A water treatment system combines a microfiltration or ultrafiltration membrane system with a downstream reverse osmosis membrane system. The MF or UF system has multiple trains of immersed membrane modules. The trains are connected to a common permeate pump. The permeate pump discharges directly into the inlet of an RO feed pump. The membrane trains are each subjected to the same suction. The permeate pumps are operated to provide the required flow to the RO feed pump at or above the minimum inlet pressure of the RO feed pump.

Combined microfiltration or ultrafiltration and reverse osmosis processes

Through process optimization and adjustment,the research and development task of continuous membrane filtration system for Tianjin seawater desalination demonstration project was accomplished.As the equipment composing and technical characteristic presented,circulating pressure,transmembrane pressure,system flux,production consuming and produced water quantity were concluded.

Application of continuous membrane filtration system in seawater desalination further treatment

—Population growth has resulted in a decrease in readily available sources of potable water. Desalination is one of many approaches that has been studied and proposed as a way out of this predicament. In this study, multistage Reverse Osmosis desalination process is used in the model, since it has the potential to achieve a higher purity percentage than the single-stage RO desalination process. Some researchers have studied the distinctive tools of AI, specifically Artificial Neural Network as regression model and the genetic Algorithms as an optimization technique in the process of desalination and water treatments. This paper aims to examine multistage RO desalination by employing various artificial intelligence (AI) techniques, including Artificial Neural Network (ANN) and Support Vector Machine (SVM). Both training methods used for this research come under the category of regression algorithms, which are used to establish a predictive link between variables and labels. The main finding of this study was the noticeable decrease of Mean Square Error (MSE) in second stage when data was trained using the ANN. While on the other hand the MSE increased in second stage when the data was trained using the SVM. It can be concluded that the results of this research indicate that applying ANN and SVM to RO desalination process modelling would yield substantial improvements. Future work will be focusing on predicting and improving the performance of ANN and SVM prediction with other function variables.

Analyzing Multi-stage Reverse Osmosis Desalination Using Artificial Intelligence

Human machine interface is a link between the machine and the operator. In other words, HMI – Human machine interface is the point of contact to interact and get the status of the process. HMI is used to display the status of inputs and outputs. The process can be monitored continuously without any intervention. HMI has the ability to receive the data from a programmable logic controller. The communication between the industrial controller and human machine interface can be by RS485 or RS232 communication protocol. In this project, a simulation of reverse osmosis process/plant using Delta HMI and Delta PLC is executed. Reverse osmosis plant contains solenoid valves and pumps. The solenoid valves can be operated by AC voltage or DC voltage. The pumps can be turned on and off using contactors. DOPSoft4.0 and ISPSoft3.15 software’s are used to design the components and program.

Monitoring RO Plant using Virtual HMI and PLC with Visual Programming Tool

Water is a primary human need Of the total fresh water in the world, less than 1% are ready to drink and 11% of the total human population cannot achieve it WHO/UNICEF by 2015 reports there are nearly 750 million people in the world who still have inadequate drinking water The current condition is also occurs in the Ay Island which located in Banda Naira Islands, Central Maluku, Indonesia Ay Island residents have to travel for 4 hours to the main island of Banda Naira to buy clean water To overcome the current situation, the government have tried to provide clean water by building a $4 billion dam project in 2016 However, the dam project is not able to meet the needs of the resident because of the polluted water In this research is proposed an Eco Water Treatment by using Parabolic Solar Concentrator and Photovoltaic Pump This method consists of two main parts, PV Sea Water Pump and Solar PV-Distillator The PV Pump is used to deliver water from the sea to the boiler, while the solar-powered distillator converts sea water into fresh water Fresh water generated from the distillator have the same content as the Indonesian Minister of Health's standard The system can provide clean water for 50 liter continuously based on capacity of the boiler each day depend on the weather and the temperature From the experiment, proven that solar concentrator could increase the boiler temperature up to 300oC to boil the seawater and produce clean water

https://iopscience.iop.org/article/10.1088/1757-899X/383/1/012061/pdf

Design and implementation of seawater eco distillatory using parabolic solar concentrator and photovoltaic pump for isolated island

The paper proves the feasibility of using the ultrafiltration combined with reverse osmosis to desalt sea water in Bohai Bay over four-month pilot running. The results show that the influent quality is not influenced by the UF effluent quality and the optimum operational parameters are the flux 62.5 L/m2·h, the quality of UF permeate was excellent, with turbidity measured below 0.13 NTU and 94% of the SDI15 below 3.0. The ultrafiltration membrane could feed water into the reverse osmosis systems sequentially and steadily, and the salt rejection of reverse osmosis membrane was above 99.1% and stable during the experimental time. Therefore, this method can be used to provide clean materials for multipurpose development of the seawater due to being simple process and low-cost investment.

A pilot study of ultrafiltration pretreatment for seawater reverse osmosis desalination in Bohai Bay

According to the characteristics of water quality in Tianjin Bohai Bay, ultrafiltration (UF) pretreatments prior to SWRO without any chemicals and with coagulation were studied. Under the same operational and cleaning conditions, two pilot tests were discussed through monitoring and analyzing water quality, assessment of flux and transmembrane pressure. The study showed that both of the UF pretreatment processes could enable the reverse osmosis (RO) pilot plant to run steadily. But, UF pretreatment without any chemicals had a simpler process, lower investment and operation cost. At the same time, no chemical was injected into the system, so there was no membrane fouling caused by the addition of coagulation. It could be concluded that UF pretreatment without any chemicals had better applicable value and application prospects.

Ying Liu

Papers

A pilot study of ultrafiltration pretreatment for seawater reverse osmosis desalination in Bohai Bay

Study on the comparison between ultrafiltration pretreatment without any chemicals and with coagulation in seawater desalination