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Papermaking wastewater pretreatment process adopting chemical dosing type CSTR and coagulation air floatation

A technology of papermaking wastewater and coagulation air flotation, which is applied in the direction of processing wastewater treatment, flotation water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Coagulation and sedimentation process effect, incomplete separation of pollutants and other problems, to achieve the effect of reducing inhibition and poisoning, improving effect, and reducing viscosity

Inactive Publication Date: 2020-07-24
邓燕军 +1
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Problems solved by technology

[0007] (1) When "coagulation air flotation" and "coagulation sedimentation" are used to treat wastewater with high organic matter content, some organic matter in the wastewater is highly hydrophilic, and adding chemicals directly to the wastewater often has a large dosage and separation of pollutants incomplete features
[0008] (2) Pulp dyes are highly water-soluble and generally contain sulfide components. It is difficult to completely remove dyes in wastewater by directly using "coagulation air flotation" and "coagulation precipitation" processes for pretreatment
However, when the wastewater contains sulfide components, the anaerobic reaction is inhibited, and the effect of the anaerobic hydrolysis pre-acidification process is not ideal, which in turn affects the effect of the subsequent coagulation and sedimentation process

Method used

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  • Papermaking wastewater pretreatment process adopting chemical dosing type CSTR and coagulation air floatation
  • Papermaking wastewater pretreatment process adopting chemical dosing type CSTR and coagulation air floatation
  • Papermaking wastewater pretreatment process adopting chemical dosing type CSTR and coagulation air floatation

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Embodiment 1

[0034] In order to more accurately explore the characteristics of the combined process of "dosing CSTR + coagulation air flotation", the present invention simulates the operating conditions of the actual project, taking "dosing CSTR + coagulation air flotation" as experiment 1, and at the same time made a control experiment around experiment 1 2 to 5, the main steps of the experiment are as follows:

[0035] Step 1: In the experimental CSTR small test equipment (effective volume 1m 3 ) into the mud-water mixture discharged from a firecracker paper papermaking wastewater CSTR.

[0036] Step 2: In the CSTR small test equipment of experiment 1, experiment 2, experiment 3 and experiment 4, use 0.5m 3 Inject a certain firecracker paper papermaking wastewater at a speed of / h, and at the same time, Fecl was added to the wastewater at a concentration of 250mg / L in Experiment 1 and Experiment 2 2 solution.

[0037] Step 3: The CSTR effluent from Experiment 1 and Experiment 3 flowed...

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Abstract

The invention relates to a papermaking wastewater pretreatment process adopting a chemical dosing type CSTR and coagulation air floatation. A physical method, a chemical method and a biological methodare combined, and a chemical agent FeCl2 is added into a biological CSTR so as to form a novel chemical dosing type CSTR + coagulation air floatation combined process. FeCl2 is added into the CSTR, so that the ORP value of the wastewater can be reduced by utilizing the reducibility of Fe<2+> ions. Meanwhile, Fe<2+> ions can also react with some toxic and harmful substances such as hydrogen sulfide (H2S) generated by anaerobic reaction in the papermaking wastewater to generate FeS precipitates, so as to reduce the inhibition and toxic effects of the S<2-> on anaerobic bacteria, create a good environment for the anaerobic reaction, enhance the degradation of cellulose, hemicellulose, lignin, polysaccharide and other organic matters in the wastewater by the anaerobic biological reaction, effectively reduce the viscosity of the wastewater, reduce the chemical dosing amount of the subsequent coagulation air floatation process, save treatment cost, and improve the wastewater pretreatment effect.

Description

[0001] Field [0002] The invention relates to a pretreatment process of papermaking wastewater, in particular to a method for pretreatment of papermaking wastewater by a novel combined process of "dosing type CSTR + coagulation air flotation". [0003] Background of the invention [0004] The wastewater produced by the paper industry has the characteristics of various pollutants, large water volume, complex composition, high content of suspended solids, and high concentration of organic pollutants. It is one of the most difficult industrial wastewater to treat. The papermaking wastewater treatment process is generally divided into three parts: pretreatment, biological treatment and advanced treatment. The pretreatment in the wastewater treatment of the papermaking industry can be divided into in-plant pretreatment and out-of-plant pretreatment. In-plant pretreatment mainly adopts screening and filtration, air flotation, etc. to recycle pulp fibers; out-of-plant pretreatment me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/28
CPCC02F1/24C02F1/5236C02F1/56C02F3/28C02F9/00C02F2103/28
Inventor 邓燕军伦见强
Owner 邓燕军
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