Tannery wastewater pretreatment method

A tannery wastewater and pretreatment technology, which is applied in animal processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Undisclosed classification of pretreatment sludge disposal related parameters and treatment effects, increasing the treatment load and maintenance difficulty of subsequent adjustment tanks and coagulation sedimentation tanks, etc., to achieve the goal of facilitating comprehensive utilization and final disposal, facilitating stable operation, and reducing dosing costs Effect

Active Publication Date: 2015-07-29
山东省环科院环境工程有限公司
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Problems solved by technology

However, classified pretreatment mainly controls sulfide and total chromium in wastewater, and does not pretreat other wastewater, which increases the treatment load and maintenance difficulty of subsequent adjustment tanks and coagulat

Method used

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  • Tannery wastewater pretreatment method

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Embodiment 1

[0033] see figure 1 Shown the flow process of the pretreatment method of tannery wastewater of the present invention, this embodiment comprises the following steps:

[0034] (1) The sulfur-containing wastewater collected in the tanning production process passes through the sulfur-containing wastewater grid 1 to filter out large particles of impurities, then flows to the sulfur-containing wastewater adjustment tank 2, and then is lifted to the sedimentation tank 3 for concentrated precipitation, and the sedimentation lasts for 6 hours Finally (at least 6 hours) the supernatant is discharged into the integrated wastewater treatment system; after the concentrated sludge is adjusted to a pH value of 10 by adding sulfuric acid (the pH value is at most 10), the plate and frame filter press 4 is used for dehydration. The dehydration cycle is 4 hours, and the dehydrated clear liquid is discharged into the comprehensive wastewater treatment system, and the sludge is transported outside...

Embodiment 2

[0041] see figure 1 Shown the flow process of the pretreatment method of tannery wastewater of the present invention, this embodiment comprises the following steps:

[0042] (1) The sulfur-containing wastewater collected in the tanning production process passes through the grid 1 to screen out large particles of impurities, then flows to the sulfur-containing wastewater regulating tank 2, and then is lifted to the sedimentation tank 3 for concentrated precipitation, and the supernatant after precipitation for 8 hours The liquid is discharged into the comprehensive wastewater treatment system; after the concentrated sludge is adjusted to a pH value of 9 by adding sulfuric acid, it is dehydrated with a plate and frame filter press 4, and the dehydration cycle is 3 hours. The dehydrated clear liquid is discharged into the comprehensive wastewater treatment system. Further disposal of sludge after transport;

[0043] (2) After the chromium-containing wastewater collected in the t...

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Abstract

A tannery wastewater pretreatment method comprises the following steps: (1), precipitating sulfur-containing wastewater, discharging supernatant after precipitation and dewatering sludge after precipitation; (2), carrying out chromium removal treatment on chromium-containing wastewater through an alkali precipitation method and discharging supernatant after precipitation; (3), carrying out precipitation treatment on other wastewater, discharging supernatant after precipitation and mixing sludge with comprehensive wastewater sludge generated in the step (4); (4), enabling effluents discharged in the step (1), (2) and (3) to enter an adjusting tank to be mixed into comprehensive wastewater, lifting the mixed wastewater to a coagulating precipitation tank after adjusting, and carrying out biochemical treatment on supernatant after precipitation. According to the invention, the SS pollution load in the pre-treated comprehensive wastewater is reduced by 95% or above, the COD pollution load in the pre-treated comprehensive wastewater is reduced by 70% or above, the total nitrogen load in the pre-treated comprehensive wastewater is reduced by 30% or above, the content of toxic and harmful substances such as sulfide and total chromium is effectively controlled, and the requirement for stable operation of subsequent biological treatment is met. The treatment effect is stable and the stable operation of a biological system is facilitated.

Description

technical field [0001] The invention relates to a pretreatment method for tannery wastewater, belonging to the technical field of sewage treatment. Background technique [0002] Tannery wastewater is the wastewater discharged during the tannery production process. In the traditional tannery production process, if raw salt (wet or dry) cowhide is used to make light leather, 20%-40% (about 30% on average) of the quality is transformed into For leather, if the heavy leather is made, about 65% of the quality will be converted into leather; if raw salt sheepskin and goatskin are used for leather production, then 10%-20% (about 15% on average) will be converted into leather. In the conventional production process, most of the quality of hides and hides is lost in various wastes, and its composition is basically that 1 ton of raw hides produces about 600kg of solid waste, and the drainage contains about 150-250kg of CODcr and 70-110kg of BOD 5 . In addition, about 500kg of variou...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/24
Inventor 于军苏强高磊陈华东苟晓东刘强
Owner 山东省环科院环境工程有限公司
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