[ is ] China’s reform and opening up more than 30 years, GDP average annual growth of more than 10%, has become the world’s second largest economy. But our workers, agricultural growth is basically the expense of the environment come. Although the state attaches great importance to environmental protection, to develop a series of laws (Environmental Protection Law, Water Pollution Control Act, Air Pollution Control Act, etc.) and various rules and regulations on environmental protection in China has played a certain role, but today China’s environmental protection situation is still grim, can not be ignored!
now how about our water situation? due to our rapid development and environmental protection lag, so the extent of the water quality of water sources contaminated more serious.
water pollutants and their harmful
First, the three major sources of water pollution
1, industrial pollution: from the most backward chemical workshop to the most advanced chemical enterprises , industrial production emit large quantities of untreated water, gas, slag and other hazardous waste, seriously damaged the living environment and natural resources, biological, but also directly endanger human health.
2, agricultural pollution: livestock farms large amounts of waste, farmland of large quantities of fertilizers, pesticides, herbicides, pollution of the COD accounted for 40% of the country.
3, pollution of city life: urban population growth, some as yet no sewage treatment plants, although there are some treatment plants, but not with the pipe, resulting in a large number of sewage directly into the river.
Second, the type of pollutant
1, the inorganic particle contamination
In certain heavy metal ion contamination of areas, such as areas serious Xiang, North River Basin like. Heavy metal ions is generally mining, smelting process emissions. Among them, small mining, smelting indigenous more dangerous.
Each smelter not seriously addressed by the run, run, drip, leak, so that the factory water containing a higher concentration of heavy metal ions, and no downstream municipal water warning means can not take measures (e.g., adjusting the PH value, chemical precipitation), it does not take steps (to process all the water), long-term drinking, including accumulation, hazardous to health.
2, organic pollution
In recent decades are millions of human synthetically produced organic material, which both benefit mankind, and also causes various diseases human scourge, such as pesticides, insecticides, sterilization, herbicides, plastics additives.
Third, persistent organic pollutants (POPs)
persistent organic pollutants (POPs) refers to a human synthetic lasting in the environment, by accumulating the food chain (network), and cause deleterious effects of chemicals on human health and the environment. These materials resistant to degradation in the environment, the longer retention time, can affect by the atmosphere, the water delivered to the regional and global environment, and through the food chain, that seriously affect human health.
Fourth, endocrine disrupting chemicals (EDCs)
endocrine disrupting chemicals (EDCs) generally has similar structural or functional hormone analog can be combined with hormones receptors, thereby interfering with the organism the normal physiological function. Endocrine disruptors are mainly pesticides, herbicides, sterilizing agents, paints, plastics and the like by the solid. Typical contaminants include estradiol, bisphenol A, nonylphenol, phthalate esters and the like.
hazard endocrine disruptors comprising: an interference reproductive system and the normal development of an organism, or reproductive function decrease abnormal physiological phenomena; interfere with the normal function of the immune system, reduce the immune system of an organism, carcinogenic, easy induced tumors; interfere with the normal function of the nervous system development, damage to the nervous system resulting in loss of control behavior and other anomalies.
Fifth, pharmaceuticals and personal care products (PPCPS)
pharmaceuticals and personal care products (PPCPS) as a new class of environmental pollutants began in the 1990s caused public concern.
PPCPS include a variety of prescription and non-prescription drugs or cosmetic for human health care, such as antibiotics, antiinflammatories, antipyretics, analgesics, anticonvulsants and anxiolytics, cell growth inhibitors, disinfection fungicides, hormones and oral contraceptives, lipid regulating agents, perfumes, cosmetics, sunscreens and nutritional products.
PPCPs goods organisms living tissue will have a strong biological activity, to produce a specific biological effect. Long-term exposure to water, it is possible to make drug-resistant bacteria and viruses, these microorganisms enter the body will bring potential harm to humans. In both domestic and foreign reports, because of the abuse of antibiotics lead to antibiotic ineffective the case of death of patients.
From the results of the current domestic and foreign research analysis, in-depth where the water treatment process, suffered emerging contaminants (includingPOPs, EDCs, PPCPs) threatening risk is small, without the risk of advanced treatment of a variety of organic contamination by conventional processes large.
then for the overall transformation of China’s water resources, which requires changes in national investment and economic structures for environmental protection, so our water will be able to gradually change, so I do need to change the source water 30 New Year 50 years good time, environmental quality, and it will get better.
of the depth of water purification water purifier provides a broad space
90% of the country’s waterworks or conventional water treatment processes, is a century-old, 100 years ago to go with the process water supply treated water for 100 years, apparently powerless. Experiments and actual production results at home and abroad show that the conventional water treatment processes can only remove about 30% of the organic matter in water, and for some pollutants, particularly chemical pollution, little change before and after treatment. Therefore, the current drinking water there is a big security risk.
In this case now, we are missing two main water treatment technology, an oxide, another adsorption, we have used are chlorine, prechlorination oxidized, but the addition of after chlorine disinfection by-products increases, and increases the possibility of cancer. So, now it is more seriously. What use is it, with potassium permanganate, ozone, chlorine dioxide, as well as bio-oxidation. Adsorption of it, now is the best activated carbon, resin as well as other things that a small amount of a molecular sieve. We now advocate Waterworks must use activated charcoal, activated carbon to adsorb organic pollutants because of small molecules, and coagulation, sedimentation, filtration old can not afford to go three sets, after the oxygen consumption of activated carbon were using the water we can achieve 3mg / L or less. Currently activated carbon combined with our nation’s water quality will not be long saturated. Water treatment technology development trend of the future should be the conventional treatment + membrane technology.
according to the national drinking water quality standards 106, if they can meet the standards, is safe! The problem in the building area is often affected by secondary pollution, water quality, the chlorine, E. coli, turbidity exceeded .
Quality criteria specified in each index value, a red value (a pass line), can not exceed limits. Some of the content of contaminants as possible indicators, such as: oxygen consumption CODMn instead of the organic pollution; represent some impurities in the water turbidity and colloidal microorganism; toxicological indicatorsSome heavy metal ions with toxic and harmful organic matter content, more water should be better.
Water typically is to achieve a plant effluent water quality standards, water fed out to meet safety requirements households people it is impossible to satisfy everyone’s cleanliness and the higher the water extract . As people on the water, the water quality requirements higher and higher, while economic development, income increase, with a certain economic conditions. People are more willing to drink clean water, more suited to their water, therefore, turn to choose their own requirements water purifier is the inevitable trend.
about the water industry, I think the water is still the mainstream. Tap water purifier is added, it is an extension of tap water. Now water industry has developed rapidly, it is understood, a 30% growth per year, which is related with the status of our tap water. At present quality of drinking water a considerable part of our town has not yet reached the national standard of 106, in this case, as a complement and extension of the water, we should say that the water industry is promising. That is, the water quality has reached the 106 standard, my view is up to standard only pass, only 60 points. With the improvement of living standards, and concerns about drinking water and health, people want their drinking water is 80 points, 90 points level. I think, for the quality of drinking water, you can not be overstated how to improve, because now we do not fully know exactly the type and quantity of pollutants in water. We are now talking about is that we can measure out. However, with the development of micro-technology, and analytical instruments increased. We will continue to find new pollutants, so I think the drinking water quality standards should continue to modify and improve, constantly adding new content.
purifier can be filtered, multi-organic pollutants, you use of activated carbon from membrane, high hard water softening is necessary, if you will drink with high purity water nanofiltration, reverse osmosis (RO). These processing techniques can greatly improve the quality of water. However, the activated carbon must be used, because we now organic pollutants in tap water standard is 3mg / L, you can handle him from 3mg / L to 1mg / L or less, drink less than to go into a good drink.
So I think, is the standard of tap water, water purification industry still has much room for development, because people increasingly high demand for drinking water, you can meet his needsYou will have a good development. Water industry will be promising.