Water management in a controlled ecological life support system during a 4-person-180-day integrated experiment: Configuration and performance

Zhang, Liangchang; Li, Ting; Ai, Weidang; Zhang, Chunyan; Tang, Yongkang; Yu, Qihui; Li, Yinghui

doi:10.1016/j.scitotenv.2018.10.080

Cited by 14 publications

(3 citation statements)

References 18 publications

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“…However, this limitation of aeration pressure threshold would not be a drawback when the bulk liquid should be anoxic, in which dissolved oxygen level had to be kept low so nitrate as electron acceptors would be favored, and low aeration pressure also indicated lower energy consumption. In this study, early planetary base (EPB) wastewater used in a controlled ecological life support system experiment with four crew members [20] was treated with MABR. The EPB wastewater contained hygiene wastewater and 10 vol% of urine, and the short-term goal for this study was to achieve 50% of nitrogen removal and 90% of total organic carbon (TOC) removal.…”

Section: Introductionmentioning

confidence: 99%

Green and Sustainable Treatment of Urine Wastewater with a Membrane-Aerated Biofilm Reactor for Space Applications

Zhan

Zhang

et al. 2022

Water

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Sustainability has been a concern of survival for future long-term manned space missions. Therefore, the wastewater generated by the crew members, containing urine and hygiene wastewater, should be treated with appropriate biological processes to promote recycling efficiency. In this study, we developed a membrane-aerated biofilm reactor (MABR) that could achieve up to 96% total organic carbon (TOC) removal efficiency and up to 82% denitrification efficiency for an influent with 370–390 mg/L TOC and 500–600 mg/L total nitrogen (TN) without additional carbon source or sludge discharge. The nitrogen removal rate was about 100 mg N L−1 d−1. Metagenomic analysis indicated the presence of a variety of nitrifying, denitrifying, and anammox bacteria in the microbial community and existence of functional genes in nitrification, denitrification, and anammox pathways.

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Section: Introductionmentioning

confidence: 99%

Green and Sustainable Treatment of Urine Wastewater with a Membrane-Aerated Biofilm Reactor for Space Applications

Zhan

Zhang

et al. 2022

Water

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“…The methods of evaluating plant landscape communities mainly include LCJ method, BIB-LCJ method and BIB-LCJ method. LCJ is a relatively reliable and direct evaluation method, but it requires a lot of manpower, materials and time, and it is difficult to operate in practice (Zhang et al, 2019). Very large, the degree of aesthetic evaluation is reliable, feasible and simple, and the scoring results are not significantly different from the other two methods, and are highly praised by domestic and foreign experts.…”

Section: Beauty Evaluation Methodsmentioning

confidence: 99%

Research on the method of landscape configuration of garden plants based on the evaluation method of beauty degree

Liu

Wang

et al. 2022

IJETM

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In order to overcome the problems of low accuracy in the analysis of beauty value, contribution degree and colour coordination in the process of landscape plant configuration, a new landscape plant configuration method based on the beauty evaluation method is proposed in this paper. The method uses the beauty evaluation method to evaluate 60 pilot garden plant landscapes and establishes the mathematical model of beauty by regression analysis to analyse the main factors of colour configuration. The landscape configuration X. Liu et al.degree model of landscape plants was established. The objective is to explore the influence of different colour factors on the landscape configuration of garden plants. The experimental results show that the average beauty value of the study area is 0.7798 ~ 0.9761, and the comprehensive contribution can reach 67.9%, which can effectively improve the landscape configuration level of garden plants and the accuracy of colour coordination analysis.

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“…Water recovery from urine is inevitable in extreme environments such as long-term, manned space exploration [1][2][3]. Although some technologies have been utilized in the International Space Station (ISS), novel approaches are still desired due to the suboptimal water recovery rate and the poor reliability of the established technologies [4].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Water Recovery from Urine by Vacuum Membrane Distillation for Space Applications: Water Quality Improvement and Operation Stability

Wang

Liu

et al. 2022

Membranes

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Water recovery by membrane distillation (MD) is an attractive alternative to existing urine treatment systems because it could improve the water recovery rate and reliability in space missions. However, there are few studies of urine MD, particularly on the removal of the remaining contaminants from distillate water and the assessment of its long-term performance. In this study, the influences of various operation parameters on distillate water quality and operation stability were investigated in batch mode. The low pH of feedstock reduced the conductivity and total ammonium nitrogen (TAN) in distillate water because the low pH promoted the ionization of ammonia to ammonium ions. However, the low pH also facilitated the formation of free chlorine hydride, which resulted in the minor deterioration of the conductivity in the distillate due to the increasing volatility of chlorine hydride in the feedstock. Thirty batches of vacuum membrane distillation (VMD) experiments demonstrated that the permeate flux and the distillate water quality slightly decreased due to the small range of membrane wetting but still maintained an over 94.2% and 95.8% removal efficiency of the total organic carbon (TOC) and TAN, and the conductivity was <125 μs cm−1 in the distillate water after 30 test batches. VMD is a feasible option for urine treatment in space missions.

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Water management in a controlled ecological life support system during a 4-person-180-day integrated experiment: Configuration and performance

Cited by 14 publications

References 18 publications

Green and Sustainable Treatment of Urine Wastewater with a Membrane-Aerated Biofilm Reactor for Space Applications

Green and Sustainable Treatment of Urine Wastewater with a Membrane-Aerated Biofilm Reactor for Space Applications

Research on the method of landscape configuration of garden plants based on the evaluation method of beauty degree

High-Efficiency Water Recovery from Urine by Vacuum Membrane Distillation for Space Applications: Water Quality Improvement and Operation Stability

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