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A Case Study of Dye Intermediate Production Wastewater Treatment Project
Qinyi Sun,
Kai Ning,
Qingqing Qiu,
Ruoxuan Huang,
Chenxi Deng,
Hongze Qian,
Ting Wu,
Hansong Chen
Issue:
Volume 8, Issue 1, March 2022
Pages:
1-6
Received:
27 December 2021
Accepted:
15 January 2022
Published:
24 January 2022
Abstract: Dye intermediates are indispensable chemical raw materials and play an important role in global industrial production. In the production process of dye intermediates, a large amount of wastewater is produced, which will cause serious pollution to the environment, and ultimately harm human health. Dye intermediate production wastewater is characterized by high organic matter concentration, complicated pollutants and poor biodegradability. The traditional treatment process has limited ability to purify wastewater and can not effectively degrade the organic pollutants. In this project, a novel combined process of "ozone catalytic oxidation + biochemical degradation" was adopted to treat the dye intermediate production wastewater, and the process mechanism and treatment effect were analyzed. The results showed that the key process unit of this project was heterogeneous ozone catalytic oxidation. Due to the high activity, low cost, easy recovery and strong adsorption capacity of heterogeneous ozone catalysts, a large amount of organic matters in wastewater could be adsorbed on the surface to improve the treatment effect. Through the oxidation process, the biodegradability of wastewater was improved to facilitate subsequent advanced treatment. Ultimately, the effluent water quality could meet the three-level limit requirements in the "Integrated Wastewater Discharge Standard" (GB8978-1996), with the water index as follows: CODcr≤450 mg/L, BOD5≤200 mg/L, SS≤200 mg/L, chromatic value≤32 times. This operational process was manifested to be economical and reliable, possessing a broad development prospect in wastewater treatment of dye intermediates related industries.
Abstract: Dye intermediates are indispensable chemical raw materials and play an important role in global industrial production. In the production process of dye intermediates, a large amount of wastewater is produced, which will cause serious pollution to the environment, and ultimately harm human health. Dye intermediate production wastewater is characteri...
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Groundwater Recharge Assessment Using WetSpass and MODFLOW Coupling: The Case of Hormat-Golina Sub-basin, Northern Ethiopia
Seyoum Bezabih,
Taye Alemayehu
Issue:
Volume 8, Issue 1, March 2022
Pages:
7-20
Received:
21 December 2021
Accepted:
11 January 2022
Published:
29 March 2022
Abstract: Water scarcity in northern Ethiopia, as well as its socio-economic relevance in terms of water demand for agriculture and domestic use, are at the root of the search for new groundwater resources and the development of groundwater models that can be used to control and manage the resource. The groundwater recharge of the Hormat-Golina sub basin was assessed using WetSpass-MODFLOW coupling. The goal of this paper is to assess the groundwater recharge in the Hormat-Golina sub-basin. These findings are then used to simulate the hydraulic head distribution using the MODFLOW groundwater flow simulation model. By comparing measured and simulated hydraulic heads, the steady state groundwater flow calibration was obtained. WetSpass calculated the mean annual evapotranspiration, surface runoff, and groundwater recharge to be 516.6, 204.9, and 35.6 mm, respectively. Groundwater recharge accounted for 4.7% of precipitation, while actual evapotranspiration and surface runoff accounted for 27% and 68% of precipitation, respectively. In such seasonal variations, the groundwater head distribution is 9.37 to 29.86 m in the winter (dry season), 9.53 to 29.89 m in the summer (wet season), and 9.58 to 30.17 m in the annual stress periods (recharges). For all stress periods, the estimated hydraulic heads in steady state fit well with the measured ones, with a correlation coefficient of 0.86 (summer, winter, and annual recharge). To preserve the resource's long-term viability, the balance between groundwater recharge and projected abstraction rates for agriculture and domestic water supply must be considered in future groundwater resource development plans in the valley.
Abstract: Water scarcity in northern Ethiopia, as well as its socio-economic relevance in terms of water demand for agriculture and domestic use, are at the root of the search for new groundwater resources and the development of groundwater models that can be used to control and manage the resource. The groundwater recharge of the Hormat-Golina sub basin was...
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GIS-Based Assessment of Suitability Area of Rainwater Harvesting in Daro Labu District, Oromia, Ethiopia
Bayissa Muleta,
Teshome Seyoum,
Shimelis Assefa
Issue:
Volume 8, Issue 1, March 2022
Pages:
21-35
Received:
21 February 2022
Accepted:
24 March 2022
Published:
31 March 2022
Abstract: Rainwater harvesting is the process of intercepting, conveying and storing rainfall for future use as an alternative source of water in the drought prone areas of Ethiopia especially eastern Oromia. The aim of the research was to assess and mapping suitability area of water harvesting site in Daro Labu District. There are various methodologies and criteria to identify suitable sites and techniques for rainwater harvesting (RWH). Determining the best method or guidelines for site selection, however, is difficult. GIS is the recent technology of spatiotemporal data used to assess the factor of influences for rainfall and runoff depth estimation for identification of potential area of RWH for crop production and mapping of the potential site. The influence factors for consideration of the assessment was climate data, soil texture and depth, land use and land cover (LULC) type, slope difference were used. The total area of the catchment was about 156064.72 ha. The SCS–CN for rainfall used to runoff depth estimation compute runoff and volume from the land surface depend on the level of antecedent moisture condition (AMC.) The length of wet and dry season of the study area were known with antecedent moisture condition (AMC) of II, I III by having the values of 82, 67 and 91 respectively. The annual of 20 years average rainfall was 925.2 mm with maximum and minimum of 1134 mm and 737.3 mm respectively with average annual runoff depth of estimate was 185.3 mm. From the estimated annual runoff the volume of water harvested was about 2.89 × 108 m3. The suitability map of the study area shows extremely potential, highly potential, potential and not potential accounts by coverage areas about (12,797.3 ha) 8.2%, (25,906.7 ha) 16.6%, (98,302.8 ha) 63.5%, and (19,040 ha) 7.5% respectively. The runoff in the study area was affected by geomorphological factors, particularly, land use change, topography, soil texture and depth, drainage density, and population density affects the runoff rate and volume significantly.
Abstract: Rainwater harvesting is the process of intercepting, conveying and storing rainfall for future use as an alternative source of water in the drought prone areas of Ethiopia especially eastern Oromia. The aim of the research was to assess and mapping suitability area of water harvesting site in Daro Labu District. There are various methodologies and ...
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