Magnetic coagulation precipitation separation water purification technology for our independent research and development, production and independent intellectual property rights of the new sewage treatment technology. Magnetic coagulation precipitation separation water purification technology is composed of lifting system, dosing system, flocculation reaction system, magnetic separation system, magnetic intercirculation system, sludge treatment system, with ultrafine separation speed, continuous operation, large processing flux, high purification efficiency technical advantages, can effectively remove all kinds of pollutants in sewage, including SS, TP.
Magnetic coagulation sedimentation is the simultaneous addition of magnetic powder in the coagulation precipitation process, so that it can be integrated with the flocculation of pollutants, in order to strengthen the effect of coagulation and flocculation, and achieve the purpose of high-speed settlement.
Table 1 Technical comparison：
| item | Magnetic coagulation precipitation | Coagulation + inclined plate precipitation | Process comparison |
| Solid-liquid separation form | Magnetic powder is added to the water body to strengthen the effect of coagulation and flocculation, so that the generated floc density is larger and stronger, so as to achieve the purpose of high-speed settlement. | By means of gravity, the suspended matter is added to form alum precipitate to achieve solid-liquid separation effect. | Magnetic coagulation occupies a small area and has high efficiency |
| Floor area（m2） | 50% more than usual | 100% | 50% less floor space |
| Solid-liquid separation efficiency | 15-20min | 30-60min | |
| Effluent concentration (mg/L) | ≤10 | ≤20 | |
| Construction period (days) | ≤30 | 50 | Shorten the construction period by 40% |
| Impact load resistance | strong | weak | |
| Degree of automation | High degree of automation | Low degree of automation | |
| Routine maintenance | Low maintenance | Operation and maintenance is complicated |
Through the above comparison, it can be seen that the treatment efficiency of the magnetic coagulation precipitation separation system is high, and the construction land is saved to the greatest extent, and the land acquisition boundary and coordination difficulty are reduced. At the same time, the magnetic coagulation precipitation system has high process reliability and high impact load resistance for the influent water quantity with large fluctuation range.
1. Principle of magnetic coagulation precipitation process
After the sewage is lifted into the mechanical grid through the lifting system to retain and remove impurities, it enters the magnetic separation and precipitation system. By adding magnetic seed (magnetic powder) to the coagulation system, the magnetic seed is combined with the non-magnetic suspended matter in the raw water under the action of coagulant and flocculant to form magnetic floc. The sewage containing magnetic microfloc enters the homogeneous flow magnetic separation and precipitation system. The homogeneous flow magnetic precipitation equipment adopts uniform water distribution structure design at the bottom to ensure uniform and stable inlet flow rate, uniform water distribution, large water area and large discharge flux per unit area. After the magnetic sludge is defocculted by magnetic force and mechanical force, The magnetic medium and non-magnetic suspended sludge are separated through the magnetic medium circulation system (magnetic seed recovery machine), the magnetic medium is recycled, the non-magnetic sludge flows into the sludge thickening tank, the deep thickening is disposed of by the sludge disposal system, and the supernant is returned to the flocculation system, the pollutants are removed, and the water is discharged up to the standard.
2. Core technology and advantages
The homogeneous flow magnetic separation precipitation system technology is to synchronously add magnetic seed (magnetic powder) in the ordinary coagulation precipitation process, so that it can be integrated with the flocculation of pollutants, to strengthen the effect of coagulation and flocculation, so that the generated flocculation density is larger and stronger, so as to achieve the purpose of high-speed settlement. Magnetic seed (magnetic powder) can be recycled through the magnetic drum.
The residence time of the whole process is very short, so the probability of the reverse dissolution process is very small for most pollutants, including TP. In addition, the magnetic seed (magnetic powder) and flocculant added to the system have a good adsorption effect on bacteria, viruses, oils and a variety of small particles, so the removal effect of such pollutants is better than that of the traditional process. At the same time, because of its high-speed precipitation performance, compared with the traditional process, it has many advantages such as fast speed, high efficiency, small footprint and small investment.
Due to the high-speed precipitation performance of the magnetic separation precipitation system technology, it has many advantages compared with the traditional process, as follows:
(1) The precipitation speed is fast.
(2) High surface load small footprint.
(3) Effective optimization of drug dosage.
(4) High sludge concentration.
(5) Good water effect.
3. Advantages of magnetic coagulation and precipitation technology
(1) High equipment integration, small footprint, low operating costs, fully automatic control, stable operation, can be started or stopped at any time;
(2) The solid-liquid separation speed is fast and the processing efficiency is high.
(3) The system equipment utilization rate is high, the cost is low, and the main equipment cost is saved by 30%;
(4) Modular design, short installation and commissioning cycle.
(5) No intermittent continuous operation, large processing flux, high purification efficiency technical advantages, greatly shorten the hydraulic residence time, for the reduction of the area of engineering facilities to provide technical support. The technology has been widely used in the fields of water quality improvement, water environment treatment, rainwater purification, construction wastewater treatment, upgrading of sewage treatment plants, and black and odorous water treatment.