How do I know when to clean a Reverse Osmosis Purified Water System?
Reverse Osmosis Purified Water System should be cleaned when the data indicates that the performance of the membrane is beginning to deteriorate. We do not recommend relying on a set cleaning date. It is recommended to monitor the normalized permeate flow, salt passage, feed pressure, differential pressure, conductivity/TDS, and overall product-water quality.
When the permeate flow starts to decline, the feed water pressure increases, and the conductivity increases, it may be a sign of membrane fouling, scaling, particulate accumulation, or biological contamination. These changes should be compared to the normal baseline condition of the system, as raw water conditions and operating load may influence the rate of fouling. The pretreatment should also be examined. When the sediment filter becomes clogged, the media becomes exhausted or the chemical dosing is not adequate, the RO membranes can be subjected to extra load, leading to shorter cleaning cycles.
If a cleaning operation is needed, it must be performed in a manner that is similar to the type of fouling. We have published maintenance guidance notes, which explain that acid cleaners are applied to scale, alkaline cleaners are applied to organic fouling and appropriate biocides are applied to biofouling. Always refer to the membrane manufacturer's or system supplier's instructions for membrane cleaning as other chemicals or concentrations may damage membrane elements.
Thus, for the use of the Reverse Osmosis Purified Water System in industrial pure-water production, the membrane performance and upstream pretreatment must be checked as part of the routine inspection. Operating records can be helpful to recognize trends before water production or water quality significantly reduces.
The aim is to clean when the data indicate a true change in performance and to keep the pretreatment and operating parameters within normal limits between cleanings. This helps ensure stable performance of the system over time.
Yes. QILEE’s containerized wastewater treatment products are designed for temporary and emergency treatment applications. Construction camps, military bases, disaster relief, and fast-deployment sites are among the applications the company says its containerized systems are used for. These systems are designed as modular, integrated systems that can be transported and set up to match the treatment needs of the site.
The containerized format is especially applicable when wastewater treatment is required at a temporary site, or when permanent treatment infrastructure is not available right away. QILEE’s systems can be deployed quickly, and according to its website, containerized treatment is “ideal for temporary facilities and disaster areas where water needs to be rapidly managed.” This format can also be useful where a treatment plant needs to be moved or installed without building a permanent facility from the beginning.
QILEE offers a specific emergency sewage and mobile treatment solution for emergency situations. The mobile containerized system can be transported to the site. When it is delivered, only simple water and electrical connections are required, and it can be put into use within 2–4 hours for sudden pollution events. This makes the format relevant to situations where treatment capacity is needed within a short period.
QILEE also provides a variety of treatment options instead of using a single treatment process for all projects. The system may use biological, membrane, chemical, or other treatment technologies, depending on the characteristics of the wastewater and treatment requirements. The specific configuration therefore depends on factors such as wastewater type, pollutant levels, required treatment quality, and the intended application.
The transportability and quick deployment of QILEE’s container-based wastewater treatment systems thus make them an appropriate format for temporary, mobile, and emergency treatment where conventional permanent infrastructure may not be immediately available.
QILEE’s containerized wastewater treatment systems are based on an integrated treatment system that is chosen to meet the needs of the specific wastewater and treatment goals. There is no single process for all applications. Specific containerized configurations are available for different wastewater applications, and the company’s containerized solutions can incorporate technologies like MBR, UF, NF/RO, TMBR, and other treatment processes.
QILEE provides the following containerized domestic sewage treatment system: A/O + MBR. This technology is a combination of the anoxic/oxic biological treatment process and membrane bioreactor technology. According to QILEE, this is a “domestic wastewater treatment and decentralized sewage treatment solution.” It is comprised of an A/O + MBR containerized wastewater treatment plant, which is suitable for towns, rural areas, resorts, and islands. The treatment stages work together to reduce pollutants and produce treated water that can meet the required discharge or reuse objectives.
The situation may be different for industrial wastewater. The combinations described by QILEE include MBR, DAF with chemical dosing, chemical treatment, TMBR, and NF + RO. Such processes may be combined based on the characteristics of the wastewater, such as the pollutant type, concentration, and wastewater volume. This means the treatment sequence can vary depending on what needs to be removed and the required final water quality.
So the fundamental principle is application-specific and integrated treatment, not one standard treatment. The selected treatment units are packaged into a compact, transportable system, with the equipment and treatment stages coordinated within the container. This allows the system to be configured to meet a variety of wastewater treatment needs while simplifying transportation and on-site installation.
This industrial concept of water-reuse, QL-MBR-RO, consists of two industrial treatment steps we have documented in our containerized MBR+RO system: membrane bioreactor treatment and reverse-osmosis polishing. The MBR stage is used for biological treatment and solid-liquid separation, and the RO stage is used to further treat the permeate for reuse, resulting in higher-quality permeate.
The first part of the wastewater is passed through the MBR section. In this stage the activated sludge serves as a biological treatment system to remove biodegradable pollutants. The biomass and suspended solids remain on the submerged flat-sheet PES membranes, resulting in the separation of clarified permeate from the combined liquor. We have already published our MBR+RO product information, which declares that the MBR part is effective for the removal of BOD and suspended solids in high MLSS.
The water treated using MBR then flows to the downstream RO section. The polishing action is achieved through Reverse Osmosis which will remove dissolved salts and any remaining dissolved contaminants. This results in higher-quality treated water than the MBR stage alone.
The basic documented workflow is thus:
The wastewater is treated by an MBR system, followed by RO polishing and subsequently reused.
Our containerized MBR+RO industrial water-reuse system includes applications such as process make-up, cooling tower feed, equipment washing, irrigation and sanitary uses (non potable). According to the same page, compatible industrial wastewaters, municipal sewage, greywater, and other appropriate streams can be used as feed whereas wastewater that contains significant amounts of oil, chemicals, high salt levels, or high-strength pollutants may require some pretreatment.
Also, membrane maintenance is included in the routine operation. MBR backwashing/air scouring and periodic RO chemical cleaning are published as part of the maintenance information for this unit. If additional treatment is needed beyond that provided by the raw feed water and final reuse requirement, it should be chosen according to those specific requirements.
Post-sales services we provide for industrial wastewater treatment include commissioning, operator training, maintenance support, spare parts assistance, and technical support after system delivery. These are support areas, and the exact scope of the services will depend on the equipment and project agreement, but they are described across our service and project information.
Our published service material embraces site acceptance testing and startup checks that consist of pressure checks, leak checks, hydraulic balancing, membrane integrity testing, and validation of chemical dosing systems, as applicable, during site installation and startup. Commissioning can also involve setting PLC set points, alarm thresholds and system controls prior to handover.
Handover includes operator training. We can provide maintenance services including routine operation, safety procedures, emergency shutdown, troubleshooting and daily maintenance. It is particularly relevant for industrial wastewater treatment plant systems comprising pumping stations, membranes, dosing units, instruments and automated controls.
Our industrial wastewater treatment equipment with technical and maintenance support also refers to onsite installation guidance, operator training, regular maintenance and technical support. Longer term operation is available as preventive maintenance programs and service agreements.
Another component of after sales service is spare parts support. Our published material includes parts for components including membranes, pumps, valves and electrical controls as well as upgrade and retrofit support where applicable.
The Terms and Conditions of the service package should be confirmed for the particular system as per the project, as the warranty, maintenance contract, requirement on-site, and spare parts arrangement might vary from project to project. The goal is to ensure stable operation upon commissioning and provide the site personnel with documentation, training, and technical support to ensure operation and maintenance of the treatment system provided.
The first step in selecting the appropriate industrial wastewater treatment system is the wastewater analysis and the desired treated water quality. Common treatment challenges, identified in our industrial wastewater material, include high BOD and COD, suspended solids, heavy metals, oils, toxic compounds, and refractory material. Therefore the selection of a system should be based on the contaminants that are detected, the concentration of the contaminants and whether the water is discharged or reused, and the flow rate of the water.
The first step is to specify the influent conditions. If the wastewater has high suspended solids, oils or colloids, it might need physicochemical pretreatment. We have a DAF with chemical dosing system to remove these contaminants and to reduce the loading on downstream treatment. Biological treatment can be used for wastewater with biodegradable organic pollutants, and membrane processes for those projects that demand deeper purification.
Complex wastewater effluent solutions are available with our industrial wastewater treatment systems, like MBR, DAF + chemical dosing, chemical treatment, TMBR, and NF+RO. After earlier treatment, NF+RO is used as a deep treatment and desalination stage to further remove the residual organics, salts, heavy metals and other pollutants.
Another factor in treatment is capacity. The industrial wastewater systems are containerized and can be designed for various flow and contaminant concentrations, and modular structures enable treatment units to be scaled to suit project requirements.
The site conditions also need to be taken into account, as available footprint, access, utilities, and future expansion requirements will influence the equipment layout.
So a suitable system isn't picked based solely on the technology's name. Before this, the type and concentration of pollutants, daily treatment load, influent characteristics, discharge or reuse specification, and site conditions should be determined, and then a biological, chemical, physical or membrane treatment stage selected to meet the requirement.
Yes. We offer tailor-made water treatment solutions depending on the quality of the water, treatment flow, desired water quality and operating conditions for the project. On our website we clearly specify that it is possible to develop customized designs for containerized membrane systems with regard to the water quality from the influent, treatment capacity and discharge/reuse requirements.
Customization may be either on the process route or the equipment configuration. We offer several membrane technologies such as UF, MBR, RO, NF, MF, DTRO, ED, EDR and these can be offered individually or in combination in multi-stage systems. Additional technologies that can be incorporated into industrial wastewater projects include chemical treatment, dissolved air flotation (with chemical dosing), and NF+RO.
For instance, the custom water treatment systems and integrated systems cover various treatment needs and not just one set. The Reverse Osmosis Purified Water System is also referred to as customizable based on the raw-water quality and client requirements. In larger membrane projects, parameters such as membrane element type, operating pressure, recovery rate, water yield, and automatic control mode can be set according to the project.
The industrial wastewater system is also modular—containerized. Treatment units can be configured for assembly, upgrading, or integration based on the type of wastewater, concentration of contaminants and discharge applications. This allows the system to be changed based on the project's requirements, such as when one project needs biological treatment while another needs chemical treatment or more complete membrane polishing.
The key initial data needed to develop a customized solution is the influent water analysis, treatment volume, desired effluent quality, and site conditions. Those inputs dictate processes and equipment that need to be incorporated, not just added on to an existing system based upon capacity.
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E-mail: qilee@qileegroup.com
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