How to reduce the pollution of papermaking, is the pollution of papermaking serious?

This problem is relatively big, the traditional papermaking method is more polluting, the pollution is mainly water pollution, you can choose the best papermaking additives to reduce the concentration of white water, you can also take DMC clean pulping technology, no sewage discharge, water saving 98%, in addition to the more traditional pollution control methods, which index exceeds the standard plus the corresponding thing to reduce, waste not to say, pollution is greater!

The wastewater discharge of construction projects has the following links: that is, the wastewater discharged from the pulp preparation workshop, the wastewater discharged from the cardboard workshop, the clean and sanitary sewage discharged from the workshop, and the wet dust removal device. Due to the complex channels of waste paper**, the quality of wastewater often changes.

It is precisely because of the above characteristics of papermaking wastewater that its treatment methods are also diverse. The practice at home and abroad has proved that physicochemical treatment and biochemical treatment are the main technologies in the treatment process of recycled papermaking wastewater.

In the process of using waste paper to produce recycled paper, part of the wastewater is generated, the construction unit in the project plan proposed to be treated separately according to the situation, for the wastewater containing a higher concentration of paper fiber, the construction unit will try to recycle, and the paper fiber, recycled paper production can generally be recycled 30%, which can not only reduce the discharge of pollutants, but also increase the economic benefits of the enterprise; For wastewater that cannot be recycled, the construction unit will also carry out purification treatment and discharge it only after it meets the corresponding discharge standards.

The paper industry is a light industry with large output, large water use and serious pollution. If the wastewater of the paper industry is discharged into the river without treatment, the organic matter in the wastewater will be fermented, oxidized and decomposed, and the oxygen in the water will be consumed, so that fish, shellfish and other aquatic organisms will die of hypoxia, and some fine fibers will be suspended in the water, which is easy to block the gills of the fish and cause fish death. The bark chips, wood chips, grass clippings, rotting weeds, and putrid slurry in the wastewater sink to the bottom of the water, silting up the riverbed, and constantly producing toxic odors in the slow fermentation; There are also some substances in the wastewater that are not easy to ferment and decompose, which are suspended in the water, absorb light, reduce sunlight penetrating into the river water, and hinder the photosynthesis of aquatic plants.

Paper Mill Waste Gas Treatment Program:

1. The odor generated in the pulping production process: it will be sent to the alkali boiler for combustion through a completely sealed conveying system.

2. Waste gas generated by pulp bleaching and preparation of chemical reagents: After chemical treatment in the exhaust gas scrubber, it is transformed into a gas that does not pollute the air, and then discharged into the atmosphere.

3. Dust generated by the combustion of power boilers, alkali boilers and lime kilns: Efficient electrostatic precipitators are set up before combustion exhaust gas discharge to remove the dust in the limb rot front. <>

The paper industry is a light industry with large output, large water use and serious pollution.

If the wastewater of the paper industry is discharged into the river without treatment, the organic matter in the wastewater will be fermented, oxidized and decomposed, which will consume oxygen in the water and cause death of aquatic organisms such as fish and shellfish due to lack of oxygen; Some fine fibers are suspended in the water, which is easy to clog the gills of fish and also cause fish death;

The bark chips, wood chips, grass clippings, rotting weeds, and putrid slurry in the wastewater sink to the bottom of the water, silting up the riverbed, and constantly producing toxic odors in the slow fermentation; There are also some substances in the wastewater that are not easy to ferment and decompose, which are suspended in the water, absorb light, reduce sunlight penetrating into the river water, and hinder the photosynthesis of aquatic plants.

Pollution and prevention of paper industry.

The wastewater, waste gas, waste residue, toxic substances and noise produced in the production of the paper industry can cause serious pollution to the environment, and it has become an important part of the paper industry to control, prevent or eliminate them, so that the surrounding environment is not affected or less. The paper industry is the most serious water pollution, with large water use and drainage (generally more than 300 tons of water per ton of pulp and paper), high organic matter content in wastewater, high biochemical oxygen demand (BOD), suspended solids (SS), and toxic substances, color and odor, endangering the normal growth of aquatic organisms, affecting the water and environmental landscape of industry, agriculture and animal husbandry and residents. Over the years, suspended solids can silt up riverbed ports and produce toxic odors of hydrogen sulfide, which can be harmful in a far-reaching way.

Pollution source: The main process of the paper industry is material preparation, pulping, alkali **, bleaching, papermaking, etc. Dust, bark, wood chips, and grass dust are generated during the preparation of raw materials; Pulping and alkali **, bleaching process produces waste gas, dust, wastewater, lime slag, etc.; The white water produced during the papermaking process contains contaminants.

The pollution of the paper industry to the environment can be divided into three categories: water pollution, air pollution and solid waste pollution.

Solid waste: there are putrid slurry, slurry, tree bark, wood chips, grass, grass roots, grass powder, silica white mud, lime slag, pyrite slag, coal ash slag, etc., which encroach on the site and pollute the water body and underground water source by leaching out the turbid water. Noise pollution is also a major problem in the paper industry.

Pollution prevention and control can be divided into two categories: on-site harmless treatment and off-site wastewater treatment.

Let's talk about it separately here:

1. Hazards of papermaking:

Papermaking uses wood, excessive deforestation causes serious consequences such as land desertification, and papermaking also produces serious water pollution and soil pollution, which comes from the papermaking process

1) Cooking waste.

Function: Separation of fiber and lignin....

Characteristics: 1 3 about inorganic matter, for a variety of sodium salt, of which the sio2 content in the black liquor of straw pulp is very high, 2 3 about organic matter, the main components are alkali lignin, fatty acids and resin acid. It contains a large amount of caustic soda.

Its BOD is about 9000 30000mg L, accounting for 90% of the BOD load in the whole field. It is called "black liquor" because of its black color.

2) Washing wastewater.

Function: Remove the cooking liquid remaining in the slurry after extraction.

Features: The washing section requires a large amount of water, and the wastewater is brown, containing black liquor components and suspended fibrous substances. The amount and concentration of wastewater depends on the washing equipment.

3) Screening of wastewater.

Function: Remove relatively large non-fibrous solid impurities in the slurry, and wash out the residual black liquor in the slurry at the same time.

Characteristics: Non-fibrous solids and residual black liquor.

4) Bleaching wastewater.

Function: Bleaching pulp such as hypochlorite, chlorine dioxide, hydrogen peroxide, etc., and dissolving lignin remaining in fibers.

Features: Recyclable or used for pulp washing. The main component of the wastewater in this section is organochloride, which is mostly highly toxic.

5) Paper machine wastewater.

Function: Paper machine papermaking.

Features: The wastewater in this section is also known as white water, and the pollutants are mainly fibers, fillers, raw materials, auxiliary chemicals and chemical additives, and its pollutant content is not high, the BOD is low, and it can be reused after proper treatment.

2. Paper pollution:

If the waste paper is disposed of by landfill, it is also difficult to degrade, which will cause pollution of the land, and the harmful substances in the paper will invade the land, causing a large number of crops and plants to die.

The growth history of the paper industry and its impact on the environment and ecology.

The main thing is wastewater pollution. It's still quite serious.