Experimental Study on a Closed-Cycle Humidification and Dehumidification System for Treating Wastewater Containing High Concentrations of Inorganic Salts and Organic Matter

Jun Liu,Sanjiang Yv,Yong Sun,Jiaquan Wang,Kaixuan Hu

doi:10.3390/pr9040671

Jun Liu, Sanjiang Yv + Show 3 more

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https://doi.org/10.3390/pr9040671

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Journal: Processes	Publication Date: Apr 11, 2021
Citations: 7	License type: CC BY 4.0

Affiliation: Hefei University of Technology

Abstract

Industrial wastewater contains high concentrations of inorganic salts and organic matter. This experiment studied a system for treating wastewater containing high concentrations of inorganic salts and organic matter. The setup consists of a closed-cycle humidification and dehumidification system and a filter press. Chemical wastewater was used as the treatment solution, and the treatment performance of the system was tested and analyzed. The system effectively reduced the chemical oxygen demand (COD), electric conductivity (EC), total nitrogen (TN), and ammonia nitrogen (NH4-N) in the wastewater and, at the same time, dehydrated sludge was obtained through a filter press. The system maintains a stable removal rate of each index (COD, EC, TN, and NH4-N) in wastewater and can remove inorganic salts and organic matter from wastewater. The system can successfully treat industrial wastewater containing high concentrations of inorganic salts and organic matter.

Highlights

With the development of society and industrial progress, a large amount of industrial wastewater is produced, which creates significant challenges for the environment and greatly deteriorates environmental quality [1]
The results show that purple phototrophic bacteria can treat wastewater containing high concentrations of NaCl
The results showed that the evaporation system’s energy consumption is often less sensitive to salinity changes than reverse osmosis, but the energy required for separation changes significantly with salinity

Summary

Introduction

With the development of society and industrial progress, a large amount of industrial wastewater is produced, which creates significant challenges for the environment and greatly deteriorates environmental quality [1]. The chemical industry consumes a lot of water, and if the wastewater produced is not effectively treated, it causes serious harm to the environment. [1] Wastewater cannot be directly released into the environment and needs to be treated first [2]. Industrial wastewater containing high concentrations of inorganic salts and organic substances cannot directly enter the urban wastewater pipe network or be reused for production, so certain pre-treatments are required. Current wastewater treatment methods include reverse osmosis (RO) [3], nanofiltration (NF) [4], electrodialysis [5], microbial treatment [6], multi-effect evaporation [7], and mechanical vapor recompression (MVR) [8]. Tim et al [11]

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