Industrial Wastewater Introduction
The various wastewater types produced in the industrial production process, due to their different compositional properties, often require various combinations of processes to meet the relevant emission standards. The typical treatment process is as follows:
Physicochemical (additive coagulation, ozone oxidation, air floatation, etc.)
Biological treatment (anaerobic, aerobic, biological filter, etc.)
Filtration (centrifugal separation, multi-media filtration, activated carbon adsorption filtration, etc.)
Evaporation (multi-effect evaporation, MVR, etc.)
Industrial Wastewater Membrane Treatment Process
Because the traditional treatment process is mainly based on the goal of achieving compliance with emissions, it is difficult to have direct benefits. In recent years, with the development of membrane separation technology, its combination with traditional wastewater treatment processes has shown more and more advantages. Typical examples are:
Membrane bioractor MBR - combined with bioreactors to enhance bioprocessing efficiency;
Nanofiltration membrane technology NF - high efficiency softening, desalination and recycling;
Tubular membrane technology TUF - combined with the coagulation reaction to achieve high efficiency in hardness removal and heavy metals removal;
Double-membrane wastewater reuse (UF+RO) - reuse of treated wastewater;
High pressure reverse osmosis (DTRO) - concentrating treatment of high COD and high solids wastewater.
Application Case (MBR)
Coal Chemical Industry Wastewater Treatment Sidestream MBR System
The use of membrane bioreactor technology (MBR) in the biochemical treatment of industrial wastewater is an increasingly important application trend. It not only improves the efficiency of activated sludge treatment and reduces the system footprint, but it also achieves very high water quality, realizing the advanced treatment and reuse of wastewater.
At present, the membrane technologies that can be used to construct MBR mainly include immersion processes (such as flat membranes, hollow fiber membranes, ceramic membranes) and sidestream MBRs (tubular membranes, ceramic membranes). Among them, the application of tubular membranes to construct sidestream MBR has obvious advantages:
High activated sludge concentration: 15-35 g/L
High membrane flux:70-120LMH
Long membrane lifespan more than 5 years
Easy maintenance:the equipment is external, can be cleaned online, no need offline cleaning, and easy maintenance
Jiarong Technology implemented the sidestream MBR system for industrial wastewater treatment with a capacity of 2400 m³/d at a chemical plant in Yulin, China in 2009.
Process Flow:
Natural gas wastewater——Aerobic——Tubular TMBR——Clear liquid——Reuse for circulating cooling water
Yulin External TMBR System Site
The main technical index of the equipment:
Equipment processing scale: 100m³/h
System operating pressure: 6bar
Activated sludge concentration:10-15g/L
Influent CODcr: 1000mg/L
Effluent CODcr: 10mg/L
Date of completion：2009
Application Case (DT)
Radioactive Wastewater Treatment
The wastewater in the nuclear industry is radioactive. Conventional methods such as coagulation and sedimentation can cause secondary pollution of the sludge. For example, the use of evaporative enrichment consumes a lot of energy and tends to cause condensation due to foam entrainment in the evaporation process. The liquid also has different levels of radioactive contamination and needs to be treated again. Jiarong Technology DTRO high concentration membrane technology can be used for the high concentration of radioactive wastewater. The production of water can meet the strict discharge standards, is concentrated and then further processed according to the needs of the process.
The main technical indicators of the equipment：
Equipment processing scale：400L/h
Water recovery rate: ≥ 98% (50 times concentrated）
Total desalination rate: ≥ 98% (influent TDS:1000- 5000mg/L）
Modular design, fully automatic remote control
Membrane module: DTRO
Nuclear Industry Radioactive Wastewater Three-Level DT Membrane Treatment System
Application Case (TUF+MTNF/RO）
Chemical Plant KF Waste Liquid Recovery and Concentration
In the production process of potassium fluoride prepared using potassium fluorosilicate, potassium fluoride of potassium fluorosilicate is used as a by-product of the defluorination purification of wet-process phosphoric acid to produce potassium fluoride and simultaneously produce white carbon black and ammonium bifluoride. The potassium fluorosilicate is of low purity and contains impurities such as soluble phosphorus. Therefore, in the process of co-producing white carbon, potassium fluoride filtrate after pressure filtration may contain impurities such as phosphorus. Jiarong provides a high concentration membrane technology (MTNF/MTRO) to remove silicon and phosphorus contained in the potassium fluoride pressure filtrate and minimize the loss of potassium fluoride as an active ingredient. Through the membrane technology, the potassium fluoride filtrate is treated. The equipment has a small footprint, simple operation and maintenance, low energy consumption, and can improve product quality, enhance product value, and reduce loss of high-value products.
The project design process has applied for national invention patents.
Process Flow:
KF settling effluent——Tubular TUF——Serum——MTNF/RO two-stage membrane system——Concentrate/filtrate recovery
Shandong Jinzhengda MT high enrichment equipment on-site pictures
Themain technical index of the equipment：
Equipment processing scale：20m³/h*2
System operating pressure: 60bar
KF concentration: 8-9%
Design recovery rate：≥ 95%
Membrane module: tubular UF+MTNF/MTRO
Application Case (ST）
Incineration of High-Salt Wastewater in Power Plants
Leachate treatment in incineration power plants is a kind of high-concentration wastewater (the influent water COD is often as high as 3-4 million mg/L). The current treatment process generally uses biochemical (anaerobic and aerobic) + membrane bioreactor MBR + nanofiltration NF & anti-infiltration RO treatment process to meet the national discharge standards. However, due to the relatively high salt content in the leachate from waste incineration power plants (the TDS of the influent solution is often as high as 30,000), the treatment process often has 40% of the NF&RO concentrates, which are difficult to handle. Generally, the waste incineration power plant will concentrate. The liquid may be sprayed on the garbage dump or used for ashing, but it is difficult to completely eliminate the liquid because the amount of concentrated liquid is too large.
For this reason, Jiarong Technology Design adopted ST technology for advanced treatment, replacing the traditional NF/RO combination process and directly processing and concentrating the MBR effluent. The recovery rate can reach over 80%, and the concentration of concentrated water can be reduced by more than 50% for convenient digestion to achieve zero emissions.
Process flow:
Leachate——Anaerobic/aerobic——MBR bioreactor——STRO single membrane system——dialysate discharge
Xichang Sanfeng Energy STRO high concentration plant site picture
The main technical specifications：
Equipment processing scale：130m³/d
Influent TDS：15000-20000mg/L
Influent CODcr：1000-2500mg/L
Design recovery rate：≥ 80%
Membrane module：STRO 20 pieces
Produced water quality：CODcr ≤ 60mg/L；
Meets the 2008 Table 2 emission standards.
Application Case (DT/ST）
Discharge of circulating water and zero concentration discharge of high concentrated RO concentrated water
In chemical and electric power industries, there are large-scale circulating cooling water treatment systems or desalinated water systems that require regular discharge of concentrated water. At present, most companies in concentrated water have implemented recovery and zero-discharge. The conventional recovery system mainly uses low-pressure RO, and the overall recovery rate is limited. The TDS of concentrated RO water often can only reach 2-4%. If this concentration enters the evaporator, the investment and operating costs are still high.
The water volume of such projects is often large, the TDS is high, and the fouling tendency is more serious. Therefore, the main process of Jiarong technology design uses DT or STRO technology to carry out advanced treatment of this type of concentrated water. DTRO is used for the design of water with poor pretreatment conditions and strong tendency to foul. For the well-pretreated water quality such as softening and hardening of the original concentrated water, the STRO system is designed to concentrate, reducing system investment and land occupation. Under normal circumstances, the TDS of the concentrated solution can reach 80-100,000 mg / L. If re-concentration is required, our company can use high-pressure HP-DTRO (120bar) or EDR technology to further increase the TDS to 120,000-150,000 mg / L. Then enter the multi-effect evaporator or MVR to achieve zero-emission.
Process flow:
Circulating-cooling water or desalinated RO concentrated water-hardness removal pretreatment-DTRO/STRO membrane system-concentrated liquid-MVR
Zero-discharge equipment for coal chemical wastewater from Yangmei Group
The main technical index：
Equipment processing scale：40m³/d
Influent TDS：15000-50000mg/L
Influent concentrate TDS：80000-120000mg/L
Design recovery rate：≥ 80%
Membrane module：DT OR STRO
(ST with better pretreatment conditions and DT with poor pretreatment conditions)
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