieces of MBBR media act as a shearing device on the course air bubble to maximize oxygen transfer.
Aeration Grid
A stainless steel coarse bubble aeration system is employed to mix the suspended media evenly throughout the reactor while providing the mixing energy required to slough old biofilm from the internal surface area of the media and maintain the dissolved oxygen required to support the biological treatment process.
Results
After 2 months of commissioning and operation, the effluent could promote the criteria, the sewage treatment plant entered commercial operation successfully.
Solution Cases 2: Chemical Wastewater Solution 28,800 m³/d Capacity
Solution Case: Chemical Wastewater
Start Up: July 2014
Capacity: 28,800 m³/d
About MBBR Technology
The main characteristic of Moving Bed Biological Reactor(MBBR) configurations is that there is no sludge recycle from a secondary clarifier. MBBR is essentially a simple, once-through process, where all of the biological activity takes place on the biomass carriers. MBBR is usually followed by a solids separation system such as a secondary clarifier or DAF, to separate bio-solids produced in the process from the final effluent. The main advantage of MBBR is the robust and simple reduction of soluble pollutants (soluble BOD or COD, NH4 +, etc.), with minimal process complexity, utilizing a significantly smaller footprint when compared to conventional aerobic treatment methods. MBBR is typically used for either high load industrial applications or for robust simple-to-operate municipal facilities.
Challenge
The design capacity of the WWTP is 1,200m3/h, below data shows the influent and effluent parameters of the plant:
| Project | Unit | Influent | Effluent |
| COD | mg/L | 1200 | 60 |
| BOD | mg/L | 400 | 10 |
| CI- | mg/L | 16500 | -- |
| Ca2+ | mg/L | 6000 | -- |
Solution
The post MBBR process, for further degradation of refractory organic matters.
Results
The MBBR Influent COD 80~100mg/l, Effluent COD 50~60mg/l, remove rate is more than 30%.
