HAO Xiao-di,GAN Wei,LI Ji,et al.Effectiveness of Ozonation on Oxidizing Secondary Effluent Organic Matter (EfOM) from WWTP[J].China Water & Wastewater,2021,37(10 10):1-7.
Effectiveness of Ozonation on Oxidizing Secondary Effluent Organic Matter (EfOM) from WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
10 10
Page:
1-7
Column:
Date of publication:
2021-05-17
- Keywords:
- effluent organic matter (EfOM); ozonation; intermediates/oxidized by-products; ammonia nitrogen
- Abstract:
- To control black and malodorous water, the effluent discharge standards (especially for COD) of wastewater treatment plants in China are increasingly upgraded. Under the circumstance, some advanced treatment processes, especially ozonation, have been applied to the treatment of effluent organic matter (EfOM). Ozonation can indeed remove EfOM at an extent, including such micropollutants as pharmaceutical, personal care products (PPCPs) and endocrine disrupting chemicals (EDCs). However, refractory organic substances would be converted into readily biodegradable ones by incomplete ozonation, which could aggravate oxygen consumption in receiving waters, and moreover formed toxic intermediate products and/or oxidation by-products would also increase the secondary risks of ecology and human health. Therefore, it is questionable to blindly increase the COD standard of effluent for reducing oxygen-consuming substances. In fact, EfOM after biological treatment consists of inert organic substances that are difficult to biodegrade, which would rarely consume oxygen even if being discharged into receiving waters. For this reason, developed countries such as European, north American countries, etc. do not over-control COD (even no limit in some countries); instead, they strictly control BOD5 and NH4+. Furthermore, both investment and operational cost of ozonation are much higher than conventional processes, which might put a negative impact on the total environment.
Last Update:
2021-05-17