A normal mind; requires knowledge of climate change, forestry, water conservancy, agriculture, logic, macroeconomics, etc. plus own environmental engineering.
I don’t have any qualities myself, haha. I am engaged in forestry management and protection (from the private sector), and now I work part-time in dry water treatment (magnetic separation process - technology from Cambridge, USA), selling biofertilizer (microbial inoculants - decomposing phosphorus, nitrogen, and potassium; improving soil), and I like money. , but not greedy for money - didn't you say: people are alive, money is gone - the most painful thing in life, haha!
I am not a water treatment expert (we have technical support from the Polytechnic Institute). I don’t know the advantages and disadvantages of the A/O process. I only know that the biomagnetization process includes it, right? On the premise of solving high COD and other standards, compared with other traditional processes, the cost is low; the investment is low; the concentration is as simple as a small container, and the land cost is also greatly reduced; the characteristics of magnetic powder accelerate the precipitation (especially heavy metal water) , to increase the speed of sewage treatment; low energy consumption; anyone can see it, and there is nothing to clean or repair. The motor burned out, haha, the manufacturer is not a professional manufacturer. There are also manufacturers of magnetic separation equipment in China, but the core technology is not up to standard, the COD cannot be reduced and the cost is relatively high. Of course, we are now considered domestic, after all, the patents are also placed in China.
If you are willing to understand, you can take a look at the principles
Analysis and comparison of the principles of sewage treatment process
1. Activated sludge method
For a long time, cities Domestic sewage mostly uses the activated sludge method, which is the most widely used biological treatment process in the world. It has the advantages of high treatment capacity and good effluent quality. This method mainly consists of an aeration tank, a sedimentation tank, a sludge return flow and a residual sludge discharge system. The wastewater and the returned activated sludge enter the aeration tank together to form a mixed liquid. The aeration tank is a biological reactor that is filled with air through the aeration equipment. The oxygen in the air dissolves into the mixed liquid, causing an aerobic metabolic reaction, and the mixed liquid is stirred enough to be in a suspended state. In this way, the wastewater contains Organic matter, oxygen and microorganisms can fully contact and react. Then the mixed liquid enters the sedimentation tank, where the suspended solids in the mixed liquid settle and separate from the water. What flows out of the sedimentation tank is purified water. Most of the sludge in the sedimentation tank flows back, called return sludge. The purpose of the return sludge is to maintain a certain concentration of suspended solids in the aeration tank, that is, to maintain a certain concentration of microorganisms. The biochemical reaction in the aeration tank causes the proliferation of microorganisms. The proliferated microorganisms are usually removed from the sedimentation tank to maintain the stable operation of the activated sludge system. This part of the sludge is called residual sludge. In addition to the ability to oxidize and decompose organic matter, activated sludge must also have good coagulation and settling properties so that the activated sludge can be separated from the mixed liquid and obtain clarified effluent. The traditional activated sludge method often has high infrastructure and operating costs, large energy consumption, complex management, and is prone to sludge expansion; the equipment cannot meet the requirements of high efficiency and low consumption.
2. Biofilm method
In the development and application of biological sewage treatment, activated sludge and biofilm methods have always occupied a dominant position. The biofilm method is mainly used to remove dissolved organic pollutants from wastewater. The main feature is that microorganisms adhere to the surface of the media "filter material" to form a biofilm. After the sewage comes into contact with the biofilm, the dissolved organic pollutants are adsorbed by the microorganisms and converted into H2O, CO2, NH3 and microbial cell materials, sewage is purified, and the required oxidation generally comes directly from the atmosphere. The biofilm treatment system is suitable for treating small and medium-sized urban wastewater. The treatment structures used include high-load biological filters and biological turntables. Biological filters are more suitable in southern my country. With the development of new fillers and the continuous improvement of supporting technologies, the biofilm treatment process developed in parallel with the activated sludge process has developed rapidly in recent years. Since the biofilm method has the advantages of high treatment efficiency, good impact load resistance, low mud production, small footprint, and easy operation and management, it is very competitive in treatment, but the initial investment is also huge and the later operating costs are high. .
3. Oxidation method
Oxidation method is one of the most widely used urban domestic sewage pretreatment methods with great development potential. According to the type of oxidant and the type of reactor, the oxidation method can be divided into chemical oxidation method, catalytic oxidation method, (catalytic) wet oxidation method, photocatalytic oxidation method, supercritical oxidation method, etc. Although the chemical oxidation method is simple to operate, its treatment effect is not very ideal and its operating cost is high. Therefore, it is not widely used in urban domestic sewage treatment applications.
In order to improve the treatment effect and reduce operating costs, some other oxidation technologies have been developed. The photocatalytic oxidation method has simple equipment, mild operating conditions, strong oxidation ability, strong bactericidal effect, and thorough treatment. Therefore, it has excellent application prospects in the deep treatment of water and the treatment of difficult-to-biodegrade organic wastewater. It has now become a domestic Very active research topic outside.
4. Loaded flocculation magnetic separation: process changes
BFMS technology adds magnetic powder to the traditional flocculation process to enhance the flocculation effect and form high-density flocs and Increase the proportion of floc to achieve the purpose of efficient decontamination and rapid settlement. The ionic polarity and metallic properties of magnetic powder, as the core of floc, greatly strengthen the flocculation and binding ability of suspended pollutants in water, reduce the dosage of flocculant, and effectively remove suspended solids, especially phosphorus, bacteria, viruses, The effect on oil, heavy metals, etc. is better than traditional technology. Since the specific gravity of magnetic powder is as high as 5.0×10?kg/m?, which is about twice that of sand, the specific gravity of floc mixed with magnetic powder increases, and the floc settles rapidly, with a speed of up to 20 meters/hour or more. The entire water treatment process starts from The water can be discharged in about 10 minutes. The magnetic powder in the sludge is separated using a magnetic drum using the characteristics of the magnetic powder itself, recovered and recycled in the system. The high gradient magnetic filter captures the remaining tiny particles in the flowing water. The magnetic filter is automatically cleaned according to the set requirements to achieve the purpose of highly purifying the effluent. According to reports on the use of BFMS for deep water treatment in the United States, magnetic filters can remove 26 nanometer bacteria. The recycling of magnetic powder greatly reduces the processing cost, coupled with the advantages of its own equipment such as price, flexibility, and versatility. Although it was patented less than a year ago, it has already attracted great attention from the sewage industry.
Under the current severe situation of water pollution and the synergy of favorable national policies, how to make sewage treatment more low-energy, high-efficiency, low-cost, simple operation, flexible operation management and The reuse of treated water is particularly important and urgent. For now, magnetic separation technology is the most economical, most efficient and lowest-cost process. If combined with other processes to achieve breakthrough development in performance, it will surely become the real mainstream in the future.