Saline alkali water desalination project in Southern Xinjiang of China: A review of desalination planning, desalination schemes and economic analysis

Fang, Shibiao; Tu, Wenrong; Mu, Lin; Sun, Zhigang; Hu, Qiuyue; Yang, Yang

doi:10.1016/j.rser.2019.109268

Cited by 49 publications

(17 citation statements)

References 44 publications

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“…The saline-alkali soil improvement has always been a hot and difficult issue concerned by related experts worldwide (Sahin et al 2011;Zheng et al 2017). In Xinjiang arid region, the saline-alkali land is mainly distributed in oasis areas, accounting for approximately 1/3 of the total salinealkali land area in China (Casas et al 2019;Fang et al 2019). There is a great practical significance to developing and utilizing the saline-alkali land reasonably, promoting regional development and sticking to the minimum cultivated land area of China.…”

Section: Introductionmentioning

confidence: 99%

Soil salinity variations and cotton growth under long-term mulched drip irrigation in saline-alkali land of arid oasis

Wang

Zhang

et al. 2021

Irrig Sci

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The sustainable development and utilization of saline-alkali land are closely related to holding fast the minimum cultivated land area of China. The change of soil salt in cotton field under long-term mulched drip irrigation (MDI) is connected with the development of the national cotton industry. From 2015 to 2019, five cotton fields with different applying years of MDI, which were reclaimed in 2004, 2008, 2010, 2012 and 2015 respectively and were saline-alkali wasteland before, were monitored continuously in the Manas River irrigation area of Xinjiang. By means of continuous location monitoring and spatial–temporal variability (For example, the monitoring data of cotton fields under MDI in 2004, 2008, 2010, 2012 and 2015, and in the year of 2015 were counted as 12, 8, 6, 4 and 1 years, respectively), the spatial–temporal variations of soil salt and ions in cotton field with 1-16a MDI technology were presented. The cotton growth characteristics and its main influencing factors were also analyzed in the study. The results showed that saline-alkali cotton field experienced changed from intensive saline soil to moderate saline soil and finally to non-saline soil under long-term MDI. The change of soil salt and the response of cotton growth to soil salt were divided into three typical stages. Firstly, soil desalinated rapidly in 1-4a MDI cotton field, which the annual average desalination rate was 24.93% in 0–100 cm soil layer (root zone). Additionally, the survival rate of cotton rocketed from 1.48% to 42.04%, and yield increased sharply from 72.43 kg ha−1 to 3075.90 kg ha−1. Soil desalination was lower in 5-11a MDI cotton field, which the annual average desalination rate was 10.92% at the root zone. The annual survival rate and yield of cotton increased by 6.26% and 5.18%, respectively. After 12a MDI, the soil salt in cotton field tended to be generally constant, which the average salt content in root zone was less than 2.49 g kg−1. The survival rate of cotton was stable above 90.39%, and the yield per unit area exceeded 5401.32 kg ha−1. Ions, sodium absorption ratio and Cl− and SO42− equivalent ratio (CSER) in cotton soil also decreased with the extension of MDI. Salt composition changed year by year, but the type of intensive saline soil had always been chloride-sulphate solonchak (0.2 < CSER < 1). In practice, with a higher irrigation quota and ideal irrigation water quality, the soil salt environment of saline-alkali soil MDI cotton field had developed in favor of cotton growth in an oasis irrigation area. However, this management practice caused between 124.21–143.61 mm of water resources waste. Therefore, we should further enhanced the consciousness of water-saving and implemented quota management in practice.

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Section: Introductionmentioning

confidence: 99%

Soil salinity variations and cotton growth under long-term mulched drip irrigation in saline-alkali land of arid oasis

Wang

Zhang

et al. 2021

Irrig Sci

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“…According to the research results of Fang et al (2019), it is possible to predict the water production of the solar still of FSS and DSS in Hangzhou during one year (only considering the sunny days), as shown in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

“…With the development of economy and the growth of population in the world, the demand for potable water is increasing gradually. About one fifth of the world's population lives in water deficient areas (Fang et al 2019). As such, desalination of salty water has been considered to be the best method to solve the issue of shortage of fresh water in arid areas or countries (Fang et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a solar water treatment device with dome structure cover in winter: performance evaluation and comparative analysis

Sun

Fang

2021

Water Supply

Self Cite

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In this paper, a dome slope single basin solar still for water treatment and desalination is presented. This new solar still device is based on installing a dome slope cover on the walls of the solar still. The main objective of such still is to concentrate more sunrays at the still's bottom basin, through the increased area of dome glass cover. Experiments are conducted under the climate conditions in Hangzhou city, China, for testing the operational performance of dome slope type solar still and the fourfold slope still, so as to make a comparative analysis between them. Assessment of the dome slope still's feasibility is performed based on energy, exergy, exergoeconomic, and enviroeconomic methodologies, as well as energy payback time. Results show that the productivity of dome slope still is 36% higher than that of fourfold slope still, and dome slope solar still enhances the average hourly energy efficiency by 34%. Due to the higher energy and exergy outputs of dome slope solar still throughout its lifetime, the novel solar still proposed in this study mitigates more CO2 compared to the fourfold slope still. Overall, incorporation dome slope cover with the still is found promising in terms of freshwater yield, cost, and energy payback time compared to conventional one. The dome slope single basin solar still appears to be effective from exergoeconomic, exergoenvironmental parameters analysis.

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“…Sustainable and efficient utilization of saline-alkaline soils is a critical step toward increasing the amount of arable land and its agricultural production capacity, protecting food security in many parts of the world, including maintaining a minimum of 1.8 billion acres of crop production in China [1]. The saline-alkaline soil area in Xinjiang is 1.23 × 10 6 ha, which accounts for nearly one third of total saline-alkaline soil in China [2,3]. Most salinealkaline soil in Xinjiang distributed in oases.…”

Section: Introductionmentioning

confidence: 99%

Variations of Soil Salinity and Cotton Growth under Six-Years Mulched Drip Irrigation

Wang

Zhang

et al. 2021

Agronomy

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The lowering of salt content in the field, especially in arid areas, after consecutive application of mulched drip irrigation (MDI) is of vital importance for sustainable cotton plantation. To elucidate the effects of long-term MDI on soil properties and cotton growth, this paper systematically monitored the soil salinity, ion concentrations and the yield of cotton in the field using MDI consecutively for six years in a typical oasis in Xinjiang, China. The results showed that MDI could significantly change salt distribution in the cotton field. During the six years tested, the soil salt content using MDI declined fast at first, and then the decline rate gradually decreased. In the 1st and 2nd year, the average salt content within 0–100 cm soil layer was larger than 20 g kg−1, which belonging to the saline soil. Then the salt content decreased to 10–20 g kg−1 in the 3rd and 4th year, and the cotton field declined to heavily saline soil. After 5 years of MDI, the soil turned to non-salinized. The Cl− and SO42− equivalence ratio (CSER) also decreased with the increase of application years of MDI. Saline-alkaline land developed from chloride-sulphate solonchak (0.2 < CSER < 1) into sulphate solonchak (CSER < 0.2) after 6 years of MDI. The survival rate of the cotton increased from 1.48% (1 year of MDI) to 76.3% (6 years of MDI), and the yield increased from 72.43 kg ha−1 to 4515.48 kg ha−1. When the average CSER, SAR and the soil salinity in 0–140 cm soil layer decreased to 0.60, 0.98 (mol kg−1)0.5 and 6.25 g kg−1, farmers can achieve a balance between income and expenditure. Moreover, when CSER, SAR, and the soil salinity continuously decreased to 0.44, 0.69 (mol kg−1)0.5 and 0.77 g kg−1, the cotton yield will exceed the average production level of cotton in Xinjiang. Under the current irrigation schedule in the oasis irrigation area, the soil salinity and groundwater level after applying MDI could be conducive to cotton growth. However, this situation had also caused a waste of nearly 200 mm of water resources. Therefore, authors suggested that further research on water-saving irrigation systems suitable for different soil conditions should be carried out, and also the differential quota management in production practice should be adopted.

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Saline alkali water desalination project in Southern Xinjiang of China: A review of desalination planning, desalination schemes and economic analysis

Cited by 49 publications

References 44 publications

Soil salinity variations and cotton growth under long-term mulched drip irrigation in saline-alkali land of arid oasis

Soil salinity variations and cotton growth under long-term mulched drip irrigation in saline-alkali land of arid oasis

Experimental study of a solar water treatment device with dome structure cover in winter: performance evaluation and comparative analysis

Variations of Soil Salinity and Cotton Growth under Six-Years Mulched Drip Irrigation

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