A two-stage bioleaching continuous process for efficient removal of heavy metal chromium from tannery sludge

A technology of tannery sludge and biological leaching, which is applied in the direction of water pollutants, biological sludge treatment, animal processing wastewater treatment, etc., and can solve the problems of low sludge treatment efficiency, long leaching cycle, different habitats provided by different microorganisms, etc. question

Active Publication Date: 2021-07-09
SICHUAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the single-stage bioleaching reactor commonly used in various studies cannot provide different habitats for different microorganisms, so the leaching cycle is longer and the sludge treatment efficiency is lower.

Method used

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  • A two-stage bioleaching continuous process for efficient removal of heavy metal chromium from tannery sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example provides a method for continuous and repeated batch bioleaching of tannery sludge in a mechanically stirred single-stage reactor, and the specific operations are as follows:

[0029] 1. The influence of feed ratio FR on single-stage reactor A:

[0030] (1) Processing method:

[0031] Using Community-S as the inoculum, bioleaching experiments under different feed ratios (FR) were carried out in a continuous mechanically stirred single-stage reactor A. The height / diameter ratio of the bioleaching reactor is 1.22; the amount of sulfur powder added is 0.5% (w / v) when the reactor is started, the inoculation amount of the enriched colony is 10% (v / v), and the concentration of tannery sludge is 2 % (w / v), made up to a working volume of 2700 mL with ultrapure water.

[0032] Under the condition of sludge concentration TS of 2%, bioleaching experiments with FR of 0.1 and 0.2 were carried out to study the relationship between FR and sludge treatment rate and leachi...

Embodiment 2

[0043] This embodiment provides a method for continuous and repeated batch bioleaching of tannery sludge in a mechanically stirred secondary reactor, and the specific operations are as follows:

[0044] (1) Processing method:

[0045] Bioleaching experiments under different FR and different TS conditions were carried out in a continuous mechanically stirred secondary reactor C using Community-S as the inoculum. The secondary reactor is composed of two single-stage reactors connected in series, and each single-stage reactor has the same structure as the single-stage reactor A. The first stage of the reactor provides biological pre-acidification function, and the reaction working volume of this stage is 1000mL, named Stage 1. The second stage is the main body of the bioleaching reactor, with a working volume of 2700mL, named Stage 2. The start-up conditions of Stage 1 and Stage 2 of this reactor are consistent with those of a single-stage reactor.

[0046] It works like figu...

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Abstract

The invention discloses a two-stage bioleaching continuous process for efficiently removing heavy metal chromium from tannery sludge. Microbial communities, microbial energy substances, and sludge to be treated are respectively added to the first-stage reactor and the second-stage reactor. Make up to the set working volume with water, and start the first and second reactors at the same time; the first reactor and the second reactor respectively carry out the bioleaching reaction; when the pH of the first reactor and the second reactor If the value is lower than the set value, discharge a certain volume of sludge from the second-stage reactor after leaching and then use the sludge in the first-stage reactor to make up for the reaction; take the sludge from the second-stage reactor after leaching The mud and the untreated sludge containing bioenergy substances are added to the first-stage reactor to continue the reaction; repeating steps 3 and 4 to achieve continuous bioleaching reaction dechrome. The invention is beneficial to provide corresponding reaction environment for different microorganisms, promotes long-term continuous operation of biological leaching reaction, and realizes engineering application of biological leaching process.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a secondary bioleaching continuous process for efficiently removing heavy metal chromium from tanning sludge. Background technique [0002] The sewage treatment of tannery enterprises will produce up to hundreds of thousands of tons of sludge every year. Due to the use of a large amount of chromium sulfate and the low utilization rate of chromium in raw hide tanning, the tannery industry has become a potential polluting industry. Studies have shown that only about 60% of the chromium salts have been effectively utilized in the traditional process, and the rest of the chromium has finally entered the tanning sludge (the chromium content can be as high as 1% to 4%). Its safe disposal is the sustainable development of the leather industry. One of the keys. Biological leaching technology uses carbon dioxide as the main carbon source and sulfur powder as the main ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F101/22C02F103/24
CPCC02F11/02C02F2101/22C02F2103/24
Inventor 汤岳琴曾静苟敏孙照勇夏子渊
Owner SICHUAN UNIV
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