Jiangsu Huda Chemical Technology Co., Ltd. phenolic resin wastewater recycling and utilization reporter: Wang Xiaosi Catalog:
1. Introduction to Huda chemical
2. Source and characteristics of phenolic resin wastewater
3. Recycling method of phenolic resin wastewater
4. Introduction to the case of Huda chemical resources
5. Precautions for waste water recycling process
6. Introduction to the new process of chemical wastewater in Huda
01 introduction to Huda chemical
Jiangsu Huda Chemical Technology Co., Ltd. has always been guided by customers and market demand, insisting on independent research and development and introduction- The road of technological innovation of digestion absorption integration is to build an extremely open R & D system. Over the years, it has overcome the wastewater treatment problems such as phenolic resin wastewater, coal chemical wastewater containing phenol and high salt, antioxidant wastewater in printing and dyeing industry, glyphosate pesticide wastewater, etc., and established good production and research institutions with Tianjin University, Nanjing University, Nanjing University of technology and other famous domestic universities and research institutions Research cooperation relationship. The company has applied for nearly 30 patents, implemented dozens of engineering projects in phenolic resin, coal chemical industry, fine chemical industry, pesticide and other industries, spread over many regions in China, with good operation effect, and won high praise from customers and the industry.
Source and characteristics of 02 phenolic resin wastewater
Phenolic resin, as one of the three synthetic resins, is widely used in molding plastics, adhesives, coatings, foam plastics, ink and other fields. Phenolic resin wastewater mainly comes from the production process of phenolic resin.
The main components of wastewater are phenols, aldehydes, alcohols, organic solvents, oligomers, modifiers, etc,
It has the characteristics of high COD, high biological toxicity, low removal rate of general oxidation pretreatment, direct biochemical degradation and so on;
03 recycling method of phenolic resin wastewater
A extraction method
solvent extraction
advantage:
(1) it can realize DCS or PLC control and stable water output
(2) the recovered phenol is directly used in production and has no impact on product quality
(3) it is beneficial to the follow-up biochemical treatment
(4) suitable for continuous production with large amount of water
Disadvantages:
① Large primary investment ② workshop is class a device
Complexation extraction
advantage:
① Small one-time investment ② low requirements for plant
Disadvantages:
① Extractants are susceptible to contamination
② Recovered phenol contains inorganic salt to product
Quality has an impact
B reduction method
Secondary condensation, delayed condensation
advantage:
① Simple process and less investment
② Formaldehyde can be treated at the same time
Disadvantages:
① Unstable effluent index and difficult management
② Resin recovery is troublesome
C adsorption method
advantage:
① It can be controlled by DCs or PLC, and the effluent is stable.
② The recovered phenol can be directly used in production
Disadvantages:
① Difficult resin regeneration ② large investment
Aldehyde recovery
rectification:
Pressurized distillation: Recycling formaldehyde in the workshop
Chemical reaction:
Supporting production of urotropine, methylal, urea formaldehyde resin
Damage method:
Saccharification or disproportionation: adding sodium hydroxide or lime
Advanced oxidation: ozone oxidation, ozone hydrogen peroxide oxidation
04 case introduction of chemical resources in Huda
Case 1:
10 t / D phenolic resin wastewater
Process flow diagram:
Raw water → condensation recovery resin → advanced oxidation → biochemical treatment → discharge up to standard
Comparison of water quality of 10 t / D phenolic resin wastewater after treatment
Project investment: 900000
Operation cost: 40 yuan / ton
Case 2:
Water volume: 100 tons / day
Emission standard: gb31572-2015 indirect emission standard
Main emission indicators:
Phenol content: ＜ 0.5mg/l
Aldehyde content < 2mg / L
COD＜500mg/L
NH3-N＜25mg/L
Water quality: pH: 2-3
Phenol content: 10000mg / L
NH3-N：150mg/L
Formaldehyde content: 5000mg / L
COD:100000mg/L
TDS:1500mg/L
Project investment: 7.8 million
Operation cost: 36 yuan / ton
Process flow diagram:
Raw water → phenol recovery → advanced oxidation → aldehyde removal → anaerobic / anoxic → aerobic biochemistry → discharge up to standard
Process design description
1. Resin recovery process: the phenol in water is reduced to less than 1000mg / L and the aldehyde content is reduced to
Within 2000mg / L.
2. Advanced oxidation combination process: further reduce the phenol and aldehyde in water, through which the phenol content can be reduced to
Within 100mg / L, aldehydes and COD decreased by 30-50%
3. Formaldehyde removal: the formaldehyde reaction is converted into biochemical alcohols or sugars, and the formaldehyde content in the effluent can be reduced to less than 100mg / L
4. Anoxia: hydrolyze macromolecules in water to small molecules, reduce cod30%, and increase B / C to more than 0.5
5. Aerobic biochemistry: further reduce the organic matter in the water to meet the indirect emission requirements.
Case 3:
Water volume: 200t / day
Emission standard: gb31572-2015 indirect emission standard
Main emission indicators:
Phenol content: ＜ 0.5mg/l,
Aldehyde content < 2mg / L,
COD＜200mg/L ,
NH3-N＜15mg/L
Water Quality:
COD：160000mg/L
PH: 2-5
NH3-N :50mg/L
TDS :1000mg/L
Phenol: 40000mg / L
Formaldehyde: 5000mg / L
Project investment: 11 million
Operation cost: 50 yuan / ton
Process flow diagram:
Raw water → advanced oxidation → anaerobic / anoxic → primary aerobic → secondary aerobic → phenol recovery → discharge up to standard
Process design description
1. Phenol recovery: direct recovery of phenol for production by solvent extraction.
2. Advanced oxidation process: further reduce the phenol and aldehyde in the water. Through this process, the phenol content can be reduced to less than 100mg / L, the aldehyde content can be reduced by 30%, and the COD can be reduced by 30-50%
3. Anoxia: hydrolyze macromolecules in water to small molecules, reduce cod30%, and increase B / C to more than 0.5
4. Two stage aerobic biochemistry: further reduce the organic matter in the water to meet the first stage discharge requirements.
05 precautions for waste water recycling process
A condensation precautions
① Molar ratio of aldehydes to phenols
② PH of reaction process
③ Discharge time
B precautions for solvent extraction
① Extraction ratio
② Packing and feeding mode of distillation column
Precautions for c-complexation extraction
① Extractant regeneration
② Use of recovered phenol
D precautions for formaldehyde recovery
① Equipment material
② Equipment blocked
Introduction to the new process of phenolic wastewater in 06 Huda chemical industry
New process combination: pre condensation + extraction + Advanced Oxidation + biochemistry
Technical service object: phenol formaldehyde resin wastewater of less than 30 tons / day
Advantages of new technology:
① Phenol formaldehyde removal effect is good, COD of biochemical influent water is reduced to 3000-5000mg / L
② Small equipment area and low investment cost
③ Effective recovery of extractant and low efficiency of extraction cycle
④ Simple operation and low operation cost
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