ZHANG, Rihong

PURIFICATION OF RIVER WATER QUALITY USING PRECAST POROUS CONCRETE PRODUCTS

Abstract eng:
Laboratory test on effects of porous concrete to water quality improvement in artificial sewage water was performed. In-situ test using water channel confirmed the purifying function of precast porous concrete products on water quality. Purification practice to improve water quality of an urban river by placing precast porous concrete products in the river was conducted. For the porous concrete using in the tests, two different sizes of coarse aggregate of 5~10, 10~15 mm were used. Three void contents of 20, 25 and 30 percent were designed for the porous concrete. Variation of water quality indexes of biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), total phosphorus (T-P) and total nitrogen (T-N) was observed in the laboratory test and in-situ test. It was found that during the period of 70~170 days from the experiment started, void content of porous concrete did not influence the purifying ratio of TOC in sewage and the purifying ratio of TOC in laboratory by porous concrete was around 60 to 80 percent. The purifying ratio of T-P in laboratory was about 20~40 percent, whereas river water purification test showed a high purifying ratio of T-P. It was found that BOD, COD of the river water decreased about 30 to 60 percent by placing porous concrete products in the river.

Contributors:

NAKAZAWA, Takao

Publisher:

Japan Concrete Institute, Tokyo

Conference Title:

Proceedings of the First International Conference on Concrete Sustainability

Conference Title:

First International Conference on Concrete Sustainability

Conference Venue:

Tokyo (JP)

Conference Dates:

2013-05-27 / 2013-05-29