Low concentrations of Cu2+ in synthetic nutrient containing wastewater inhibit MgCO3-to-struvite transformation,Environmental Science: Water Research & Technology

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Low concentrations of Cu2+ in synthetic nutrient containing wastewater inhibit MgCO3-to-struvite transformation
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-12-29 , DOI: 10.1039/d0ew01035a
Karolina Barčauskaitė _{1,

2,

3,

4,

5} , Donata Drapanauskaitė _{1,

2,

3,

4,

5} , Manoj Silva _{1,

2,

3,

4} , Vadim Murzin _{6,

7,

8,

9,

10} , Modupe Doyeni _{5,

11,

12} , Marius Urbonavicius _{12,

13,

14,

15} , Clinton F. Williams _{4,

16,

17,

18} , Skaidrė Supronienė _{5,

11,

12} , Jonas Baltrusaitis _{1,

2,

3,

4}

Affiliation

Department of Chemical and Biomolecular Engineering
Lehigh University
Bethlehem
USA
Lithuanian Research Centre for Agriculture and Forestry
Bergische Universität Wuppertal
Wuppertal
Germany
Deutsches Elektronen Synchrotron DESY
D-22607 Hamburg
Kedainiai District
Lithuania
Center for Hydrogen Energy Technologies
Lithuanian Energy Institute
44403 Kaunas
USDA-ARS
US Arid Land Agricultural Research Center
Maricopa

Simultaneous major nutrient nitrogen (N) and phosphorus (P) recovery from wastewater is key to achieving food–energy–water sustainable development. In this work, we elucidate the reaction kinetics, crystalline structure and chemical composition of the resulting solid precipitate obtained from simulated N and P containing wastewater solution using widely abundant low solubility magnesite (MgCO₃) particles in the presence of common transition metal ions, such as zinc (Zn²⁺) or copper (Cu²⁺). We show that up to 100 ppm Zn²⁺ from the simulated wastewater can be incorporated into the struvite lattice as isolated distorted Zn²⁺ while even at very low concentrations of ∼5 ppm Cu²⁺ ions almost completely inhibit struvite crystal formation. The resulting solid precipitate distinctly affects soil microbial biomass carbon and soil dehydrogenase enzyme activity. These results show a cautionary case where abundant natural mineral MgCO₃ exhibits very different chemistry in Cu²⁺ containing simulated wastewater and does not readily adsorb or retain NH₄⁺ and PO₄³⁻ ions, unlike less sustainable but more water-soluble magnesium sources, such as MgCl₂, at the equivalent [Mg²⁺] : [NH₄⁺] : [PO₄³⁻] molar ratio of 1.4 : 1 : 1.

中文翻译：

含合成营养物的废水中低浓度的Cu2 +抑制了MgCO3-向鸟粪石的转化

从废水中同时回收主要养分氮和磷是实现食品，能源，水可持续发展的关键。在这项工作中，我们阐明了在常见的过渡金属离子存在下，使用广泛丰富的低溶解度菱镁矿（MgCO ₃）颗粒，从含氮和磷的模拟废水溶液中获得的固体沉淀物的反应动力学，晶体结构和化学组成，作为锌（Zn ²⁺）或铜（Cu ²⁺）。我们表明，模拟废水中高达100 ppm的Zn ²⁺可以作为孤立的扭曲Zn ²⁺掺入鸟粪石晶格中，即使浓度仅为〜5 ppm的非常低的Cu ²⁺离子几乎完全抑制鸟粪石晶体的形成。产生的固体沉淀物明显影响土壤微生物生物量碳和土壤脱氢酶活性。这些结果表明，在含铜²⁺的模拟废水中，丰富的天然矿物MgCO ₃表现出非常不同的化学性质，并且不容易吸收或保留NH ₄⁺和PO ₄^3-离子，这与可持续性较差但水溶性较大的镁源不同，这是一个谨慎的情况。如氯化镁₂，在等效[镁²⁺ ]：[NH ₄⁺ ]：[PO ₄^3- ]的1.4摩尔比：1：1。

更新日期：2021-01-22

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