Low-cost coal-based adsorbents for the removal of high concentrated ammonia nitrogen from real coking wastewater: Aiming at industrial application

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2024-10-21 DOI:10.1016/j.jtice.2024.105798

Hui Zhang , Yueli Wen , Bin Wang , Wenrui Hua , Wei Huang

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Abstract

Background

The removal of high-concentrated ammonia nitrogen (AN) from the real coking wastewater (CW) is a tough nut to crack for coking industry. Coal-gangue, a solid waste, troubles the world, too. From the perspective of treat waste with waste, a promising coal-gangue-based adsorbent BY-N1, was developed to treat high-concentrated real CW and show excellent regenerability and removal rate (RR). This work hopefully broadens a new horizon for the development of waste-based adsorbent for removing AN in industrial application.

Methods

BY-N1 was prepared from coal-gangue by simple solvent treatment and calcination. The effects of the adsorbent dosage, pH, initial concentration and reusability were investigated. Based on the adsorption isotherms, kinetics and thermodynamics, the adsorption mechanism was proposed.

Significant findings

BY-N1 exhibits the potential in industry application, with the best ammonia nitrogen removal rate (ANRR) of 40.53 % for the complex real CW (about 3000 mg/L) in 20 mins and promising regenerability. Chemical adsorption dominant the adsorption process, the quasi-second-order model and Freundlich isotherm fit the adsorption process better, the maximum saturated adsorption capacity of BY-N1 is 240 mg g^-1. This is a spontaneous and endothermic process by thermodynamic analysis, which involves the crucial contribution of complexation, hydrogen bonding interaction, electrostatic adsorption and Vander Waals force.

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用于去除实际焦化废水中高浓度氨氮的低成本煤基吸附剂：面向工业应用

背景从真正的焦化废水（CW）中去除高浓度氨氮（AN）是焦化行业的一个难题。煤矸石作为一种固体废弃物，也是困扰世界的难题。从 "以废治废 "的角度出发，我们开发了一种前景广阔的煤矸石基吸附剂 BY-N1，用于处理高浓度的实际焦化废水，并显示出优异的可再生性和去除率（RR）。方法BY-N1由煤矸石通过简单的溶剂处理和煅烧制备而成。研究了吸附剂用量、pH 值、初始浓度和重复利用率的影响。重要发现BY-N1 在 20 分钟内对复杂实际 CW（约 3000 mg/L）的氨氮去除率（ANRR）达到 40.53 %，并具有良好的可再生性，显示出其在工业上的应用潜力。化学吸附在吸附过程中占主导地位，准二阶模型和 Freundlich 等温线较好地拟合了吸附过程，BY-N1 的最大饱和吸附容量为 240 mg g-1。从热力学角度分析，这是一个自发的内热过程，其中络合作用、氢键作用、静电吸附和范德华力的贡献至关重要。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.