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Papermaking wastewater calcium-control process for anaerobic tower

A paper-making wastewater and anaerobic tower technology, which is applied in anaerobic digestion treatment, processing wastewater treatment, water aeration, etc., can solve the problems of affecting the anaerobic tower processing capacity, anaerobic sludge death, and increasing costs, etc., to achieve Improve ability, increase vitality, reduce the effect of content

Active Publication Date: 2018-11-02
ZHEJIANG RONGSHENG PAPER IND HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, a large amount of CaCO 3 The existence of the anaerobic bacteria will be coated, resulting in the premature death of the anaerobic sludge, which will not only waste resources and increase costs, but also affect the treatment capacity of the anaerobic tower

Method used

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  • Papermaking wastewater calcium-control process for anaerobic tower
  • Papermaking wastewater calcium-control process for anaerobic tower
  • Papermaking wastewater calcium-control process for anaerobic tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: a kind of papermaking wastewater calcium control technology for anaerobic tower, such as figure 1 and figure 2 shown, including the following steps:

[0043] Step S1, pre-acidification: the papermaking wastewater treated by the hydrolysis biochemical tank flows into the conduit 1 from the water outlet, and then dilute sulfuric acid flows into the conduit 1 through the dosing pipe 1 to adjust the pH of the papermaking wastewater to 6-7.

[0044] Step S2, continue to add the anaerobic calcification dispersant from the dosing pipe 2 and 3 in the pre-acidified papermaking wastewater, and control the temperature of the papermaking wastewater at 35-40°C. Among them, the anaerobic calcification dispersant is a compound of EDTMPA and EDTA. EDTMPA is a high-purity reagent and non-toxic. EDTMPA is a white crystalline powder at room temperature, with a melting point of 215-217 ° C, micro Soluble in water, the solubility at room temperature is less than 5%, easily ...

Embodiment 2

[0047] Embodiment 2: A calcium control process for papermaking wastewater used in anaerobic towers. The difference from Embodiment 1 is that in step S2, the anaerobic calcification dispersant includes a compound of EDTMPA, EDTA and HEDP. Among them, EDTMPA or ethylenediaminetetramethylenephosphonic acid is a high-purity reagent and non-toxic. And EDTA is a representative substance of chelating agent, it can be used as calcium chelating agent. In addition, hydroxyethylidene diphosphonic acid HEDP is an organic phosphoric acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. Therefore, the use of any one of the above three anaerobic calcification dispersants can reduce the calcium ion calcification rate in the anaerobic tower, thereby increasing the survival time and number of anaerobic sludge in the anaerobic tower, and improving the anaerobic sludge. The ability of the to...

Embodiment 3

[0048] Embodiment 3: A calcium control process for papermaking wastewater used in anaerobic towers. The difference from Embodiment 1 is that in step S2, the anaerobic calcification dispersant includes a compound of EDTMPA, EDTA and PAAS. Among them, EDTMPA or ethylenediaminetetramethylenephosphonic acid is a high-purity reagent and non-toxic. And EDTA is a representative substance of chelating agent, it can be used as calcium chelating agent. In addition, sodium polyacrylate PAAS can disperse the crystallite or sediment of calcium carbonate, calcium sulfate and other salts in water without precipitation, so as to achieve the purpose of scale inhibition. Therefore, the use of any one of the above three anaerobic calcification dispersants can reduce the calcium ion calcification rate in the anaerobic tower, thereby increasing the survival time and number of anaerobic sludge in the anaerobic tower, and improving the anaerobic sludge. The ability of the tower to treat papermaking...

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Abstract

The invention discloses a papermaking wastewater calcium-control process for an anaerobic tower, and belongs to the technical field of papermaking wastewater treatment. According to the technical scheme, the papermaking wastewater calcium-control process for the anaerobic tower comprises the steps: S1, pre-acidification: enabling papermaking wastewater treated via a hydrolytic biochemical tank toflow into a guide tube from a water outlet, and then enabling dilute sulphuric acid to flow into the guide tube via a first chemical feed pipe so as to regulate PH of the papermaking wastewater into 6-7; step S2, continuing adding an anaerobic calcification dispersing agent in the papermaking wastewater subjected to pre-acidification treatment from a second chemical feed pipe, and controlling thetemperature of the papermaking wastewater to be 35-40 DEG C; step S3, discharging the papermaking wastewater treated in step S2 to the bottom of the anaerobic tower via the guide tube and treating thewastewater; and step S4, discharging the treated papermaking wastewater into an aeration tank from a pipe above the anaerobic tower and carrying out aeration and calcification treatment. The calcification speed of calcium ions in the anaerobic tower is reduced, and the ability of treating the papermaking wastewater of the anaerobic tower is improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking wastewater treatment, and more specifically relates to a calcium control process for papermaking wastewater used in anaerobic towers. Background technique [0002] China is one of the first countries in the world to produce paper, and it is also a big paper country at present. Its paper production ranks first in the world, and its paper waste resources are also very rich. With the continuous growth of paper consumption, the treatment of paper wastewater has also been improved. Pay attention to. [0003] Among them, pulping, pulp washing, bleaching and papermaking processes are carried out in the paper making process. At present, most of the existing papermaking adopts alkaline pulping process, and the resulting papermaking wastewater not only contains a large amount of NaOH, Na 2 S and Na 2 SO 4 , but also contains a large amount of CaCO 3 and a small amount of MgCO 3 . At the same time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F103/28
CPCC02F1/66C02F3/28C02F5/14C02F7/00C02F9/00C02F2103/28
Inventor 谭拥军
Owner ZHEJIANG RONGSHENG PAPER IND HLDG