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What is the solution of water pollution from YUCHENG YUAN's blog

Water SOURCE PROTECTION: IN ORDER TO CONTROL WATER SOURCE pollution, THE development of seriously polluting industries within the water source basin shall be prohibited to reduce the discharge of pollutants. However, from the current momentum of economic development and the actual situation of relevant national laws and regulations and enforcement efforts, it is a very serious issue to improve the water quality in the short term, and there will be a long process.

Renovation of PROCESS equipment in waterworks: THE renovation of waterworks can improve the quality of tap water to a certain extent, but it can't solve the problem fundamentally, especially the secondary pollution of pipes. And the reform cost is huge. From the current situation of our country, we can foresee the renewal of equipment and technology of waterworks and the whole transformation of waterworks in 10 to 20 years is difficult to realize.

Pipeline split water supply: There are many problems in pipeline split water supply due to its engineering cost, design and construction, management and maintenance, water charge collection, sanitation index and safety degree. In addition, the pipeline water supply can only be applied to new buildings. For a large number of our existing residential communities, the water pollution problem cannot be solved because of the re-laying of pipes.

Water PURIFICATION AT THE end OF the HOUSEHOLD pipe network: WHO research shows that the most effective way to enjoy healthy water is to install a water purifier at the end of the municipal pipe network, namely the household water terminal, to purify tap water.

1. Biological method

The treatment of includes internal environmental treatment and external environmental treatment. The former is the treatment of pollution sources, which is difficult and costly. The latter is the treatment of water pollution by using the purification ability of natural environment. Biological purification is an important means of external environment governance. It is a water pollution treatment method which accords with the situation of our country.

Because there are biological species everywhere on Earth that can participate in purification activities, they absorb, accumulate, decompose and transform pollutants through their own unique metabolic activities, reduce the concentration of pollutants, make toxic substances become non-toxic, and finally meet the water discharge standards. Therefore, the use of biological sewage purification by people's attention. The specific method is as follows.

(1) precipitation treatment method (2) aquatic biological culture method (3) biological weighing method (4) activated sludge method (5) biofilm method (6) biological contact weighting method (7) land treatment system (8) immobilized cell method

2, physical method (cellulose based adsorption method)

There are many ways to treat water pollution by physical method, including membrane engineering method and adsorption method. Among them, the adsorption method is the most important because of its diversity, high efficiency, ease of handling, reusable, and possibly low cost. Activated carbon is now the most widely used adsorbent, mainly used to adsorb organic matter, can also be used to adsorb heavy metals, but the price is relatively expensive. Magnetic alginate can adsorb not only organic arsenic but also heavy metals. As a biosorbent, chitosan can adsorb heavy metal cations and harmful anions in different environments. Bone carbon, aluminum salts, iron salts and rare earth adsorbents are effective adsorbents of harmful anions. Rice husk, modified starch, wool and modified bentonite can be used to adsorb heavy metal cations. With the increasing complexity of water quality and the progress of science and technology, adsorbents for water treatment not only require high efficiency, but also low cost. As the most abundant renewable polymer resources in the world, cellulose is very cheap and can become an ideal adsorbent matrix material.

(1) The source of cellulose

Cellulose is the most important skeletal component in plants, mainly from cotton, wood, flax, straw and so on. Cellulose is the most abundant renewable resource in the world. According to incomplete statistics, more than 100 billion tons of cellulose is produced by photosynthesis worldwide every year. For thousands of years, cellulose has only been used to make energy, building materials and clothing. As a chemical raw material, it has only been studied for 150 years. The molecular chain structure of cellulose is as follows. It is a linear polymer consisting of β-D-glucose group repeatedly linked by 1-4 glycoside bonds, which has the characteristics of hydrophilicity, chirality and biodegradability. Each glucose ring of cellulose contains three active hydroxyl groups, which can take place a series of chemical reactions related to hydroxyl groups, so it is widely modified chemically. The common modification methods of cellulose are: oxidation reaction, esterification reaction, etherification reaction, halogenation reaction, radical graft copolymerization reaction.

(2) Application of modified cellulose in water treatment

According to the kinds of pollutants in water, different methods can be selected to modify different groups on cellulose for the adsorption of pollutants in water.

A, adsorption of heavy metal cation B, adsorption of harmful anion C, adsorption of organic matter

3. Chemical method

The use of chemical reactions to reduce the harmfulness of pollutants by changing their properties or to facilitate their separation and removal. Including to all kinds of wastewater add all kinds of flocculant, so that the chemical reaction with the pollutants in the water, the generation of insoluble in water or insoluble in water compounds, precipitate precipitation, so that the waste water to purify the chemical precipitation method; Neutralization of acidic or alkaline wastewater by neutralization; Chemical oxidation method using liquid chlorine, ozone and other strong oxidants to oxidize and decompose pollutants in wastewater; Using the principle of electrolysis, in the Yin and Yang polarity of oxidation and reduction reaction respectively, so that the water to achieve purification of electrolysis method.

(1) oxidation method (2) electrolysis method (3) supercritical technology

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Added Sep 14 '22



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