Unlock instant, AI-driven research and patent intelligence for your innovation.

Treatment method for wheat straw pulping black liquor

A technology for pulping black liquor and treatment methods, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of large wastewater volume, difficult treatment, high operating costs, etc., and reduce wastewater Concentration, improvement of treatment efficiency, and reduction of treatment cost

Active Publication Date: 2014-04-09
QINGDAO UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The waste water produced in the paper industry has a large amount of water and is difficult to treat, especially the black liquor produced in the pulping process. The waste water has high COD concentration, large alkali content, high chroma, and poor biodegradability, so it is quite difficult to treat.
At present, there are many treatment methods for pulping black liquor, such as relatively mature alkali recovery treatment technology, multi-effect evaporation technology, wastewater anaerobic digestion and recovery of biogas technology, etc., but these technologies have a large one-time investment and high operating costs. It is difficult for most small and medium paper-making enterprises to bear
However, common biochemical methods, flocculation-sedimentation methods, air flotation methods, membrane technology, etc. are difficult to achieve the treatment effect for pulping black liquor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment method for wheat straw pulping black liquor
  • Treatment method for wheat straw pulping black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 A kind of treatment method of wheat straw pulping black liquor, take the pulping black liquor treatment of annual output 10,000 tons of enzymatic wheat straw pulping as an example, the waste water volume is 240 tons / day, and the technological process is as follows figure 1 As shown, the specific steps are as follows:

[0020] (1) Wastewater collection: the pulping wastewater flows through the pipeline with a volume of 50m 3 A waste water pool, the volume of which meets the discharge volume of 5 hours of production waste water. The quality of wastewater is as follows: CODCr is 48800mg / L, pH is 13.35, and chromaticity is 2500 times;

[0021] (2) Adding acid and acid analysis: add 0.4L of industrial waste acid containing 30% sulfuric acid mass fraction in the collected 50L waste water, mechanically stir and mix, and adjust the pH to 2.5;

[0022] (3) Heating, coagulation and pressure filtration: Prepare a polyaluminum chloride solution with a concentration o...

Embodiment 2

[0026] Embodiment 2 A kind of treatment method of wheat straw pulping black liquor, take the pulping black liquor treatment of chemical wheat straw pulping with an annual output of 100,000 tons as an example, the waste water volume is 2400 tons / day, and the technological process is as follows figure 1 As shown, the specific steps are as follows:

[0027] (1) Wastewater collection: pulping wastewater flows through pipelines with a volume of 500m 3 A waste water pool, the volume of which meets the discharge volume of 5 hours of production waste water. The quality of wastewater is as follows: CODCr is 50800mg / L, pH is 13.85 and chroma is 2500 times;

[0028] (2) add acid and acid analysis: add 500L of collected waste water to 5L of industrial waste acid containing 30% sulfuric acid mass fraction, mechanically stir and mix, and adjust the pH to 3.2;

[0029] (3) Heating, coagulation and pressure filtration: Prepare a polyaluminum chloride solution with a concentration of 2% and ...

Embodiment 3

[0033] Embodiment 3 A kind of treatment method of wheat straw pulping black liquor, take the pulping black liquor treatment of annual production of 100,000 tons of chemical wheat straw pulping as an example, the amount of waste water is 2400 tons / day, and the technological process is as follows figure 1 As shown, the specific steps are as follows:

[0034] (1) Wastewater collection: pulping wastewater flows through pipelines with a volume of 500m 3A waste water pool, the volume of which meets the discharge volume of 5 hours of production waste water. The quality of wastewater is as follows: CODCr is 50600mg / L, pH is 13.6, and chromaticity is 2500 times;

[0035] (2) Adding acid and acid analysis: add 6L of industrial waste acid containing 30% sulfuric acid mass fraction to the collected 500L waste water, mechanically stir and mix, and adjust the pH to 3.2;

[0036] (3) Heating, coagulation and pressure filtration: Prepare a polyaluminum chloride solution with a concentration...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a treatment method for wheat straw pulping black liquor, and belongs to the technical fields of chemical industry and environmental protection. The treatment method for wheat straw pulping black liquor disclosed by the invention mainly comprises the steps of acid adjustment and acidification, heating system treatment, coagulation and press-filtering, iron-carbon micro-electrolysis physicochemical treatment, SBR (sequencing batch reactor) process EM (effective microorganisms) aerobiotic biochemical treatment and the like. According to the treatment method for wheat straw pulping black liquor, most of the substances of lignin, hemicellulose and the like in wastewater are removed via the physicochemical and biochemical methods, so as to reduce the concentration of wastewater and improve biodegradability; and the wastewater is subjected to further biochemical treatment to achieve the standards of the reused water of enterprises, thus changing the simple physical or biochemical treatment process, increasing the treatment efficiency, reducing the treatment cost of the wastewater, and reducing the discharge of the wastewater.

Description

technical field [0001] The invention relates to a treatment method for wheat straw pulping black liquor, which is particularly suitable for the treatment of high-concentration pulping black liquor and belongs to the technical fields of chemical industry and environmental protection. Background technique [0002] The wastewater produced by the papermaking industry has a large amount of water and is difficult to treat, especially the black liquor produced in the pulping process. The wastewater has high COD concentration, high alkali content, high chroma, and poor biodegradability, making it very difficult to treat. At present, there are many treatment methods for pulping black liquor, such as relatively mature alkali recovery treatment technology, multi-effect evaporation technology, wastewater anaerobic digestion and recovery of biogas technology, etc., but these technologies have a large one-time investment and high operating costs. It is difficult for most small and medium-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/02C02F1/52C02F1/461C02F103/28
Inventor 周贵忠刘建庭王绚
Owner QINGDAO UNIV OF SCI & TECH