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Wastewater Treatment Process

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Advance wastewater treatment process

Advance wastewater treatment process is the method that used to remove suspended solid and dissolved substances remaining after secondary wastewater treatment unit. The terms of dissolved substances refer to calcium, potassium, sulfate, nitrate, and phosphate. Advanced wastewater treatment technologies include : filtration, biological nutrient removal system, ion exchange, chemical, oxidation, chemical precipitation, reverse osmosis, electro-dialysis, and gas stripping.

Impacts of residual constituents

Dissolved substances that contained in discharge water can lead to both environmental and human health problems. The environmental problems such as eutrophication, eutrophication can be taken place when …show more content…

When P and N discharged into lake or water bodies, its can promote eutrophication. So that both N and P must be removed to prevent oxygen deficit in water bodies. There are numerous processes that can be used to remove N and P such as Nitrification, Nitrification/denitrification, A/O , A2/O, Bardenpho, UCT, VIP, Air stripping, Breakpoint chlorination, ion exchange, and chemical precipitation. All of methods have pros and cons. The selection of appropriate method which match with the wastewater characteristic is important. A brief of information of the N and P removal technologies will be summarized as the …show more content…

The main idea of the process is to convert ammonia to nitrate which less toxicity. The nitrification process can be classified in term of carbon oxidation and nitrification, then it can divide in two stage, single-stage and separate-stage. Single-stage refers to carbon oxidation and nitrification are combined in one reactor. Separate-stage means the carbon oxidation and nitrification occurred separately. The effectiveness of both single and separate-stage depend on BOD5/TKN ratio and the pH.
- Nitrification/denitrification process : the purpose of the process is to remove soluble nitrogen by converting to gaseous nitrogen.
- A/O process : The A/O process is the system that used for removal phosphorus. The system combined anaerobic and aerobic condition in series. In anaerobic tank, phosphorus contained in wastewater and recycled cell mass is released as soluble form (orthophosphate). In aerobic tank, orthophosphate will be taken up PAOs-phosphorus accumulating organisms.
- Bardenpho (five stage) : This process was developed for both N and P removal
- A2/O process : This process was modified from A/O process by adding anaerobic tank for promoting

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