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Treatment method for bamboo pulp wastewater

A treatment method and technology for wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of foam dosage

Active Publication Date: 2015-12-16
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, scholars at home and abroad have begun to study wastewater biological treatment under high temperature conditions, but there are few real engineering applications

Method used

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  • Treatment method for bamboo pulp wastewater
  • Treatment method for bamboo pulp wastewater
  • Treatment method for bamboo pulp wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0028] as attached figure 1 , is a typical bamboo pulp wastewater treatment process, and the wastewater is discharged up to standard after neutralization, screening, sedimentation, cooling, aeration, secondary sedimentation, coagulation, and air flotation. figure 1 The emergency pool in the neutralization pool is used for temporary storage when the water volume of the neutralization pool fluctuates greatly, and acts as a buffer. During the aeration process, microorganisms also need to take in enough nitrogen and phosphorus when taking in the carbon source of organic pollutants. For a long time, a large amount of urea or biologically active nitrogen has been added as a nitrogen source in the biological treatment process of wastewater from all papermaking enterprises at home and abroad, and a large amount of phosphate or phosphoric acid has been added as a phosphorus source at the same time (biologically active nitrogen is used in pulp and paper industry wastewater treatment. A...

Embodiment 2

[0038] In the 7 years since the establishment of the wastewater treatment station in 2008, during the normal production of the enterprise, the wastewater treatment station has processed 20,000 tons of mid-stage water every day, and added 440kg of urea and 125kg of trisodium phosphate to the aerobic pool every day. The new technology obtained in the laboratory is now applied to the production of the enterprise. In order to gradually adapt the aerobic bacteria in the aeration tank to the waste water environment with reduced nitrogen and phosphorus, a method of decreasing the dosage of urea and trisodium phosphate every month is adopted. The program of decreasing nitrogen and phosphorus dosage in the aeration tank (see Table 2). From April 1, 2015, the daily input of urea into the aeration tank was reduced from 440 kg to 300 kg, and the daily input of phosphoric acid into the aeration tank The amount of trisodium 125 kg remains unchanged. At the end of April, the one-month engine...

Embodiment 3

[0058] Another bamboo pulp factory in Southwest China produces 8,000 tons of mid-stage wastewater every day. This new method of bamboo pulp wastewater treatment is adopted, and the dosage of urea and diammonium phosphate is gradually reduced within 3 months, and added to the primary sedimentation tank every day. Sodium molybdate and strontium chloride are each 0.4 kg, and cooling tower fan inverters are added to reduce the fan frequency month by month. By the fourth month, the wastewater treatment project is operating normally, and the main indicator of discharged wastewater is COD 75-90mg / L, in line with GB3544 -2008 National Emission Standards. In addition, the total nitrogen in the discharged wastewater is reduced by 21%, and the total phosphorus is reduced by 37%. The waste water treatment cost in the fourth month is 27,000 yuan lower than before the implementation of the new method, and the annual comprehensive cost can be saved by 300,000 yuan.

[0059] As can be seen fr...

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Abstract

The invention discloses a treatment method for bamboo pulp wastewater. The method is improved on the basis of a conventional treatment method for bamboo pulp wastewater, large suspended matters are screened out, filtered and removed from wastewater, trace elements are added before treatment in a primary settling tank, the temperature of the wastewater cooled before entering an aeration tank is increased, and meanwhile, nutritive salt added to the aeration tank is gradually reduced. The nutritive salt containing two trace elements molybdenum and strontium is added, foam generated as a result of addition of a large amount of nitrogen and phosphorus is remarkably reduced, accordingly, expenses required for addition of nitrogen and phosphorus nutritive salt, an antifoaming agent and the like are saved while the biological activity of the aeration tank is guaranteed, and the content of total nitrogen and total phosphorus in discharged wastewater is substantially reduced. Besides, according to the method, the temperature of the wastewater is properly increased, the microorganism activity is still maintained, and the energy consumption required for reduction of the temperature of the wastewater is reduced. The cost for removing 1kg of COD (chemical oxygen demand) is reduced from 1.04 RMB to 0.67 RMB, the total nitrogen in the discharged wastewater is reduced by 28%, the total phosphorus in the discharged wastewater is reduced by 45%, and the treatment method has remarkable environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to a treatment method of industrial waste water, in particular to a treatment method of bamboo pulp waste water. Background technique [0002] my country is the country with the richest bamboo resources in the world, with more than 500 varieties of bamboo, and its planting area and stock volume rank first in the world. During the "Twelfth Five-Year Plan" period, my country's bamboo pulp production capacity increased from 1.94 million tons to 2.4 million tons, and bamboo consumption increased from 7.76 million tons to 9.6 million tons. my country's paper industry is in short supply of raw materials. Bamboo is an important supplement of fiber raw materials for my country's paper industry. Substituting bamboo for wood, integrating bamboo pulp and paper, and making paper with bamboo can save a lot of wood and protect forests. The pulp integration project using bamboo as raw material can make full use of the regeneration ability of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 房桂干施英乔邓拥军沈葵忠丁来保盘爱享林艳韩善明焦健李红斌梁芳敏张华兰梁龙田庆文
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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