JB/T 6932-1993 Biological contact oxidation method for domestic sewage purification
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People's Republic of China
Mechanical Industry Standard
Secondary Air Floatation Filter Water Purifier
JB/T693193
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (P.O. Box 8144, Beijing
Postal Code 100081)
No Reprinting
Copyright
Format 880×12301/16 Printing Sheet 3/4 Number of Words 14000 First Edition April 1994
First printing in April 1994
Print number 00,001-1000
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Price 4.00 yuan
Mechanical Industry Standard of the People's Republic of China
Secondary air flotation filter water purifier
1 Subject content and scope of application
JB/T6931-93
This standard specifies the structural type and basic parameters, technical requirements, test methods, detection rules and marking, packaging, transportation, storage, etc. of secondary air flotation filter water purifier (hereinafter referred to as water purifier). This standard is applicable to the purification of wastewater containing hydrophobic pollutants and pollutants whose specific gravity after adjustment is close to 1, and is also applicable to water purifiers that separate biological mud discharged from various biological treatment equipment from water and purify water. Cited standards
GB3838
GB5659
GB6388
GB8978
Steel pressure vessels
Packaging, storage and transportation pictorial signs
Technical conditions for high-quality carbon structural steel
Surface water environmental quality standards
Technical conditions for multi-stage high-center pumps
Transport packaging, shipping and receiving signs
Comprehensive sewage discharge standards
GB/T13306 signs
Flat-welded steel flanges
JB1037
JB2536
JB2932
Technical conditions for micro-reciprocating air compressorsPainting, packaging and transportation of pressure vessels|| tt||Technical conditions for manufacturing water treatment equipment
3 Structural type and basic parameters
3.1 The model of the water purifier is composed of Chinese phonetic letters and Arabic numerals arranged in the order of category code, characteristic code and main parameters. For example, the water purifier with a processing capacity of 10m\/h is expressed as follows: E
3.2 Structural type
Main parameters, 10m/h
Characteristic code, flotation filtration
Category, secondary sewage water purifier
3.2.1 The main equipment supporting the water purifier includes: pressure dissolved air tank, dosing box, air compressor (or water ejector), releaser, wastewater pump, clean water pump, scraper, clean water flow meter, wastewater flow meter, electrical control box, etc., which constitute a complete set of water treatment equipment. 3.2.2 The working principle of the water purifier is: the wastewater in the wastewater pool or the wastewater after the previous treatment is sent into the water purifier after adding chemicals. After the primary separation, it is approved by the Ministry of Machinery Industry on July 13, 1993 and implemented on July 1, 1994. The schematic diagram of the working principle of the water purifier is shown in Figure 1. After that, it flows into the secondary separation chamber by gravity and then is discharged through the filter chamber. 2
Figure 1 Schematic diagram of the working principle of secondary flotation filter water purifier
1-Steel ladder; 2-Handrail, platform; 3-Scraper control button; 4-Scraper; 5-Secondary flotation filter; 6-Sludge tank; 7-Clean water tank; 8-Clean water pump; 9-Pressure gauge; 10-Safety valve; 11-Pressure dissolved air tank; 12-Liquid level gauge; 13-Electrical control box; 14-Dissolved air water flow meter; 15-Mobile air compressor auxiliary machine 3.3 Basic parameters
3.3.1. Water purifiers are divided into 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100m/h according to the processing capacity, forming a series of products. 3. 3. 2
The basic parameters of the water purifier shall comply with the provisions of Table 1. Table 1 | |tt | 2.9
@2.8×2.9||tt| |43.6×3.1
@3.60X×3.45
@3.70X3.45
@4.20×3.45
Total power
Not more than
When running
Clean water pump
Recommended models of main supporting equipment
Dissolved air tank
Air compressor
1.5GC5×2
1.5GC5 ×2 |
Z—0.05/6Www.bzxZ.net
Q0.3×3.5|| tt||Q0.5×3.7
Q0.6×3.8
@0.6×3.8
Q0.8×4.0
Φ0.8×4.0
Φ0.8×4.0
@1.0×4.0
Φ1.0×4.0
P1.2×4.3
The treated water volume refers to the amount of wastewater entering the water purifier, excluding the return water volume. The return water volume is 40% of the treated volume. If the return water volume exceeds 40%, the treatment capacity of the water purifier should be reduced accordingly. 3.3. 4
In addition to meeting the requirements of Table 1, the pressure-resistant gas tank should not be less than 0.6MPa. When the dissolved air releaser is within the working pressure range of 0.25～0.4MPa, the diameter of the microbubbles released should be 30--G0μm. 4 Technical conditions
4.1 Performance
JB/T6931-93
4.1.1 The pollutant removal rate after purification treatment should meet the requirements specified in Table 2. Table 2
Wastewater types
Electroplating wastewater
Printing and dyeing wastewater"
Papermaking white water
Leather making water
Chemical wastewater"
Oil-containing wastewater
Heavy metal ions such as zinc, copper, nickel, and chromium
Note: 1) Due to the large number of pollutants and pollutant types in various chemical and printing and dyeing wastewaters, the values in Table 2 are for reference only. 4.1.2 The manufacture of water purifiers should comply with the provisions of JB2932. 4.1.3
The selection of water pumps shall comply with the provisions of GB5659. The selection of air compressors shall comply with the provisions of JB1037. 4.1.5 The selection of dissolved gas tanks shall comply with the provisions of GB150. 4.1.6 Under the specified working load, various equipment shall work smoothly without abnormal phenomena. 4.2 Materials
4.2.1 The steel used in the water purifier shall comply with the provisions of GB699 and JB2932. 4.2.2 Other materials shall comply with the provisions of JB2932. 4.3 The cold and hot processing and welding of the water purifier shall comply with the provisions of JB2932. 4.4 Assembly and painting
4.4.1 The quartz sand installed in the water purifier as a filter material should have a particle size of 1 to 2 mm, and the filter layer height should be 300 ± 50 mm. The filter material can also be selected from other filter materials such as PE filter beads, and the filter layer height should be 400 ± 50 mm. 4.4.2 The centerline offset of the inner and outer cylinders of the water purifier shall not exceed 10mm. The maximum and minimum spacing errors of the inner and outer cylinders in the same section shall not exceed 25mm. The straightness error of the inner and outer cylinder walls shall not exceed 10mm. 4.4.3 The paint on the surface of the whole machine shall comply with the provisions of JB2536. The surface treatment (including chrome plating, galvanizing, bluing, etc.) shall not have peeling, rust, obvious spots and other defects.
4.5 The size of the pipeline flange shall comply with the provisions of JB81 flat welding steel flange (1.0MPa). 4.6 The coagulant added to the wastewater, including neutralizer, coagulant, oxidant, shall be determined according to the pollutant composition and pollutant content of the wastewater. For specific agent preparation, please refer to Appendix A (reference).
For the process parameters and test methods of the water purifier, please refer to Appendix B (reference). 5 Test methods
5.1 The water quality test shall be carried out in accordance with the provisions of GB3838 and GB8978. 5.2 The amount of treated water shall be measured by a rotor flowmeter or electromagnetic flowmeter with an accuracy level of not less than 2.5. The smoothness of operation shall be determined by human vision, hearing and touch. 5.3
Inspection rules
Inspection is divided into factory inspection and type inspection. 3
JB/T 693193
6.1 Factory inspection
The inspection of factory products is divided into manufacturing quality inspection and performance index inspection. 6.1.1
6.1.2 Inspection scale: Factory inspection is required for each product leaving the factory. 6.1.3 Inspection items
6.1.3.1 Water purifier manufacturing top quality inspection: The manufacturing quality of each water purifier shall be inspected and qualified by the factory inspection department in accordance with the relevant provisions of this standard and combined with the product drawings, and shall have a product certificate. The main supporting equipment shall also have a certificate of qualification from the manufacturer. 6.1.3.2 Performance index inspection of water purifier: After the water purifier is installed in the user department, the agent is prepared according to the quality of its wastewater. The water quality before and after treatment is tested every half hour according to the provisions of GB3838 and GB8978 to check whether the equipment treatment results meet the requirements of Table 2. If conditions permit, it can also be carried out in the water purifier manufacturer. 6.1.3.3 Use human senses to check whether it meets the requirements of Article 4.1.6. 6.1.4 Judgment rules
6.1.4.1 Those that meet the requirements of Article 6.1.3 can be judged as qualified products. 6.1.4.2 For those that are unqualified, necessary improvements are allowed. If they are still unqualified, they are judged as unqualified products. 6.2 Type inspection
6.2.1 Type inspection should be carried out when one of the following situations occurs. Trial production identification when new products or old products are transferred to the factory. 6.2.1.1
6.2.1.2 After normal production, when there are major changes in structure, materials, and processes that may affect product performance. 6.2.2 Inspection scale: random inspection-unit
The items, inspection methods, and technical requirements for type inspection shall comply with the provisions of Table 3. 6.2.3
Inspection items
Processing capacity
Dirty removal rate
Operation stability
Inspection methods
According to Article 5.2
According to Article 5.1
According to Article 5.3
Technical requirements
According to Article 3.3.2 Table 1
According to Article 4.1.1 Table 2
According to Article 4.1.6
Type inspection can be carried out in the factory where the water purifier is produced, and it is also allowed to be carried out on site. Judgment rules
Those that meet all the requirements are judged as qualified products. For those judged as unqualified, necessary improvements are allowed. If they are still unqualified, they are judged as unqualified products. 7 Marking, packaging, transportation, storage
7.1 Marking
The content of the product marking is as follows:
Full name of the manufacturer:
Product model and name;
Water volume treated
Only one type of wastewater in Table 2 is tested
Main technical parameters of the product: treatment capacity m*/h, total installed power kW, water purifier shape m, weight t; factory number and date.
The contents of the above a.~b. shall be made on metal or polyester signs in accordance with the provisions of GB/T13306 and fixed in the appropriate position of the water purifier
Packaging marking
The shipping and receiving markings of the transportation packaging shall comply with the provisions of GB6388. The packaging storage and transportation graphic markings shall comply with the provisions of GB191. b.
7.2 Packaging
JB/T 6931-93
According to the provisions of JB2536; in the form of naked packaging. 3 Transportation
According to the provisions of JB2536. After packaging, the product can be transported by car, train, ship, or airplane; the conditions for transportation should meet the requirements of moisture-proof and sun-proof; care should be taken not to drop or bump during transportation, and the product should not be inverted. Storage
Storage place: inventory;
Storage conditions: ventilation, dryness, and no corrosive gas invasion; Storage requirements: single placement, vertical placement, and discharge; Storage period: half a year, if overdue, it should be inspected and re-rust-proofed. The following documents should be available when the product is sold:
Product certificate:
Instruction manual;
Certificate and instruction manual of accessories;
Name, specification, and quantity of accessories;
Packing list.
8.2 Provided that the user complies with the conditions for transportation, storage, installation and use of the water purifier, the manufacturer shall guarantee the water purifier for one year (excluding wearing parts) within one and a half years from the date of shipment. During the warranty period, if the water purifier is damaged or fails to work properly due to poor manufacturing quality, the manufacturer shall be responsible for repairing or replacing other parts for the user free of charge. 8.3 Working environment: In cold areas, indoor insulation facilities should be installed; spray cooling should be applied when the wastewater temperature exceeds 45°C. 5
A1 Basic requirements
JB/T693193
Appendix A
Preparation of coagulant
(reference)
Due to the different water quality of industrial wastewater, the types and contents of coagulants are also different. Several formulas should be screened out through small tests and compared with the dosage to select the appropriate one. Then try it out and adjust it in the water purifier. A2 Dosage and variety
A2.1 In electroplating wastewater, when pH>3, use ferrous sulfate and sodium hydroxide. The dosage of ferrous sulfate is 20-25 times the concentration of hexavalent chromium in the wastewater, plus 2-3 times the total concentration of other metal ions. The dosage of sodium hydroxide is adjusted to 7.5-8.5 according to the pH value of the wastewater.
A2.2 For other industrial wastewater, basic aluminum chloride, polyferric sulfate, aluminum chloride, polyacrylamide, aluminum sulfate, ferrous sulfate or various new composite coagulants can be used. At the beginning of the dosage, try to add 50-100 mg/L (calculated as aluminum oxide), and then adjust it to the pH value of the water between 6.5 and 8.5. The dosage should be adjusted to the optimal value in time according to the changes in the water quality of the wastewater and the water quality after treatment. A2.3 For water purification, it is advisable to use refined aluminum sulfate and basic aluminum chloride as coagulants. The dosage is adjusted according to the turbidity of the inlet water. Under the premise of ensuring that the effluent water quality meets the standard, the dosage is minimized. At the beginning, the general dosage is about 5-20 mg/L in terms of aluminum oxide.
A2.4 The addition of chemicals can be done in the front water pipe section to absorb water. The mixing efficiency through the pump blades is high, but it corrodes the pump body. The chemicals can also be added in the outlet pipe section.
B1 Water purifier process parameters
The water purifier process parameters are shown in Table 4.
Return ratio of dissolved air water to waste water
30--40
Note: This table is used for conventional industrial wastewater, B2
Process parameter calculation formula
Residence time in water purifier
15--30
JB/T 5931-93
Appendix B
Process parameters of water purifier
(reference)
Filtration speed
B2.1 The return ratio of dissolved air water to waste water is calculated according to formula (1): f=Q/Q×100
Where: - Return ratio of dissolved air water to waste water, %; Q.—Wastewater treatment volume, m\/h;
Q2-—Dissolved air water flow rate, m/h.
B2.2 The residence time in the water purifier is calculated according to formula (2): h,=V/(Q+Q)×60.
Where: h,—residence time in the water purifier, minV—volume of the water purifier, m.
The filtration speed is calculated according to formula (3):
U=(Q+Q,)/S
Where: U
Filtration speed, m/h;
S Cross-sectional area of filtration layer, m
Filter material backwashing
L/(m · s)
Backwashing time
· (1)
（2）
B2.4 The working pressure of the dissolved air releaser is 0.25～0.4MPa, and the bubble diameter is between 30～60μm. It is also required that the bubble membrane has a certain strength so that it will not burst quickly and separate from the flocs again. B2.5 The filter media backwash intensity is calculated according to formula (4): Q: ×10
SX3600
Wherein: 9~
Backwash intensity, L/(m2, s);
Q3—-backwash flow rate, m\/h.
B2.6 The flushing time can be directly measured with a stopwatch. Additional Notes:
This standard is proposed and managed by the Environmental Protection Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Environmental Protection Science Research Institute of Jiaojiang City, Zhejiang Province and Jiaojiang Environmental Protection Equipment Factory. The main drafter of this standard is Gong Deming
People's Republic of China
Mechanical Industry Standard
Secondary air flotation filter water purifier
JB/T6931-93
Published and distributed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (PO Box 8144, Beijing
Copyright reserved
Postal Code 100081)
No reproduction
Sheet 3/4 Number of words 14000
Format 880×1230
First printing in April 1994
First edition in April 1994
Print number 00,001--1000
Price 4.00 yuan
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