: Magnetic separation technology has become an emerging sewage treatment technology. Magnetic separation has gained many successful applications in water treatment and shows many advantages. It is of great advantage to apply this technology to the treatment of rural wastewater and black-odor water as detailed below.
First, the town sewage treatment: the status quo harsh, a lot of difficulties
In the past 10 years, the economy of small towns in our country has developed rapidly and the quality of people's life has been significantly improved. However, economic development is not synchronized with environmental protection. Along with economic development, along with the transfer of urban pollution, the long-term lack of overall planning of towns and villages has caused the problem of environmental pollution becoming increasingly serious. Urban sewage treatment is troubled township ecological environment, a major problem. For a long time, the economic development model of dual system led to the obvious superiority to townships and rural areas in many aspects such as planning, capital, talents and so on. The per capita expenditure of drainage in our country is far lower than that of urban per capita drainage expenditure. In the future construction process, the planning and construction of infrastructure for township and town sewage all need a lot of inputs such as financial, human, material and institutional guarantees to gradually narrow the gap between urban and rural areas.
About 20% of our cities still have direct and overflow effluents, which is the main crux that causes 80% of the black and smelly rivers and lakes. Sewage in villages and towns inhabited areas is directly discharged into ditches, rivers and lakes, causing the people in the area to be deeply affected by the dark and smelly rivers and lakes.
At present, the difficulties of rural sewage treatment in our country are mainly the following aspects: (1) Widely distributed and dispersed. The main domestic sewage, non-point source, scattered emissions, the existing septic tank leakage serious. (2) Unstable sewage discharge. Intermittent emissions fluctuations, as early as midnight cooking time sewage discharge higher than other periods. (3) high investment and construction costs. In the past, most of the domestic sewage in villages and towns adopted the centralized engineering mode. The preliminary procedures were complicated and contained a large investment in pipe network. The time and construction cost were high. (4) complex operation and management. After the village sewage treatment project is put into operation, it has higher requirements on operation, maintenance and management, and insufficient matching with the existing manpower, resulting in the stagnation of more projects.
Second, black and smelly water governance: policy plus code, the market demand outbreak
National black-odor water treatment policies continue to increase demand. April 16, 2015 promulgated the "Action Plan for Water Pollution Prevention" ("Water 10") made it clear that: By 2020, prefecture-level cities and above built black odor water body control within 10%; to 2030 urban black Smelly water is eliminated. Provinces and municipalities have also introduced black foul water treatment related documents. Under the double pressure of public concern and policy overweight, it is urgent to declare war on black and smelly bodies of water. Ring technology magnetic separation technology in this area more widely used. On September 5, 2016, the Ministry of Housing and Urban-Rural Development and Printing promulgated the Technical Guidelines for the Treatment of Urban Black-Smeared Water-Drainage Ports, Wells and Inspection Wells (for Trial Implementation), and clearly listed the magnetic separation technology as the recommended technology.
By the end of 2014, Huaneng Science and Technology's leading product - magnetic separation technology, won the second prize of national science and technology progress. Its core technology "complete sets of ultra-magnetic separation water treatment equipment," and "complete set of technical equipment for disk purification wastewater" has a small footprint, investment, low operating costs, large amount of water treatment, effluent quality, high sludge concentration, management and maintenance Convenient and other significant features, has been widely used in coal mining, landscape, municipal, petroleum, electricity, metallurgy, paper making, printing and dyeing and water pollution emergency treatment, water supply pretreatment and other fields.
In practice, the technology of suspended solids, COD, phosphorus, algae removal rate is very high, the application is very good, especially the sensory improvement. Foul, turbid watery black body, through magnetic separation technology, the water is particularly clear, refreshing, and the entire operation of the residence time is very short, about 4-6 minutes. "A turn of the machine, clear water reproduction", these eight words a good summary of the characteristics of magnetic separation technology. In addition, the application of this technology in the standardization of sewage treatment plants can well remove phosphorus and suspended solids.
Third, the typical technology: MagBr-MBBR
The technology is suitable for residential communities, schools, hotels and small enterprises and rural and small towns sewage treatment and reuse. Including the magnetic carrier biological moving bed reactor, hydrophilic magnetic suspension filler, coagulation and sedimentation enhanced dephosphorization, which is the core of the ring technology company's technology part, to ensure that the water quality indicators to achieve a level A standard.
The main technical advantages are: (1) strong impact resistance. Anti-water quality, water, water temperature impact ability, can quickly adapt to changes in water quality. (2) low energy consumption. High oxygen utilization, energy conservation, saving more than 30% of electricity consumption than the traditional process. (3) low maintenance costs. Non-blocking bio-filler, low loss, long-term use without replacement filler. (4) simple operation. Equipment automation, easy to operate, remote monitoring, without professional full-time personnel management. (5) Small footprint. High degree of integration of equipment, small footprint, saving more than 50% of land use than the traditional process. (6) short construction and commissioning period. Equipment integration, construction and installation of fast, than the traditional process to save 40% of the time. (7) flexible structure, various forms. To adapt to rural areas and do not have the conditions of transport, to meet the ground, buried, semi-ground and other forms of equipment needs.
Fourth, the application of magnetic separation technology and case
When the problems of urban sewage treatment plants were solved, people began to pay attention to the comprehensive treatment of water environment and sewage treatment in rural areas and small towns. Today, this industry has developed and everyone has come together to this stage. Beautiful countryside may have real content. Village tourism, as well as other characteristics of towns and villages, to attract urban people to return to the village, if the town cross-flow of sewage does not meet the connotation of the beautiful countryside. Huaneng Science and Technology in this area to explore some of the technologies and cases for the country and the new phase of environmental protection has made some contributions.
Chongzhou 10 villages and towns in rural life sewage contiguous control project
According to the 2015 Chengdu Economic Outlook, the main tasks of Chengdu in 2015 are to vigorously implement the contiguous rehabilitating project in rural areas, carry out pollution control of rural domestic sewage and livestock breeding and improve the quality of rural ecological environment. Deepen the prevention and control of water pollution in key river valleys. Strongly promote the total emission reduction of pollutants to ensure the smooth completion of the "second five" total emission reduction targets and tasks. As a county-level city under the jurisdiction of Chengdu Municipality, at present most of the cities and towns in Chongzhou use natural ditches to discharge and have no sewage treatment facilities, resulting in different degrees of pollution of water resources and the environment and seriously affecting people's livelihood. In order to deepen rural reform and promote new rural construction, Chongzhou Municipal Government attaches great importance to the improvement of rural environment, especially the treatment of rural domestic sewage.
According to the actual situation on site, Huaneng Science and Technology adopted MagBr-MBBR integration technology to implement contiguous sewage treatment in 8 towns and 2 townships such as Saburo and Yuantong in Chongzhou, and constructed 18 sewage treatment facilities, A total of 1925m3 / d treatment of water to avoid direct sewage pollution of the environment. Processing size of 50-150 tons.
So, what is the effect of MBBR system processing? Through the comparison of water inlet and outlet water, the project construction and operation and maintenance more than a year since, the effect is indeed better. The influent COD content of the project is about 100-300mg / L, and the intermittent difference is very large. However, after the system treatment, the effluent water can reach 50mg / L; the influent water content in the BOD system is about 1
Combined Flow Closed Cooling Tower
Closed Cooling Tower is operated by circulating water or fluid, which is divided into two closed loops.
1. Circulation in the tower: the circulating water or fluid passes through the hot zone environment. After the water temperature rises, it enters the surface cooler in the tower, and the heat is sent to the environment outside the tower through the surface cooler and ventilation fan. The cooled circulating water or fluid is sent to the heat source by the water pump.
2. Circulation outside the tower: the spray water is sent to the spray system by the water tank through the water pipe. After spraying, the spray water first exchanges heat with the filler, so that the spray water can be cooled rapidly. At this time, the water contacts the surface of the surface cooler for heat exchange. Part of the hot steam is discharged through the ventilation fan, and the cooled spray water drops to the water tank for secondary circulation to form an external circulation for cooling.
Combined Flow Closed Cooling Tower,Bac Cooling Tower,Cooling Tower Systems,Chiller Tower
Wuxi Ark Fluid Science Technology Co., Ltd. , https://www.fangzhou-arkfluid.com