A review of measurement methods for peracetic acid (PAA)

• Physical and chemical properties and application of peracetic acid solution. • Determination method of high concentration peracetic acid. • Determination method of residual peracetic acid (low concentration). Peroxyacetic acid has been widely used in food, medical, and synthetic chemical fields for the past several decades. Recently, peroxyacetic acid has gradually become an effective alternative disinfectant in wastewater disinfection and has strong redox capacity for removing micro-pollutants from drinking water. However, commercial peroxyacetic acid solutions are primarily multi-component mixtures of peroxyacetic acid, acetic acid, hydrogen peroxide, and water. During the process of water treatment, peroxyacetic acid and hydrogen peroxide (H₂O₂) often coexist, which limits further investigation on the properties of peroxyacetic acid. Therefore, analytical methods need to achieve a certain level of selectivity, particularly when peroxyacetic acid and hydrogen peroxide coexist. This review summarizes the measurement and detection methods of peroxyacetic acid, comparing the principle, adaptability, and relative merits of these methods.     

The influence on carbon,nitrogen recycling,and greenhouse gas emissions under different C/N ratios by black soldier fly

Environmental Science and Pollution Research - Currently, sustainable utilization, including recycling and valorization, is becoming increasingly popular in waste management. Black soldier fly...     

N2 fixation in urbanization area rivers: spatial-temporal variations and influencing factors

Environmental Science and Pollution Research - While nitrogen (N2) fixation is an important process in nitrogen (N) biogeochemical cycling, supplying a significant portion of the N in natural...     

NOx attenuation in flue gas by •OH/SO4•--based advanced oxidation processes

Environmental Science and Pollution Research - The combustion of fossil fuels has resulted in rapidly increasing emissions of nitrogen oxide (NOx), which has caused serious human health and...     

Functional wastepaper-montmorillonite composite aerogel for Cd2+ adsorption

Environmental Science and Pollution Research - In this study, a composite aerogel (WP-MMT) composed of wastepaper (WP) and montmorillonite (MMT) was prepared by ambient pressure drying technology...     

Soil labile and recalcitrant carbon and nitrogen dynamics in relation to functional vegetation groups along precipitation gradients in secondary grasslands of South China

Environmental Science and Pollution Research - Soil labile and recalcitrant carbon (C) and nitrogen (N) are strongly controlled by plant inputs and climatic conditions. However, the interrelation...     

饱和粉末活性炭电化学再生研究

采用电化学再生法对吸附处理染料废水产生的饱和粉末活性炭(PAC)进行再生,以NaCl为电解质,考察了电源类型、pH、再生时间、电压和NaCl浓度对活性炭再生率的影响,并对活性炭表面酸性含氧官能团进行测定。结果表明:(1)在pH=1、直流电压为6V、NaCl为6g/L、再生90min的最佳条件下,采用单室反应器,饱和PAC再生率达到59.09%。(2)电极循环伏安曲线结果表明,饱和PAC电极表面发生氧化反应,与主电极直接和间接氧化共同作用,使活性炭表面吸附的污染物降解。活性炭表面酸性含氧官能团滴定和红外光谱测试结果进一步表明,电化学再生法使活性炭表面基团得到恢复。     

喀斯特生态环境治理下土壤保持功能对石漠化的响应机制

喀斯特地区土壤保持功能是衡量石漠化生态治理成效的重要手段之一,基于InVEST模型,利用"3S"技术对2005、2010、2015年的关岭-贞丰花江示范区的石漠化进行解译,研究石漠化与土壤保持量两者的响应机制。结果表明:(1)2005～2015年石漠化程度总体减缓,面积由3 773.56 hm~2减少至3 474.23 hm~2,土壤保持总量相继上升,从29.29万t提高至37.29万t,2005～2010年单位面积土壤保持增量集中在6～30 t·hm~(-2)·a~(-1),后五年增量在0～6 t·hm~(-2)·a~(-1)。(2)由于土地利用方式、坡度、土层厚度等差异,土壤保持功能并未呈现简单式下降,而是表现为强度中度、轻度潜在、非喀斯特无石漠化。其中轻度与潜在差值最大,可达5.53 t·hm~(-2)·a~(-1),说明了潜在石漠化是今后治理的重点。(3)2005～2010年石漠化恢复型土壤保持增量为10.27 t·hm~(-2)·a~(-1),由于土地利用方式的转变以及治理时效性在2010～2015年降低为3.01 t·hm~(-2)·a~(-1)。稳定型石漠化变化土壤保持变化最为平稳,强度石漠化减缓区土壤保持功能上升快,轻度最为平缓,表明了治理期长且需循序渐进。因而,在治理过程中需考虑不同等级石漠化具有的土壤保持功能特性及其恢复的时效性。     

面向县域尺度SDG 15.1.2的生物多样性重要区域遥感识别和量化评估——以德清县为例

联合国2030年可持续发展目标(SDG)中指标15.1.2由于元数据的尺度和可用性的问题,无法有效应用于县域尺度的评估。针对这一问题,利用遥感的数据及相关模型,基于县域尺度指标计算的考虑,从生物多样性的内涵出发,构建了一套生物多样性遥感评估指标体系,成功识别了案例区域生物多样性重要场地,实现了县域尺度SDG 15.1.2的量化计算。结果表明,研究区德清县在SDG 15.1.2实施情况良好,构造的生物多样性指数能够有效地监测县域尺度生物多样性状况及其变化。研究为SDG 15.1.2的评估提供了一种可操作的有效方法,为基层行政区域实现可持续发展的规划提供精准的参考信息。     

浅埋富含水砂层盾构下穿敏感性建筑水平冻结+短钢箱接收技术∗

盾构始发与接收是盾构法隧道施工的关键风险点,以常州地铁1号线一期工程博爱路站-常州火车站区间下行线盾构接收工程为例,隧道下穿常州火车站站厅,隧道顶部距地下大厅结构底板仅3.75 m,受地面条件限制采用水平冻结加固方式。通过对冻结温度场、卸压孔压力及车站底板隆起进行跟踪监测与分析,结果表明:受地下水影响温度下降缓慢,车站底板因冻胀隆起较大,最大隆起处位于隧道端头中心线处约为46 mm,且底板隆起值与测点温度的变化密切相关;为防止温度低引起冻胀过大造成上部结构破坏,采取在冻结壁外围适度卸水进行卸压措施;在冻结壁交圈但厚度尚未完全达到冻结设计要求情况下,提出加装短钢箱装置进行盾构接收。实践表明,适度卸压水平冻结+加装短钢箱接收方式密封止水效果良好,安全可靠,可为今后类似工程提供可行技术。