scholarly journals A Separation and Desalination Process for Farmland Saline-Alkaline Water

Agriculture ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1001
Author(s):  
Qiaonan Yang ◽  
Can Hu ◽  
Jie Li ◽  
Xiaokang Yi ◽  
Yichuan He ◽  
...  
Keyword(s):  
Irrigation Water ◽  
Removal Rate ◽  
Membrane System ◽  
Total Hardness ◽  
Condensation Process ◽  
Water Recovery ◽  
Alkaline Water ◽  
Ro Membrane ◽  
Filtering Effect ◽  
Hardness Removal

Salination poses serious hazards to farmland soil. For the purpose of solving soil salination, desalination of water sources, and other problems faced by arid areas, a separation and desalination process for farmland saline-alkaline water is proposed; a separation and desalination device based on this process is also presented and tested. Results indicate that water associated with the pretreatment device satisfied the working conditions of the composite nanofiltration (NF)-reverse osmosis (RO) membrane system. The composite NF-RO membrane system produced a better filtering effect than either the NF membrane or the RO membrane. When used for filtering saline-alkaline water, the composite NF-RO membrane system achieved a desalination rate of 96.06%, a total hardness removal rate of 98.93%, and a Cl- removal rate of 99.32%, adhering to the standard for irrigation water quality. The flashing-condensation process realized a fresh water recovery rate greater than 70%. During brine evaporation using solar salt making processes, the primary compound of crystals precipitated was NaCl (with a relative content of 93%), suggesting that the precipitates have the potential values of industrial salts. These findings offer new technical references for solving the problem of farmland irrigation water faced by saline-alkaline areas worldwide.

scholarly journals Performance of a Hybrid ED–NF Membrane System for Water Recovery Improvement via NOM Fouling Control

2021 ◽  
Author(s):  
Soyoon Kum ◽  
Matthew R. Landsman ◽  
Gregory M. Su ◽  
Guillaume Freychet ◽  
Desmond F. Lawler ◽  
...  
Keyword(s):  
Membrane System ◽  
Water Recovery ◽  
Fouling Control

Extending Tertiary Treated Municipal Wastewater as Boiler Feed-Water via a Dual Membrane CUF/RO Process

2013 ◽  
Vol 726-731 ◽  
pp. 2476-2482
Author(s):  
Hai Xia Wang ◽  
Peng Ji
Keyword(s):  
Municipal Wastewater ◽  
Exchange Process ◽  
Feasibility Studies ◽  
Cost Comparison ◽  
Feed Water ◽  
Water Recovery ◽  
Ion Exchange Process ◽  
Ro Membrane ◽  
Treated Municipal Wastewater

The objective of this work is to conduct feasibility studies on water treatment for boiler feeding water use from treated municipal wastewater effluent using a pilot dual continuous ultrafiltration - reverse osmosis (CUF/RO) membrane process with the capacity of 15m3/h. A CUF membrane from HYDRAcap and LFC3-LD RO membrane were used in this study. The CUF unit and RO unit were operated at over 97% and 75-80% water recovery, respectively. The results indicate that CUF process is not only capable of reducing organic and nutrient pollutants but also achieves a silt density index (SDI) less than 2, turbidity of less than 0.47NTU which is suitable for RO treatment. Rejection of the RO unit in terms of average conductivity, COD, hardness, alkaline, NH4+-N, TN, TP were higher than 98.2%, 97.9%, 99.8%, 97.9%, 93.9%, 95.1% and 75%, respectively. Other parameters also can match the quality of high-grade water for use in the boiler industry except pH. Finally, a cost comparison between dual membrane and ion-exchange process showed annual savings of more than 33000000 CNY can be possible.

Application of Photocatalytic Metal Membrane System for Water Purification

2006 ◽  
Vol 326-328 ◽  
pp. 1317-1320 ◽  
Author(s):  
Jong Oh Kim ◽  
Jong Tae Jung ◽  
Won Youl Choi
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Uv Light ◽  
Removal Rate ◽  
Membrane System ◽  
Tio2 Powder ◽  
Metal Membrane ◽  
Tio2 Particles ◽  
Positive Effect

This study was conducted to evaluate the applicability of photocatalytic metal membrane system for the treatment of humic acid and heavy metals in aqueous solution. The catalysts, TiO2 powder P25 Degussa and metal membrane with 0.5 μm nominal pore size were used for experiments. Removal efficiency of humic acid and heavy metals increased with the increase of TiO2 dosage, however decreased over 0.3 g/L of TiO2 dosage. The addition of H2O2 as an oxidation reagent had a positive effect for the removal rate of humic acid and heavy metals. Metal membrane with stainless steel seemed to be quite stable to UV light with oxidation reagent in long-term operational periods over 6 months. Moreover, TiO2 particles can be effectively separated from the treated water by membrane rejection and the permeation flux was also enhanced by the combination of photocatalytic reaction.

Experimental Study on Simultaneous Desulfurization and Denitrification by Ozone Oxidation Combined with Alkaline Wastewater Washing

2014 ◽  
Vol 1010-1012 ◽  
pp. 748-755
Author(s):  
Hua Yin ◽  
Hua Fang Guo
Keyword(s):  
Water Level ◽  
Flue Gas ◽  
Oxidation Rate ◽  
Removal Rate ◽  
No Oxidation ◽  
Molar Ratio ◽  
Gas Temperature ◽  
Ozone Oxidation ◽  
Alkaline Water ◽  
Water Rate

It is important to develop low cost and efficient technique for simultaneous removal of SO2and NOXfrom flue gas. In this paper, ozone oxidation and alkaline wastewater washing process was employed for flue gas desulfurization and denitrification in a 75t/h coal-fired boiler. In order to optimize the operation parameters for SO2and NOXremoval, the influence of several parameters, such as molar ratio of [O3]/[NO] and flue gas temperature on the oxidation rate of NO, oxidation rate of NO, alkaline water level in aeration tank, alkaline water rate and mole ratio of [NaOH/ (SO2+NOx)] on the removal efficiency of SO2and NOXhave been studied. The experimental results showed that molar ratio of [O3]/[NO] had limited effect on the oxidation of SO2, while NO oxidation efficiency improved with the increase of [O3/NO] molar ratio and it reached to ~ 90% at molar ratio of [O3]/[NO] = 1.4. Flue gas temperature performed slight influence on the oxidation of NO in the range of 60 to 120 °C, and had adverse impact on the removal of SO2and NOX. NOXremoval rate was enhanced with increasing NO oxidation rate and achieved to a high level at NO oxidization rate of ~50%. Mole ratio of [NaOH/ (SO2+NOx)] had significant impact on the removal rate of NOX, while it showed limited effects on that of SO2. The increase of alkaline aeration water level and alkaline water rate would definitely lead to a higher removal rate for both SO2and NOX. An optimized removal rate of 93.6% for SO2, 77.6% for NOXand 99.1% for dust were obtained under the water level of 20cm and volume of 74.5t/h.

scholarly journals Irrigation groundwater quality based on hydrochemical analysis of Nandgaon block, Nashik district in Maharashtra

2017 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Kailash Aher ◽  
Sharad Gaikwad
Keyword(s):  
Water Quality ◽  
Groundwater Quality ◽  
Irrigation Water ◽  
Water Quality Index ◽  
Quality Index ◽  
Shallow Aquifer ◽  
Total Hardness ◽  
Irrigation Water Quality ◽  
Irrigation Water Quality Index

To identify the sources and quality of groundwater, the water samples were collected from 52 dug wells irrigation water in an area of 1089.82km2 and were analyses for pH, Conductivity, total dissolved solids, Calcium, Magnesium, Sodium, potassium, total hardness, Alkalinity (CO32−, HCO3−), sulphate, chloride, nitrate and fluoride to understand the (irrigation water quality index ) IWQI, The         secondary parameters of irrigation groundwater quality indices such as Sodium adsorption ratio (SAR), Residual sodium carbonate (RSC), Kelley’s ratio (KR), Sodium soluble percent (SSP), Permeability index (PI),Magnesium adsorption ratio (MAR),and CRI       (Corrosively ratio index) were calculated from the primary parameter for irrigation water quality index (IWQI). The IWQI was classified into excellent to unfit condition of groundwater quality based on their Water Quality Index (WQI). The IWQI (88%+12%) indicate that slightly unsustainable to good quality of ground water. But due to this quality deterioration of shallow aquifer, an immediate attestation requires for sustainable development.

scholarly journals Hydro-geochemical evaluation of groundwater for irrigation in the Ganges river basin areas of Bangladesh

2021 ◽  
Author(s):  
Md Shajedul Islam ◽  
Md. Golam Mostafa
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Irrigation Water ◽  
Anthropogenic Sources ◽  
Total Hardness ◽  
Water Type ◽  
Irrigation Water Quality ◽  
Ganges River ◽  
The Ganges ◽  
Ganges River Basin

Abstract Groundwater is a vital source of irrigation water, and it provides over 80% of the irrigated water supply in Bangladesh. The study aimed to assess the status of irrigation water of the Ganges river basin areas in the middle-west part of Bangladesh through the hydrogeochemical characterization and classification of groundwater. The study parameters were pH, EC, TDS, Ca2+, Mg2+, total hardness, Na+, K+, B, Cl−, HCO3 −, SO 42−, NO3 −, and PO43− along with irrigation water quality index (IWQindex), Na%, soluble sodium percentage, sodium adsorption ratio, residual sodium bicarbonate, magnesium adsorption ratio, permeability index, and Kelley’s ratio. The results showed that most of the water samples were acidic in the pre-monsoon and alkaline in the post-monsoon seasons, and the water type was Ca-HCO3. The significant geochemical process in the area determined was calcite and dolomite mineral dissolution, and there was no active cation exchange, and silicate weathering occurred. The statistical analyses showed that both the geogenic and anthropogenic sources were controlling the chemistry of the groundwater aquifers. Concerning irrigation water quality, the results revealed that all the quality parameters and IWQindex (32.04 to 45.39) were within the safety ranges, except for the EC and total hardness. The study results would be useful for future groundwater monitoring and management of the Ganges basin areas of Bangladesh part.

scholarly journals Performance of chemically resistant polyurea reverse osmosis membrane in the treatment of highly alkaline industrial wastewater containing sodium aluminate

2020 ◽  
Vol 82 (11) ◽  
pp. 2259-2270
Author(s):  
Shaik Nazia ◽  
Sugali Chandra Sekhar ◽  
Veeriah Jegatheesan ◽  
Suresh K. Bhargava ◽  
Sundergopal Sridhar
Keyword(s):  
Reverse Osmosis ◽  
Industrial Wastewater ◽  
Interfacial Polymerization ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Sodium Aluminate ◽  
Water Recovery ◽  
Cross Sectional ◽  
Feed Composition ◽  
Ro Membrane

Abstract The goal of the present study is to treat industrial wastewater containing sodium aluminate using a chemically inert polyurea (PU) based thin film composite (TFC) reverse osmosis (RO) membrane to promote water reclamation and zero liquid discharge (ZLD). Pretreatment was carried out to reduce the pH of the effluent from 12.5 to 7.1. The TFC RO membrane was fabricated by coating PU on Polyethersulfone (PES) substrate by interfacial polymerization (IP). The surface and cross-sectional morphologies of the membrane were characterized using scanning electron microscopy (SEM). The indigenously synthesized membrane was effective in the removal of total dissolved solids (TDS), chemical oxygen demand (COD), colour and electrical conductivity. The experiments were conducted by varying the feed composition of the wastewater. The maximum water recovery and flux were found to be 74% and 73.9 L/m2·h. RO process using PU membrane exhibited significant potential for cost effective, safe and pollution-free treatment of sodium aluminate industrial effluent.

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