I am BFMS process equipment salesman, the following is our proposal (picture paste not on)
BFMS water treatment process technology
20000 tons / day municipal wastewater treatment technology proposal
1, the project overview
Wastewater treatment plant's daily treatment capacity is 20000 tons/day, designed effluent quality to reach Class I B standard (temporary)
2, project scale
Normal treatment capacity: 20000 tons/day
Peak treatment capacity: 24000 tons/day
3, design of incoming and outgoing water quality
1) Incoming water quality (need to be provided by the owner of the actual data)
PH= 6~9; CODcr≤500mg/L; BOD5≤280mg/L;
Suspended matter≤300mg/L; total phosphorus≤5.0mg/L; ammonia nitrogen≤40.0mg/L
2) effluent water quality (need to be provided by the owner of the effluent standard, tentatively set at Class I B)
PH=6~9; CODcr≤60mg/L. BOD5≤20mg/L;
Suspended solids≤20mg/L; total phosphorus≤1.0mg/L; ammonia nitrogen≤15.0mg/L;
Total nitrogen≤20.0mg/L; fecal coliform bacteria≤10,000/L.
4. Principle and advantages of loading flocculation and magnetic separation (referred to as BFMS) process
BFMS technology In the traditional flocculation process, magnetic powder is added to enhance the effect of flocculation, form high-density flocs and increase the specific gravity of flocs to achieve the purpose of efficient decontamination and rapid settlement. The ionic polarity and metallic properties of magnetic powder, as the nucleus of the floc, greatly strengthen the flocculation binding ability of suspended pollutants in water, reduce the dosage of flocculant, and the effect is better than the traditional process in the removal of suspended matter, especially in the removal of phosphorus, bacteria, viruses, oil, heavy metals and so on. As the specific gravity of magnetic powder is as high as 5.0×10?kg/m?, about twice as much as that of sand, the specific gravity of floc mixed with magnetic powder increases, and the floc settles rapidly at a speed of up to 20 meters/hour or more, and the whole water treatment can be completed in about 10 minutes from water inlet to water outlet. The magnetic powder in the sludge is separated and recovered by using the magnetic drum with the characteristics of the magnetic powder itself and recycled in the system. The high gradient magnetic filter captures the residual particles in the water, and the magnetic filter is automatically cleaned according to the set requirements to achieve a high degree of purification of the water. According to a report on the use of BFMS for deep water treatment in the United States, the magnetic filter can achieve results of 26 nanometer germ removal. The following diagram illustrates the BFMS process.
BFMS Process Loaded Flocculation Magnetic Separation
Flocculation/ + Loaded Flocculation + Sedimentation Separation + Magnetic Filtration
Coagulation + Baiiasted Flocculation + Solids Separation + Magnetic Separation
This process was rarely used in engineering because the recovery technology of magnetic seeds has not been well solved, but now this technical difficulty has been successfully broken through, and the recovery rate of magnetic seeds reaches more than 99%, this process technology in the U.S. has also carried out the project demonstration and commercial project operation. Our company has applied for a number of patents in China, forming the company's own intellectual property rights. In the past three years, our company has successfully conducted a number of tests with different operating parameters in the areas of municipal wastewater treatment, water reuse, surface water and groundwater and tap water treatment, river water, lake water, river water treatment, high-phosphorus wastewater treatment, papermaking wastewater treatment, mining wastewater treatment, oil refining and oilfield wastewater treatment with a 250-ton/day pilot plant, with very good results; the 10,000-ton/day pilot plant has been completed in May 2007, and the process is now in operation in the United States. The test vehicle has been put into operation for one month in May, 2007 in Qingdao Licun River estuary city sewage, running well. In Beijing Jinyuan Jingkai wastewater treatment plant effluent in addition to high phosphorus depth treatment run for more than a month, the treatment effect is good. As the Olympic Games emergency municipal wastewater treatment project, installed in Beijing Qinghe Sewage Treatment Plant 4 × 10,000 tons / day and 2 × 5,000 tons / day **** 6 groups of BFMS system, the comprehensive treatment effect is good. The technology is applied in Shengli Oilfield to treat oil recovery wastewater in the first phase of the Dongying Shengli Oilfield project (5000 tons / day) has been put into use, the oilfield 500 tons / day groundwater BFMS project and 30,000 tons / day of oil recovery water BFMS project is also in the implementation.
Compared with other processes, the magnetic separation technology has the following advantages:
1) The BFMS process can be applied to primary, secondary and tertiary municipal wastewater, mid-water and all kinds of industrial wastewater as well as drinking water.
2) The treatment effect is good, its effluent quality is comparable with the ultrafiltration membrane effluent, BFMS process can effectively remove from the water particulate pollutants, microbial pollutants and some pollutants that have been dissolved in the water, such as: COD, BOD, suspended solids, total phosphorus, chromaticity, turbidity, etc., especially on the phosphorus has a strong removal effect. Can also be combined with biological processes very effective and economical nitrogen removal.
3) Strong impact load resistance, unique impact resistance to the impact of water quality. When the former section of the process failure, or other harmful metal ions into the sewage treatment system, sewage can be directly into the magnetic separation system, the system is still able to maintain a high removal effect, substantial removal of pollutants in the water.
4) Occupies a very small area, 20000 tons / day BFMS system occupies an area of about 400 square meters, plus aisles, dosing and operation facilities occupy a total area of about 700 square meters.
5) low investment, than the membrane treatment has obvious advantages.
6) low operating costs, long service life of the equipment, in addition to normal maintenance, without the replacement of components resulting in high secondary investment.
7) convenient operation and management, quick start, simple operation and management.
5, sewage treatment plant process design recommendations
According to the engineering operation experience, to remove floating debris and silt in the sewage, to ensure the continuous operation of the sewage plant, the sewage into the BFMS system for pre-treatment is necessary. According to the working principle of the BFMS system, the conventional pretreatment can be, that is, coarse and fine grating and sedimentation tank. Pre-treatment can also consider the use of sewage crushing pumps.
BFMS technology has a strong ability to remove phosphorus and suspended solids, as well as other indicators (except nitrogen). For the treatment of municipal wastewater, due to the poor nitrogen removal ability of BFMS technology, it is recommended that the subsequent biochemical processes (such as BAF, SBR, A/O, etc.) are designed only according to the load of ammonia and nitrogen, and by adjusting the dosage of the BFMS system, it can be ensured that the remaining CODcr and BOD5 meet the discharge requirements. Since biochemical denitrification requires necessary carbon source, if the removal rate of BFMS system is too high, it will lead to insufficient carbon source of biochemical system, slow growth of microorganisms, and denitrification capacity can not be reached, therefore, it is recommended to pave a backup piping system for the sludge storage tank, and the return flow of sludge is used as a backup carbon source.
6, process flow
Considering the water quality characteristics of municipal wastewater, combined with the process advantages of BFMS technology, and taking into account the investment and operating results, it is recommended that the process flow of the sewage treatment plant is as follows:
Municipal wastewater
Regularly exported
Discharge to the standard
BFMS technology is an important part of the wastewater plant treatment process. Part of the BFMS system excludes the residual sludge must be treated.
The following figure is only the BFMS process flow diagram:
Water from the sewage plant Outgoing water
Sludge dewatering system
The BFMS system plan layout is as follows:
7, BFMS system design
1) BFMS system ****2 sets, a single set of capacity of 10,000 tons / day.
2) Other
(1) BFMS system is recommended to be placed indoors, the equipment space requirements L30 × W20 × H10 meters, in the form of light steel structure.
(2) Sludge treatment is not recommended to use thickening tank, directly using the sludge storage tank and sludge thickening and dewatering machine, to deal with the remaining sludge discharged from the BFMS system. The water content of the sludge discharged from the BFMS system during normal operation is 98-99%.
(3) The supporting voltage is 380V, the installed capacity of each set of BFMS system is 61KW (excluding water inlet pump), and the running load is 40KW. the total installed capacity is 122KW, and the total running load is 80KW.
(4) The operators of each set of BFMS system are 1 person per shift, and the operators are required to undergo the training in the 4-shift 3-operation.
(5) Sludge production: 0.4kgGS/m?wastewater.
8, BFMS system water treatment costs
1) direct operating costs: 0.2446 yuan / ton of wastewater
A chemicals:
Flocculant dry powder (29% purity): 2500 yuan / ton; casting concentration of 20 ppm (AL2O3), the cost of 0.17 yuan / ton of wastewater;
PAM crystal PAM crystal: 25000RMB/ton; dosing concentration of 1ppm, the cost is 0.025RMB/ton of wastewater.
B electricity consumption
0.041 degrees/ton of sewage, electricity cost at 0.57 yuan/degree, the cost is 0.0234 yuan/ton of sewage.
C Labor:$0.014/ton of sewage
D Repair and maintenance $0.012/ton of sewage
2)Total cost:$0.3244/ton of sewage
A Direct running cost:$0.252/ton of sewage
B Depreciation of fixed assets (average life method) for 15 years:$0.052/ton of sewage
C Operation and management and other costs:$0.031/ton of sewage
9, 20,000 tons/day BFMS system investment
This project *** need 2 sets of 10,000 tons/day BFMS system, 20,000 tons/day BFMS system investment is ******** (including design, installation, commissioning and system equipment).
10, Note:
* Due to the actual sewage conditions are not known, no water test, so the operating costs of the BFMS system is only an estimate, the specific data need to be done after the test to determine.
*The content of this paper is for internal use only.