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Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge

A technology for biochemical sludge and sludge dewatering, which is applied in the direction of dewatering/drying/concentrating sludge treatment, and can solve the problems of difficult sludge deep dewatering, nitrogen and phosphorus release, etc.

Active Publication Date: 2014-05-07
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional concentration / mechanical dehydration process can only remove most of the pore water and part of the capillary water in a free state, and it is difficult to achieve deep dehydration of the sludge, and it is also difficult to release the nitrogen and phosphorus in the microorganisms of the biochemical sludge, and the its use

Method used

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  • Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge
  • Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge
  • Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge

Examples

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Effect test

Embodiment 1

[0018] The sludge is taken from a large comprehensive pulp and paper factory in Shandong with an area of ​​80,000 m 3 / d Secondary sedimentation tank of wastewater treatment project, from which nitrogen and phosphorus are extracted and reused and deep dehydration is realized through the following steps:

[0019] (1) Pretreatment of papermaking wastewater biochemical sludge

[0020] Take 150ml of papermaking wastewater to treat biochemical sludge, put the power of the ultrasonic transducer head at 400w, and the ultrasonic frequency at 20kHz, and insert it into the sludge for 10s to treat the biochemical sludge under the mechanical effect and cavitation effect of ultrasonic waves. Breakdown of microorganisms in mud. The intracellular substances and water are released, and part of the intracellular water is converted into adsorbed water.

[0021] (2) Flocculation treatment

[0022] The sludge mixture obtained through step (1), under the condition that the stirring speed is 300...

Embodiment 2

[0026] The sludge is taken from a small paper mill in Hebei that uses waste cardboard as raw material to produce packaging paper with an area of ​​30,000 m 3 / d Secondary sedimentation tank of wastewater treatment project, from which nitrogen and phosphorus are extracted and reused and deep dehydration is realized through the following steps:

[0027] (1) Pretreatment of papermaking wastewater biochemical sludge

[0028] Take 150ml of papermaking wastewater to treat biochemical sludge, put the power of the ultrasonic transducer head at 500w, and the ultrasonic frequency at 25kHz, and insert it into the sludge for 12s to treat the biochemical sludge under the mechanical effect and cavitation effect of ultrasonic waves. Breakdown of microorganisms in mud. The intracellular substances and water are released, and part of the intracellular water is converted into adsorbed water.

[0029] (2) Flocculation treatment

[0030] The sludge mixture obtained through step (1), under the ...

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Abstract

The invention relates to a method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating the sludge, belonging to the field of pulping and papermaking environment friendliness. The method is adopted for overcoming the current situations that papermaking wastewater is rich in carbon source and lack of nitrogen and phosphorus, microorganisms in biochemical sludge are rich in nitrogen and phosphorus, part of the biochemical sludge is finally used as residual sludge to be discharged out of a water treatment system, and the dehydration is difficult. The method comprises the steps of ultrasonic crushing, flocculation and mechanical filter pressing is adopted. Firstly, microorganisms are crushed under the ultrasonic action so that substances in the microorganism are released, then, solid-liquid separation is realized under the actions of flocculation and machines, the liquid is recycled to a papermaking wastewater treatment process, the weight of the recycled N and P in treating every ton of biochemical sludge can be respectively up to over 0.45kg and over 0.1kg, and the nitrogen and phosphorus which are added for biochemically treating the papermaking wastewater can be effectively reduced; and meanwhile, the dryness of the sludge can be up to over 50%, the heat value of the sludge can be up to over 6MJ / kg, and the sludge can be directly burned in a biomass boiler. By using the method, the biochemical papermaking sludge can be comprehensively utilized.

Description

technical field [0001] The invention relates to a method for extracting nitrogen and phosphorus from recycled papermaking biochemical sludge and realizing sludge dehydration, and belongs to the technical field of pulping and papermaking environmental protection. Background technique [0002] In addition to a large amount of waste water, there is also a large amount of solid waste generated during the papermaking process. The former has received extensive attention from relevant state departments and society, and many effective control measures have been taken, especially during the "Eleventh Five-Year Plan" During the period, with the implementation of relevant policies and standards, as well as the update of enterprise technical equipment, more than 96% of the wastewater has been discharged up to the standard, and the reduction of wastewater pollutants has achieved remarkable results. After physical, biological and chemical treatment, the wastewater is finally separated fro...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F11/14
Inventor 苏振华冯文英张羽王承亮徐明张升友曹瀛戈
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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