TY - JOUR
T1 - Treatment of cooling tower blowdown water by using adsorption-electrocatalytic oxidation
T2 - Technical performance, toxicity assessment and economic evaluation
AU - Li, Xiaoliang
AU - Wu, Linjie
AU - Lu, Sijia
AU - Yang, Heyun
AU - Xie, Wenzhou
AU - Zhao, Huiyan
AU - Zhang, Yaozhong
AU - Cao, Xin
AU - Tang, Gang
AU - Li, Hesheng
AU - Feng, Jiangtao
AU - Yan, Wei
AU - Zheng, Xing
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - An eco-friendly process was adopted to treat cooling tower blowdown water (CTBD) and the toxicity of correspondingly produced water/eluate was evaluated using the transcriptional effect level index (TELI) based on toxicogenomics. The objective of the work is to provide a feasible treatment loop including adsorption to remove organics and phosphorus from CTBD, electrocatalytic oxidation to improve the biodegradability of the eluate after desorption. Results showed that PANI/TiO2 was a promising adsorbent in the removal of organics and phosphorus from CTBD and exhibited a satisfied regeneration ability beyond 30 times of reuse. During the electrocatalytic oxidation process the biodegradability of desorption eluate was gradually increasing and BOD5/COD of the oxidized eluate reached 0.4 after 4.8 h of treatment, indicating that the treated wastewater could be returned to the biological treatment loop for further processing. The analysis of the quantitative toxicogenomics assay revealed that the toxicity of CTBD was mainly caused by oxidizing biocides of trichloroisocyanuric acid (TCCA), leading to a significant membrane stress response of bacteria. And the toxicity level of CTBD decreased after adsorption treatment while the desorption eluate experienced increase and then decrease during the electrocatalytic oxidation, meaning that certain oxidation duration was needed to keep the eluate safe for biological treatment. According to economic analysis, the operation cost of treatment loop was estimated at around 0.6 dollars/m3, ensuring high reuse water quality and safe eluate for further biological treatment.
AB - An eco-friendly process was adopted to treat cooling tower blowdown water (CTBD) and the toxicity of correspondingly produced water/eluate was evaluated using the transcriptional effect level index (TELI) based on toxicogenomics. The objective of the work is to provide a feasible treatment loop including adsorption to remove organics and phosphorus from CTBD, electrocatalytic oxidation to improve the biodegradability of the eluate after desorption. Results showed that PANI/TiO2 was a promising adsorbent in the removal of organics and phosphorus from CTBD and exhibited a satisfied regeneration ability beyond 30 times of reuse. During the electrocatalytic oxidation process the biodegradability of desorption eluate was gradually increasing and BOD5/COD of the oxidized eluate reached 0.4 after 4.8 h of treatment, indicating that the treated wastewater could be returned to the biological treatment loop for further processing. The analysis of the quantitative toxicogenomics assay revealed that the toxicity of CTBD was mainly caused by oxidizing biocides of trichloroisocyanuric acid (TCCA), leading to a significant membrane stress response of bacteria. And the toxicity level of CTBD decreased after adsorption treatment while the desorption eluate experienced increase and then decrease during the electrocatalytic oxidation, meaning that certain oxidation duration was needed to keep the eluate safe for biological treatment. According to economic analysis, the operation cost of treatment loop was estimated at around 0.6 dollars/m3, ensuring high reuse water quality and safe eluate for further biological treatment.
KW - Biodegradability
KW - Cooling tower blowdown water
KW - Eco-friendly process
KW - Toxicity
KW - Transcriptional effect level index
UR - https://www.scopus.com/pages/publications/85088993632
U2 - 10.1016/j.seppur.2020.117484
DO - 10.1016/j.seppur.2020.117484
M3 - 文章
AN - SCOPUS:85088993632
SN - 1383-5866
VL - 252
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 117484
ER -