CN112062400A

CN112062400A - Biological membrane reaction type leather-making waste water treatment method

Info

Publication number: CN112062400A
Application number: CN202010935027.5A
Authority: CN
Inventors: 王志鹏
Original assignee: Jiangsu Zhongzhi Xinyu Environmental Technology Co ltd
Current assignee: Jiangsu Zhongzhi Xinyu Environmental Technology Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2020-12-11

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a biofilm reaction type tanning wastewater treatment method. The method comprises the following steps: a) feeding the tannery wastewater into a grid pool to isolate garbage in water; b) stirring and pre-aerating the wastewater in a regulating tank, and feeding the treated water into a sequencing batch biofilm reactor; c) after microorganisms in the wastewater are removed by the sequencing batch biofilm reactor, water meeting the discharge standard is obtained; d) after being concentrated, the sludge discharged by the sequencing batch biofilm reactor is sent into a supercritical water oxidation system for treatment, organic matters in the sludge are oxidized into carbon dioxide and water, and meanwhile, intermediate conversion substances are also completely decomposed. The invention removes suspended aerobic type, attached facultative aerobic type and attached anaerobic type microorganisms by the process of anaerobic, anoxic and aerobic of the sequencing batch biofilm reactor. The discharged sludge is treated by supercritical water oxidation, and the sludge is used for making bricks, so that the recycling is realized.

Description

Biological membrane reaction type leather-making waste water treatment method

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a biofilm reaction type tanning wastewater treatment method.

Background

Tannery wastewater refers to wastewater produced during the preparation and tanning stages of a tannery process, i.e., during wet operations. The tannery has large wastewater discharge amount, high pH value, high chromaticity, various pollutants and complex components. The main pollutants are heavy metal chromium, soluble protein, scurf, suspended matters, tannin, lignin, inorganic salt, oil, surfactant, dye, resin and the like. The water quality of the leather-making industrial wastewater in China: pH is 7-9, COD is 2000-3000 mg/L, BOD 52000 mg/L, chloride is 2000-3000 mg/L, sulfate is 1000mg/L, trivalent chromium is 70-80 mg/L, and phenol is 5-10 mg/L. The general treatment method of the tannery wastewater comprises the following steps: the method comprises the steps of removing hair, skin meat, skin slices, sediments and the like by adopting screening or natural precipitation, then mixing the materials into domestic sewage, and treating the tannery wastewater by using biochemical methods such as coagulation precipitation, biological filter or activated sludge and the like, wherein the wastewater discharge amount is large, the pH value is high, the chromaticity is high, the pollutant types are various, and the components are complex. The main pollutants comprise heavy metal chromium, soluble protein, scurf, suspended matters, tannin, lignin, inorganic salt, oil, a surfactant, an auxiliary agent, dye, resin and the like. The former process generally adopts A/O biochemical process to treat the waste water, and the process has large floor area and high energy consumption.

Disclosure of Invention

In order to solve the technical problems described in the background technology, the invention provides a biomembrane reaction type leather-making wastewater treatment method, which removes suspended aerobic type, attached facultative type and attached anaerobic type microorganisms by anaerobic, anoxic and aerobic processes through a sequencing batch biomembrane reactor. The discharged sludge is treated by supercritical water oxidation, and the sludge is used for making bricks, so that the recycling is realized.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a biomembrane reaction type leather-making wastewater treatment method comprises the following steps:

a) feeding the tannery wastewater into a grid pond for separating garbage in water, and feeding the wastewater passing through the grid pond into a regulating pond;

b) stirring and pre-aerating the wastewater in a regulating tank, and feeding the treated water into a sequencing batch biofilm reactor;

c) after microorganisms in the wastewater are removed by the sequencing batch biofilm reactor, water meeting the discharge standard is obtained;

d) after being concentrated, the sludge discharged by the sequencing batch biofilm reactor is sent into a supercritical water oxidation system for treatment, organic matters in the sludge are oxidized into carbon dioxide and water, and meanwhile, intermediate conversion substances are also completely decomposed;

e) and (4) preparing the sludge treated by the supercritical water oxidation system into a rotor.

Specifically, in the step d, the sludge discharged by the sequencing batch biofilm reactor is sent into a sludge concentration tank for concentration.

The invention has the beneficial effects that: the invention provides a biomembrane reaction type leather-making wastewater treatment method, which removes suspended aerobic, attached facultative anaerobic and attached anaerobic microorganisms by anaerobic, anoxic and aerobic processes of a sequencing batch biofilm reactor. The discharged sludge is treated by supercritical water oxidation, and the sludge is used for making bricks, so that the recycling is realized.

Drawings

The invention is further described with reference to the following figures and examples.

FIG. 1 is a schematic diagram of the framework of the present invention;

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams illustrating only the basic structure of the invention in a schematic manner, and thus show only the constitution related to the invention.

Fig. 1 is a schematic diagram of the framework of the present invention.

As shown in the attached figure 1, a biomembrane reaction type tannery wastewater treatment method comprises the following steps:

And d, feeding the sludge discharged by the sequencing batch biofilm reactor into a sludge concentration tank for concentration.

A Sequencing Batch Biofilm Reactor (Sequencing Biofilm Batch Reactor), also known as a membrane SBR (BABR), is a new biological sewage treatment process which is researched and applied at home and abroad. The sequencing batch biofilm reactor is a novel composite biofilm reactor developed by filling different fillers (such as fiber fillers, activated carbon, ceramsite and the like) in an SBR reactor, and the intervention of the fillers provides a more favorable living environment for microorganisms. The microorganisms form a complex ecosystem consisting of a plurality of nutrition levels such as bacteria, fungi, algae, protozoa, metazoan and the like in the longitudinal direction, and form a suspended aerobic type, attached facultative type and attached anaerobic type microorganism system with various different activities, breathing types and nutrition types in the transverse direction along the direction of water flowing to the carrier, thereby greatly improving the processing capacity and stability of the reactor, and the advantages of stable reaction process, more and complex biomass, less residual sludge, less power consumption and small occupied area of the sequencing batch biofilm reactor are achieved.

Supercritical Water Oxidation (SCWO) technology is a technology capable of realizing deep Oxidation treatment of various organic wastes. Supercritical water oxidation is to completely oxidize organic matters into clean substances such as H2O, CO2, N2 and the like through oxidation, S, P and the like are converted into salts with the highest valence for stabilization, and heavy metal oxidation stabilization solid phase exists in ash. The principle of the Supercritical Water Oxidation (SCWO) technology is that Supercritical Water is used as a reaction medium, and organic matters are rapidly converted into CO2, H2O, N2 and other harmless small molecules through a homogeneous Oxidation reaction.

The supercritical water oxidation is used for treating the sludge, completely removing pollutants in the sludge, and further preparing reprocessing products such as activated carbon and the like for utilizing resources. Therefore, the zero discharge of the waste water is really achieved, the clear water separated by filtering is repeatedly used for production, water resources can be saved, water cost can be saved, the waste such as sludge and the like can be recycled and reprocessed every year, considerable economic benefits can be obtained, the tannery waste water is treated, high pollution discharge cost can be avoided, the obtained economic benefits can not only offset the operation cost for treating the waste water, but also can obtain additional economic benefits.

In light of the foregoing description of preferred embodiments according to the invention, many modifications and variations can be made by the worker skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A biomembrane reaction type leather-making wastewater treatment method is characterized in that: the method comprises the following steps:

2. The biofilm reaction type tannery wastewater treatment method according to claim 1, characterized in that: and d, feeding the sludge discharged by the sequencing batch biofilm reactor into a sludge concentration tank for concentration.