Greentech Environment Co., Ltd.

Mengyuan Duan

Kai Sun

Mu Liu

Huiming Han

Yingqiang Su

Zehua Li

XiKun Zhu

Liyan Zhang

Xiaofeng Lin

Cong Xiao

Jin Li

Yashun Liu

A water treatment system for delaying nanofiltration membrane aluminum fouling, including an ultrafiltration system and a nanofiltration system. The ultrafiltration system includes a first water supply sub-system, an ultrafiltration membrane group and a first water production sub-system sequentially in pipeline connection. A first dosing pipeline is provided between the first water supply sub-system and the ultrafiltration membrane group, and has a dosing port for adding a first scale inhibitor. The nanofiltration system includes a second water supply sub-system, a nanofiltration membrane group and a second water production sub-system sequentially in pipeline connection. The second water supply sub-system is communicated with the first water production sub-system. A second dosing pipeline is provided between the second water supply sub-system and the nanofiltration membrane group, and has a dosing port for adding a second scale inhibitor. A control method for delaying nanofiltration membrane aluminum fouling of a water treatment system is also provided.

Control method for delaying nanofiltration membrane aluminum fouling of water treatment system

A saline wastewater treatment method is provided. Raw water is pretreated to obtain pretreated raw water. The pretreated raw water is pressurized to a preset pressure, injected with zone, separated and filtered by a filtering device with a hollow fiber nanofiltration membrane or a hollow fiber reverse osmosis membrane inside to obtain a concentrate and a permeate. A pressure of the concentrate is controlled such that ozone in the concentrate is released to form micro-nano bubbles. The concentrate is partially injected into the pretreated raw water. A pressure of the permeate and a pressure of the raw water are respectively controlled such that ozone in the permeate and the raw water is released inside the filtering device to form micro-nano bubbles to flush the hollow fiber nanofiltration membrane or the hollow fiber reverse osmosis membrane. A saline wastewater treatment system is also provided.

Saline wastewater treatment method and system

A method for controlling a hollow fiber nanofiltration membrane system with controllable power consumption, including the following steps. A filtration flow rate is determined by the program control system according to preset working conditions and the electricity price and the inlet water temperature obtained by a first monitoring module when the hollow fiber nanofiltration membrane assembly is started to perform a filtration process. The inlet water pressure change and the permeability change are monitored and recorded by a second monitoring module during the filtration process. A flushing mode and a flushing intensity of the cleaning system are determined by the program control system according to the inlet water pressure change and the permeability change during the filtration when the filtration process is completed.

Method for controlling hollow fiber nanofiltration membrane system with controllable power consumption

A hollow fiber nanofiltration membrane system and its control method are provided. The system includes a water feeding system, a return system, a hollow fiber nanofiltration membrane group, a water production system, a cleaning system, a dosing system and a program control system. Through the self-matching, self-adaptation and self-adjustment functions of the program control system, an intelligent and accurate operation control is formed according to water quality and operation condition. In the control method, the program control system presets an operation mode according to a preset working condition and an inlet water quality, automatically selects whether to add the scale inhibitor or perform concentrated water return at a beginning of filtration, automatically outputs a dosage of the scale inhibitor or the concentrated water return flow, and monitor a change of the inlet water quality, and the feedwater pressure or a transmembrane pressure in real time.

Hollow fiber nanofiltration membrane system and control method thereof

A system and method for treating reverse-osmosis (RO) concentrated water with high temporary hardness. The system includes a crystallization unit, a precipitation unit, a dewatering unit, and a programmable logic controller (PLC) system. The crystallization unit, precipitation unit and dewatering unit are connected in series, and the PLC system is configured to control pumps, valves, and displays in the crystallization unit, precipitation unit and dewatering unit. The crystallization unit includes a storage tank and a crystallization reactor communicated therewith. The crystallization reactor is provided with a pH meter, a liquid-level gauge, and a stirrer. A connection pipe between the crystallization reactor and the RO concentrated water is provided with an inlet pump and a inlet valve. A connection pipe between the crystallization reactor and the storage tank is provided with a feeding pump and a feeding valve.

System and method for treating reverse-osmosis concentrated water with high temporary hardness

A total nitrogen (TN) removal device for sewage and its operation method. The TN removal device includes a denitrification tank, a supplementary reaction zone filled with aerobic granular sludge and a sedimentation and separation zone. The supplementary reaction zone and the sedimentation and separation zone are arranged inside the denitrification tank, and communicated through a three-phase separator. The sedimentation and separation zone is located above the supplementary reaction zone. A top of the sedimentation and separation zone is greater than its bottom. A membrane aerated biofilm reactor (MABR) assembly is arranged in a space formed by outer walls of the sedimentation and separation zone and supplementary reaction zone and an inner chamber of the denitrification tank. A side wall of the denitrification tank is provided with a chemical oxygen demand (COD) detector and a nitrate nitrogen detector.

Total nitrogen removal device for sewage and method for operating the same

A system for treating printed circuit board wastewater (PCB) includes a production system, a pretreatment system, a biochemical system, a recovery system and a concentrated water treatment system. The production system is configured for producing process water and auxiliary water from tap water. The pretreatment system is configured to pretreat different wastewater samples separately. The biochemical system is configured to decompose the pretreated wastewater. The recovery system is configured to treat wastewater from the pretreatment system and the biochemical system to obtain process water and feed concentrated water to the concentrated water treatment system. The concentrated water treatment system is configured to treat the concentrated water to meet a discharge standard. A treatment method for the PCB wastewater is also provided.

System and method for treating printed circuit board (PCB) wastewater

A dosing control method for micro-flocculation in ultrafiltration, including: calculating a preset value of a first differential pressure before an initial backwash and a preset value of a second differential pressure before a final backwash in each chemically enhanced backwash cycle; calculating a preset value of a third differential pressure between the first differential pressure and the second differential pressure according to the preset value of the first differential pressure and the preset value of the second differential pressure; obtaining a predicted value of the third differential pressure according to a differential pressure curve plotted based on online filtration differential pressure data; and comparing the preset value of the third differential pressure and the predicted value of the third differential pressure to determine whether to dose. A dosing control system is also provided.

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Beijing, China

Mengyuan Duan