Simple analysis of polyacrylamide and water treatment industry

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2015-10-31 06:59:59

At present, the proportion of wastewater discharge and treatment in our country is serious, and the water resource problem is increasingly serious. It also explains the huge space of development of water treatment industry.

At present, China's annual wastewater emissions of about 365 tons, the annual processing capacity of only 100 tons, the treatment rate is less than 1/3. The current water treatment market in the world, including inorganic flocculant polyferric chloride, has a market share of more than 3/4. Although China's water treatment agent industry has already had a certain scale and level, but still can not meet the requirements of a large number of industrial wastewater and civil water treatment, compared with foreign advanced level there is no small gap. Industry is expected in the next few years the production of domestic water treatment agent will have a rapid development, the annual demand will reach 300000 tons, of which the amount of flocculant is 180000 tons.

The United Nations has issued an alert on the shortage of freshwater resources: "the problem of water shortage will seriously restrict the economic and social development in the next century, and may lead to conflicts between countries". The report, entitled "comprehensive assessment of the world's freshwater resources," said the current population of more than 1200000000 people in the world, that is, people are facing the pressure of a high degree of water shortage ". The report also predicts that by 2025, the world population will surge to 8300000000, the world will have a 1/3 population suffer from a high degree of water shortage pressure".

In January 20, 1997, the United Nations issued an alert: "water shortage problem will seriously restrict the economic and social development in the next century, and may lead to conflicts between countries". The report, entitled "comprehensive assessment of the world's freshwater resources," said the current population of more than 1200000000 people in the world, that is, people are facing the pressure of a high degree of water shortage ". The report also predicts that by 2025, the world population will surge to 8300000000, the world will have a 1/3 population suffer from a high degree of water shortage pressure".

With the development of industry and the rapid growth of population, the shortage of fresh water has caused widespread concern in the world. China's water resources in the world, but the per capita amount of water is only 1/4 of the world's per capita water, 109, and the time and space distribution of fresh water resources and uneven distribution of the population, social development is uneven, resulting in serious shortage of freshwater resources in some cities. At present, there are more than 300 cities in the country, more than 50 cities in serious water shortage. Shortage of fresh water resources has seriously affected the lives of people and economic development in these areas, causing direct economic losses of hundreds of billions of dollars a year.

Into twenty-first Century, China's population continues to grow, will reach 1600000000 peak, the development of soil resources will reach the critical state, the water demand will further increase. 1993 national industrial and agricultural production and urban and rural residents living water has reached 525000000000 m3, per capita water consumption 450m3. According to population growth, industrial and agricultural production and development, such as not to save water, the initial estimate in 2030 to increase the supply of 2000 ~ 250000000000 M3 to meet the needs of all aspects of. Three Yellow River, Huai River, Hai River basin after 2010, with the increase in population, per capita water resources will be less than 400m3, local water has no potential to be tapped, the water only long distance from the Yangtze River water transfer to is solved. The long distance water transfer costs, investment, financing difficulties, and also by social and environmental constraints, the implementation of the project is very difficult. Therefore, the first need to use a variety of high-tech, by saving water, using rainwater, sewage treatment reuse, water use and other ways, do everything possible to improve the efficiency of agricultural and agricultural water.

With the rapid development of industrial and agricultural production and the improvement of people's living standards, the demand for water is increasing. At the same time, water pollution is becoming increasingly serious. China is one of the countries with poor water resources, the per capita amount of water per capita is only 1/4, and there are more than 300 cities in China at present, and the daily water shortage is about 10000000 cubic meters, which seriously affects domestic industrial production and people's life. Industrial water consumption is generally accounted for 70%-80% of urban water, water consumption, reasonable treatment by all walks of life are generally concerned, the demand for water treatment agent is also increasing. Polymerization ferric chloride and polymeric aluminum chloride, polyacrylamide, aluminum salt with floc formation speed, alum flowers dense, settlement speed, good treatment effect for high and low turbidity raw water, suitable pH value of a wide range of characteristics, but also removal of organics, suspended solids, heavy metals, sulfides and carcinogens, free iron ions in the aqueous phase shift, decolorization, oil removal, deodorization, sterilization function significantly and cheap price, compared with other purifying agent, a strong market competitiveness and the economic benefit is also very obvious, it is worth popularizing and applying.

In the process of mining, a large amount of water is usually used, and it is often used to reclaim the useful solids in the water, and the waste water can be purified and recycled. Application of polyacrylamide flocculation can promote aggregate sinking, the clarification of liquids and mud cake dehydration, which can improve production efficiency, reduce loss of tailings and water consumption, reduce equipment investment and production cost, and avoid environmental pollution. Uranium extraction is one of the most important application fields of polyacrylamide, and it is very effective to add the polyacrylamide in the concentration and filtration of the leaching process when the leaching of uranium ore is leached by acid or sulfonate. Polyacrylamide in the mining industry is very extensive, not only can separation of minerals and ores, can also used as a flocculant in wastewater treatment, and sealing mining pipeline. Due to the complex pricing structure, South America cobalt, coal, copper, gold, diamond and iron ore market demand is also rising, which will promote the growth of the global polyacrylamide market.industry is a large water, if the production of waste water without treatment and direct discharge, it is bound to cause water pollution, how to deal with the requirements of mining waste water has become the primary consideration of mining enterprises. In this paper, we introduce the treatment of mineral processing wastewater with flocculant and its effect.

Mining industry of the mine water mainly accompanied by mining the surface infiltration water, mine water, rock pore water, underground water aquifer dewatering, and the material is discharged into the water will cause water pollution, filling, filling water, underground production dust, filling selected refinery and coal washery sewage depends mainly on the nature of the material and the concentration in the wastewater, containing the water is the main source of mine wastewater. Generally, the mine water pH value in the 7~8, is weakly alkaline. But mine water containing sulfur, the SO42 more, mostly acidic water. Acid mine waste water is a sulfide mineral deposit in the mining process is oxidized and produced by pH less than 6.5 of the mine waste water, its PH is generally 3 - 6.5, total acidity. Acid mine water not only corrosion underground drainage equipment and other mining equipment, resulting in economic losses, but also affect the health of the workers in the mine, the concentration of some heavy metal ions in the acid mine increases with the increase of acidity, the toxicity is also increased, the potential damage to biological.

At present, the treatment of acid mine water is mainly limestone, lime neutralization method, biological chemistry method, wetland ecological engineering treatment method. The lime neutralization method is a common method for treating acid water in coal mine. Its main advantages are simple process, convenient operation, and the effluent pH can reach the discharge standard, but it is very easy to produce a large amount of solid waste, resulting in two pollution.

With the development of science and technology, mineral processing wastewater, slag accumulation leaching water can use some chemical products to the suspended solids and heavy metals and other harmful substances, such as the successful treatment, and even reach zero emissions, direct use of treated water recycling! Polyacrylamide flocculant is generally used to treat acidic waste water music Bangjing suggested that mines, commonly used is anionic polyacrylamide and nonionic polyacrylamide and its molecular weight reached 14 million more than the effect of better, the degree of hydrolysis to according to the main component to determine the pH value of wastewater and the wastewater.

Special polyacrylamide flocculant for treatment of mine wastewater can promote the rapid settlement of the effective solid material, or accelerate the concentration of fine objects, improve the effect of solid-liquid separation, reduce the loss of tailings and environmental pollution, reduce production costs. Under normal circumstances, the process of mineral processing, the need for high molecular weight polyacrylamide, so that better guarantee the sedimentation rate, the centrifugal process will be better, more easy to achieve better economic effects.