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Guizhou 1600 TPD phosphorus-containing wastewater mother liquor recycling project

Guizhou 1600 TPD phosphorus-containing wastewater mother liquor recycling project

Guizhou 1600 TPD phosphorus-containing wastewater mother liquor recycling project

Water Quality

Glyphosate wastewater: Is toxic and harmful industrial glyphosate production wastewater, the emission quantity is large and pollutive range is wide. The glyphosate production wastewater contains organics such as iminodiacetic acid, chloroacetic acid, triacetic acid amine and glycine which are difficult to biodegrade. The COD concentration is high and have poor biodegradability.

Phosphorus-containing Wastewater:

Chemical Industry: from industrials such as paper industry, phosphate fertilizer industry, etc. The wastewater discharged from the phosphate fertilizer plant is acidic wastewater, and the characteristic pollutants are fluoride and total phosphorus, which are harmful to the water body;

Biochemical Pharma: For example, a pharmaceutical corporation in Jiangsu is a bio-pharmaceutical company, the main products are adenosine triphosphate and adenosine monophosphate. It is an important raw material and intermediate for the pharmaceutical industry of nucleoside acid. Wastewater generated from resin adsorption and desorption and other sections contain a large amount of organic phosphorus and inorganic phosphorus, resulting in a higher concentration of TP, CODCr in the integrated wastewater.

Metal Surface Treatment: The casing of the washing machine is made of cold-rolled galvanized iron, which must be pre-treated before spraying; The high-speed double-row flat-plate spraying line of the refrigerator company must also be pre-treated before spraying. The main process of pretreatment is degreasing and phosphating. The main components of the degreasing agent used are soda and surfactant. The main component of the phosphating solution of the washing machine company is zinc dihydrogen phosphate. The main component of the phosphating solution of the refrigerator company is sodium dihydrogen phosphate. Therefore, the waste water discharged from the pre-treatment section contains toxic and harmful substances such as oil, Zn2+ and phosphate, especially phosphate content is very high.

Treatment Purpose

Hazards for glyphosate production wastewater: 

The main raw materials for producing glyphosate are diethanolamine, caustic soda, 30% liquid alkali, heavy metal catalyst, hydrogen peroxide, sodium tungstate, liquid ammonia, deionized water, hydrochloric acid, formaldehyde, phosphorus trichloride, ferrous sulfate and the like. The glyphosate wastewater is an organic high-concentration heavy metal-containing wastewater discharged from the chemical pesticide industry during the production of glyphosate powder and water.
    Glyphosate wastewater also contains high concentrations of organic phosphine compounds, which are biologically toxic. The wastewater contains 1% heavy metal catalyst, 3% formaldehyde, 3% to 3.5% glyphosate, 20% sodium chloride and unreacted bisphosphane and other by-products. Glyphosate wastewater is complex and is not easy to degrade. If the direct discharge of wastewater will have a serious impact on the living soil of corn, soybeans, etc., it will also pollute the water source. The treatment is difficult, and water pollution and soil problems are prominent.

Hazards for phosphorus-containing wastewater:

(1) Phosphorus is a key nutrient that causes eutrophication of water bodies. The eutrophication of water not only causes the algae in the water to grow wildly, but also causes the oxygen content of the water to drop sharply, affecting the survival of aquatic organisms such as fishes.

(2) The eutrophication of water bodies is represented by “water blooms” in lakes and reservoirs. The main hazard is that the transparency of the water body is reduced, the reoxygenation capacity is weakened, and the type of fish, especially the fish with economic value, is reduced. After the algae dies, the decomposition consumes dissolved oxygen. Insufficient dissolved oxygen and certain toxic algae can also cause fish to die. The indecomposable organic matter will sink to the bottom of the water, causing the lake and the reservoir to become increasingly shallower, accelerating the aging of the lake. The eutrophication of inland and urban lakes and reservoirs in China is widespread, and the situation is quite serious. The pollution of the three famous lakes in Dianchi Lake, Chaohu Lake and Taihu Lake is particularly striking.

(3) The eutrophication of water bodies is characterized by “red tides” in the oceans, that is, water color anomalies and water quality deterioration caused by the reproduction of some plankton in the waters. One or several species of plankton in the ocean explode or accumulate under certain environmental conditions, causing discoloration of seawater, affecting and endangering the normal survival of other marine organisms, and causing disastrous marine ecological anomalies.

Process Flow Diagram (Featured Process)


Process Description

² Multiple Media Filtration (MMF): Suspended particles and colloids in water are intercepted at the surface or internal gaps of the quartz sand bed and anthracite layer of the filter when water or wastewater pass through, thus clarify the water. The Turbidity of inlet water is normally smaller than 20, the turbidity of discharge water is capable of less than 3. The system could remove the suspended particles, colloids, turbidity, etc. from raw water, the removal rate of suspended particles could reach 90%.

² Ultrafiltration (UF): Ultrafiltration is a type of pressurized membrane separation technology that allows a small molecule of solute and solvent to pass through a specific membrane of a certain pore size under a certain pressure, so that the macromolecular solute is impermeable and remains on one side of the membrane. Thereby the macromolecular material is partially purified, and after passing through the ultrafiltration membrane, most of the colloidal silicon contained in the water can be removed, and a large amount of organic matter can be removed.

² Nanofiltration (SCNF): SCNF is a type of membrane separation technique uses pressure difference as the driving force, intercepting nanoscale particles in the water which is between reverse osmosis and ultrafiltration. Compared with ultrafiltration and reverse osmosis, the removal rate of monovalent ions and organics which the molecular weight is less than 200 is poorer for nanofiltration, but the removal rate of divalent or polyvalent ions and organics which the molecular weight is between 200 to 500 is higher. The system could remove divalent ions and separate salt from raw water, with divalent ions removal rate of more than 95%.

² SEMED: Desalinize the raw water, achieving the separation of glyphosate and salt, the removal rate of salt can achieve above 90%.

Process Advantages

Low Operating Costs: Adding membrane concentration reduction module between pretreatment and advanced oxidation system can improve advanced oxidation efficiency, reduce advanced oxidation investment, save operating cost, and comprehensive investment cost-effective;

Wastewater Recycling: The use of membrane separation and concentration of advanced oxidation integration technology to convert organic phosphorus into inorganic phosphorus, to achieve the resource utilization of phosphorus and the resource utilization of salt, to create economic value.

Zero Discharge: Using MVR evaporative crystallization to produce high-purity refined salt, achieving zero wastewater discharge, meeting environmental protection requirements.

Case Introduction

1600m3/d Guizhou Glyphosate Mother Liquor Recycling Project (Phase I and Phase II)

Project Name

1600m3/d Guizhou Glyphosate Mother Liquor Recycling Project (phase 1 and 2 are both 800 m³/d)


A pesticide company in Guizhou


Liupanshui, Guizhou

Process and Configuration

Electrodialysis technology is used to recover the active components in the mother liquor to achieve the goal of resource utilization.

Effective separation of salt and COD to achieve the goal of harmless waste liquid


Project Characteristics and Highlights

1、 The water source of the project is the mother liquor for pesticide production;

2、 including works such as equipment supply, installation, commissioning, etc.

3、 using heterogeneous ion exchange membrane, recycling target

4、 the content of active ingredients in product water increased by 200%, to achieve the purpose of production reuse, and the product water meet discharge requirements

Total Duration

4 Months

Construction Time

June 2014

Completion Time

October 2014


The project was successfully accepted and is currently operating well


Related tags:海水淡化厂家

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