利用富钙粉煤灰形成羟基磷灰石回收公厕压滤滤液中的磷

IF 5.4 Q1 ENVIRONMENTAL SCIENCES
Peidong Su , Qianqian Huo , Junke Zhang , Guifeng Zhao , Bingxu Quan , Chunhui Zhang
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引用次数: 1

摘要

羟基磷灰石(HAP)沉淀被认为是最有前途的磷回收方法之一,尽管它通常需要对局部pH、Ca2+和PO43−的浓度进行复杂的控制,以将副作用降至最低。在许多情况下,需要额外的Ca源来调节溶液的pH和Ca浓度,这使得HAP沉淀过程的成本相对较高。在此,我们研究了使用富钙粉煤灰(CFA)作为钙源和pH调节剂的可能性,为从抽水马桶滤液中沉淀HAP提供合适的环境。确定了影响HAP形成的主要因素,并考察了CFA从真正的抽水马桶滤液中回收磷的性能,提出了其机理。结果表明,CFA的强缓冲性能使其在5-12的宽pH范围内工作。产物表征和Visual MINTEQ模拟分析表明,CFA对PO43−的去除主要是通过HAP的形成。此外,CFA对抽水马桶滤液中PO43−的去除结果表明,当CFA浓度为4g/L时,PO4-P的去除率达到87.0%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Recovery of phosphorus from public toilet press filtrate using Ca-rich fly ash through the formation of hydroxyapatite (HAP)

Recovery of phosphorus from public toilet press filtrate using Ca-rich fly ash through the formation of hydroxyapatite (HAP)

Hydroxyapatite (HAP) precipitation is considered to be one of the most promising approaches for phosphorus recovery, though it often requires sophisticated control of local pH, the concentration of Ca2+ and PO43− to minimize the side effects. In many cases, additional Ca sources are needed to adjust the pH and Ca concentration of the solution, that makes the cost of HAP precipitation process relatively high. Herein, we studied the possibility of using Ca-rich fly ash (CFA) as Ca sources and pH adjuster to provide suitable environment for HAP precipitation from the toilet press filtrate. The main factors that affect the HAP formation were identified and the performance of CFA on P recovery from real toilet press filtrate was examined and the mechanism was proposed. Rsults indicated that the strong buffering property of CFA rendered it workable in a wide pH range from 5 to 12. Products characterization and Visual MINTEQ simulative analysis illustrated that the removal of PO43− by CFA was mainly through the formation of HAP. Moreover, the results of PO43− removal by CFA in toilet press filtrate proved that when the concentration of CFA was 4 g/L, the removal rate of PO4-P reached 87.0%.

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来源期刊
Resources, conservation & recycling advances
Resources, conservation & recycling advances Environmental Science (General)
CiteScore
11.70
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76 days
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