Updated: July 2002

1. Purpose

This is the advanced wastewater treatment system designed to remove COD and colors due to organic compounds that are not biologically decomposable. Conventionally, COD treatment has been performed by the activated carbon absorption process or the ozone oxidation process. However, both processes are relatively costly and do not produce sufficient results. The A-Hipo process is based on advanced COD treatment technology to overcome these shortcomings.
The A-Hipo Process is capable of treating a variety of COD substances, while offering ease of operation, high treatment efficiency, and low running cost.

2. Performance and Characteristics

1) Substances treated by the A-Hipo process: Surface-active agents, lignin, humic acid, dyes, bile pigments, organic chlorine compound, phenol-based cyclic compounds, cyanide, and other organic synthetic compounds.
2) Treatment capacity

wastewater source       Raw water COD      Treated water COD
Coal/chemical             150mg/l               20mg/l
Pharmaceutical            240mg/l               40mg/l
Dye/bleaching              45mg/l               10mg/l
Paper/pulp                 80mg/l               10mg/l

3) Running cost
The cost to operate the A-Hipo process is ½ to 1/6 that of the activated carbon absorption process.
Also, the process can be used as pre-treatment before the activated carbon absorption process, significantly reducing a saturated absorption level and thus extending service life of activated carbon by 5 to 10 times.

3. Operating Principle

As shown in the flowchart, the wastewater treatment systems consists of an acidic coagulation process and a chemical oxidation process using hydroperoxide. The two process supplement each other to achieve highly effective and reliable treatment.
1) The acidic coagulation process can effectively remove high polymer organic compounds that are not biologically decomposable. Removal of high polymer compounds in the process boosts the efficiency of the subsequent treatment process - chemical oxidation process-dramatically.
2) The chemical oxidation process oxidizes and decomposes COD constituents, organic chloride compounds, phenol-based cyclic compounds, and cyanide by a powerful oxidation effect of OH radical that is generated by the hydroperoxide-iron catalyst (Hipo) process. This is generally called Fenton reaction, and reduction of reaction time and improvement of treatment efficiency are ensured by setting conditions suitable for treatment of wastewater.

4. Major Features

1) High treatment efficiency and reliability.
2) Ease of operation.
3) The running cost is ½ to 1/6 that of the activated carbon absorption process.
4) A wide range of contaminant can be treated.
5) High flexibility and economy suitable for improvement of existing system.

Flowchart