Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Hypoxia-aerobic comprehensive treatment method for tannery waste water

A technology for comprehensive treatment of tannery wastewater, applied in animal processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Total nitrogen removal effect, undisclosed relevant parameters and treatment effect, etc., to achieve the effect of inhibiting sludge floating, reducing oil content, and preventing sludge loss

Active Publication Date: 2015-06-17
SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process mainly controls ammonia nitrogen and COD in wastewater, and does not fully consider the removal effect of total nitrogen in wastewater, nor does it consider bioaugmentation and emergency measures to deal with the impact of influent load and sludge swelling or floating in biochemical systems, and Relevant parameters and treatment effects of the process are not disclosed

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
  • Hypoxia-aerobic comprehensive treatment method for tannery waste water
  • Hypoxia-aerobic comprehensive treatment method for tannery waste water
  • Hypoxia-aerobic comprehensive treatment method for tannery waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) After the chromium-containing wastewater and sulfur-containing wastewater from the leather production workshop are classified and pretreated, they enter the adjustment tank 1 together with other wastewater, and the residence time is 24 hours. The tank is fully aerated to maintain an aeration rate of 1.8m 3 / m 2 h.

[0044] (2) The adjusted effluent is lifted to the coagulation sedimentation tank 2, and 250mg / l iron salt coagulant is added simultaneously, the reaction time of the coagulation zone of the coagulation sedimentation tank is 15min, and the surface load of the sedimentation zone is 0.7m 3 / (m 2 h), waste water residence time 4 hours. Make the supernatant pH 7-10, S 2- ≤50mg / L, total chromium <1.5mg / L and SS (suspended solids concentration) ≤500mg / L.

[0045] (3) The supernatant after coagulation and sedimentation is introduced into the anoxic / aerobic pool; the wastewater is fully nitrified and denitrified in the pool; the hydraulic retention time of th...

Embodiment 2

[0053] (1) The comprehensive wastewater from the leather production workshop flows to the adjustment tank 1 after being screened out by coarse and fine screens to remove large particles. 3 / m 2 h.

[0054] (2) The adjusted effluent is lifted to the coagulation sedimentation tank 2, and 250mg / l iron salt coagulant is added simultaneously, the reaction time of the coagulation zone of the coagulation sedimentation tank is 15min, and the surface load of the sedimentation zone is 0.7m 3 / (m 2 h), the wastewater residence time is 4h. Make the supernatant pH 7-10, S 2- ≤50mg / L, total chromium <1.5mg / L and SS (suspended solids concentration) ≤500mg / L.

[0055] (3) The supernatant after coagulation and sedimentation is introduced into the selective reaction zone 3 of the anoxic / aerobic tank, fully mixed with the sludge returned from the return sludge well 8 of the secondary settling tank, and then flows to the anoxic zone 4 and well in sequence Oxygen zone 5, the wastewater is ful...

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

PropertyMeasurementUnit
Surface loadaaaaaaaaaa
Login to View More

Abstract

The invention provides a hypoxia-aerobic comprehensive treatment method for tannery waste water. The hypoxia-aerobic comprehensive treatment method for the tannery waste water comprises the following steps: (1), performing classification pretreatment on waste water in a tannery production process, and fully mixing the pretreated water; (2), performing coagulating precipitation treatment on mixed waste water; (3), importing precipitated supernate into a hypoxia-aerobic pool to generate nitrification and denitrification reactions; (4), imputing the waste water treated in the hypoxia-aerobic pool into a secondary precipitation tank to perform a precipitation treatment, directly discharging precipitated supernate or performing an advanced treatment according to standard requests, enabling the precipitated sludge to backflow to the hypoxia-aerobic pool; and (5), conveying the sludge in a coagulating precipitation pool and the residual sludge in the secondary precipitation tank to a sludge concentration pool, dewatering by utilizing a sludge dewatering machine to form filter cakes, and conveying the filter cakes outside. According to the hypoxia-aerobic comprehensive treatment method for the tannery waste water, the quality and the quantity of water entering a subsequent treatment unit can be fully balanced, the treatment load of a biochemical system is effectively reduced, the settling property of the sludge is improved, the nitrification and denitrification efficiencies of the system are quickly improved, the sludge loss is prevented, the treatment effect is stabilized, and the quality of supernate effluent is ensured.

Description

technical field [0001] The invention relates to a treatment method for tannery wastewater, which belongs to the technical field of sewage treatment. Background technique [0002] Leather wastewater is characterized by S 2- 、Cr 3+ , COD, BOD 5 , ammonia nitrogen and total nitrogen concentration are high, and contain a large amount of chloride and sulfate, etc., and the wastewater volume and water quality of each section vary greatly. Even if the liming and dehairing wastewater and chrome tanning wastewater are classified and pretreated separately, the pollutant components of the mixed comprehensive wastewater are still complex and the pollution load is still large. Therefore, for comprehensive wastewater, a combination of physical and chemical treatment and biochemical treatment is usually used, that is, the physical and chemical treatment of the wastewater is carried out first, so that the environment of the wastewater is suitable for the survival of microorganisms, and t...

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
IPC IPC(8): C02F9/14C02F103/24
Inventor 于军苏强刘强高磊陈华东王睿
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com