A kind of pretreatment method of tannery wastewater

A technology for tanning wastewater and pretreatment, which is applied in animal processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , increase the processing load and maintenance difficulty of the subsequent adjustment tank and coagulation sedimentation tank, cannot effectively reduce the dosage of chemicals and the amount of sludge generated, etc., so as to facilitate comprehensive utilization and final disposal, facilitate stable operation, and reduce dosing costs. Effect

Active Publication Date: 2016-10-05
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 coagulation sedimentation tanks and other facilities, and cannot effectively reduce chemicals. Dosing amount and sludge production; related parameters and treatment effects of classified pretreatment and sludge disposal have not been disclosed

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  • A kind of pretreatment method of tannery wastewater
  • A kind of pretreatment method of tannery wastewater
  • A kind of pretreatment method of tannery wastewater

Examples

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Embodiment 1

[0033] see figure 1 The process flow of the pretreatment method of the tannery wastewater of the present invention is shown, and the present embodiment comprises the following steps:

[0034] (1) After the sulfur-containing wastewater collected in the tanning production process is screened by the sulfur-containing wastewater grid 1 to remove large particles of debris, it flows to the sulfur-containing wastewater conditioning tank 2, and then is lifted to the sedimentation tank 3 for concentration and precipitation, and the precipitation is carried out for 6 hours. After (at least 6 hours) the supernatant is discharged into the comprehensive wastewater treatment system; after the concentrated sludge is adjusted to pH 10 by adding sulfuric acid (the maximum pH value is 10), the plate and frame filter press 4 is used for dehydration, The dehydration period is 4 hours, and the dehydrated clear liquid is discharged into the integrated wastewater treatment system, and the sludge is ...

Embodiment 2

[0041] see figure 1 The process flow of the pretreatment method of the tannery wastewater of the present invention is shown, and the present embodiment comprises the following steps:

[0042] (1) After the sulphur-containing wastewater collected in the tanning production process is screened by the grid 1 to remove large particles of debris, it flows to the sulphur-containing wastewater conditioning tank 2, and then is lifted to the sedimentation tank 3 for concentration and precipitation, and the supernatant is precipitated after 8 hours The liquid is discharged into the comprehensive wastewater treatment system; after the concentrated sludge is adjusted to pH 9 by adding sulfuric acid, it is dewatered by a plate and frame filter press 4, and the dewatering cycle is 3h, and the dewatered clear liquid is discharged into the comprehensive wastewater treatment system. Further disposal of sludge after outbound transportation;

[0043] (2) After the chrome-containing waste water c...

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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 of tannery wastewater, belonging to the technical field of sewage treatment. Background technique [0002] Tanning wastewater is the wastewater discharged from the tanning production process. In the traditional tanning production process, if raw salt (wet or dry) cowhide is used to make light leather, the mass of 20%-40% (about 30% on average) will be converted into tannery. For leather, if heavy leather is made, about 65% of the mass will be converted into leather; with raw salt sheepskin and goat leather, 10%-20% (about 15% on average) of the mass will be converted into leather. In the conventional production process, the quality of raw hides is mostly lost in various wastes. The composition is basically that 1t 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 various chemical materials were added. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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