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Combined system for wastewater treatment: ozonization and coagulation via tannin-based agent for harvesting microalgae by dissolved air flotation
Environmental Technology ( IF 2.8 ) Pub Date : 2020-10-06 , DOI: 10.1080/09593330.2020.1830181
Gislayne Alves Oliveira 1 , Ênio Leandro Machado 2 , Rhauani Segatto Knoll 3 , Naira Dell'Osbel 4 , Gustavo Stolzenberg Colares 4 , Lúcia Ribeiro Rodrigues 1
Affiliation  

ABSTRACT

This study evaluated the performance of urban wastewater treatment in pilot-plant by an integrated system consisting of anaerobic reactor, microalgae cultivation, Venturi tube ozone recirculation, coagulation/flocculation with tannin-based agent natural coagulant, and dissolved air flotation (DAF). Ozone concentrations (without ozone, 0.13 and 0.25 mg O3/mg of biomass) and tannin dosages (65, 85 and 105 mg/L) were evaluated regarding microalgae separation and their influences on wastewater treatment performance. During the experiments, it was verified that the treatment efficiency increased when ozone was applied and with higher tannin dosages. The best results were found with 0.13 mg O3/mg of biomass and 105 mg/L of tannin, obtaining excellent removal of turbidity removal (99.4%), apparent colour at 420 nm (94.5%), TN (83.2%), N-NH3 (100%), TOC (86.8%), BOD5 (86.5%) and COD (100%), 47.6% reduction in electric conductivity, 46.1% in TDS, 66.4% TP removal for the integrated system and 84% microalgae biomass recovery were obtained. Our results showed that the system proved to be a viable alternative for the treatment of urban wastewater and the recovery of microalgae through the insertion of ozone via Venturi tube combined with tannin-based agent.



中文翻译:

废水处理联合系统:单宁基药剂臭氧混凝溶解气浮收获微藻

摘要

本研究通过由厌氧反应器、微藻培养、文丘里管臭氧再循环、单宁基药剂天然混凝剂混凝/絮凝和溶气浮选 (DAF) 组成的集成系统评估了中试工厂中城市废水处理的性能。评估了臭氧浓度(不含臭氧,0.13 和 0.25 mg O 3 /mg 生物质)和单宁剂量(65、85 和 105 mg/L)关于微藻分离及其对废水处理性能的影响。在实验过程中,证实了当应用臭氧和较高的单宁用量时处理效率提高。使用 0.13 mg O 3可获得最佳结果/mg 的生物质和 105 mg/L 的单宁,获得优异的去除浊度(99.4%)、420 ​​nm 处的表观颜色(94.5%)、TN(83.2%)、N-NH 3(100%)、TOC( 86.8%)、BOD 5 (86.5%) 和 COD (100%)、电导率降低 47.6%、TDS 降低 46.1%、集成系统的 TP 去除率 66.4% 和微藻生物质回收率 84%。我们的研究结果表明,该系统被证明是一种可行的替代方案,可通过文丘里管插入臭氧和单宁基试剂来处理城市废水和回收微藻。

更新日期:2020-10-06
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