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Railway wash water recovery and utilization method

A sewage and railway technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sewage multi-stage treatment, etc. Realize the effect of automatic control, less equipment occupation, convenient operation and management

Inactive Publication Date: 2006-05-03
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The process is relatively complicated and involves many operating units, so the required fixed investment is relatively large, and the operation and management costs are also relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present invention comprises the following steps:

[0015] (1) The washing sewage in the laundry room first passes through the grid, and the distance between the grid bars is less than or equal to 30mm. After removing the large suspended matter in the sewage, it enters the anaerobic hydrolysis tank;

[0016] (2) The effluent through the shed enters the anaerobic hydrolysis acidification tank. In the anaerobic hydrolysis acidification tank, the sludge concentration is 12.5g / L, and the hydraulic retention time is 15hr. In this process, the anaerobic activated sludge hydrolyzes and acidifies the macromolecular LAS and organic matter in the sewage into small molecular organic matter, and the effluent enters the membrane bioreactor;

[0017] The anaerobic activated sludge is composed of an acid-producing bacterial community, performs metabolic activities under anaerobic conditions, and can secrete extracellular enzymes to catalyze the decomposition of macromolecular orga...

Embodiment 2

[0022] The present invention comprises the following steps:

[0023] (1) The washing sewage in the laundry room first passes through the grid, and the distance between the grid bars is less than or equal to 30mm. After removing the large suspended matter in the sewage, it enters the anaerobic hydrolysis tank;

[0024] (2) The effluent through the shed enters the anaerobic hydrolysis acidification tank. In the anaerobic hydrolysis acidification tank, the sludge concentration is 2.5g / L, and the hydraulic retention time is 5hr. In this process, the anaerobic activated sludge hydrolyzes and acidifies the macromolecular LAS and organic matter in the sewage into small molecular organic matter, and the effluent enters the membrane bioreactor;

[0025] The anaerobic activated sludge is mainly composed of acid-producing bacterial communities, which perform metabolic activities under anaerobic conditions and can secrete extracellular enzymes to catalyze the decomposition of macromolecu...

Embodiment 3

[0030] The present invention comprises the following steps:

[0031] (1) The washing sewage in the laundry room first passes through the grid, and the distance between the grid bars is less than or equal to 30mm. After removing the large suspended matter in the sewage, it enters the anaerobic hydrolysis tank;

[0032](2) The effluent through the grid enters the anaerobic hydrolysis acidification tank. In the anaerobic hydrolysis acidification tank, the sludge concentration is 35.0g / L, and the hydraulic retention time is 48hr. In this process, the anaerobic activated sludge hydrolyzes and acidifies the macromolecular LAS and organic matter in the sewage into small molecular organic matter, and the effluent enters the membrane bioreactor;

[0033] The anaerobic activated sludge is mainly composed of acid-producing bacterial communities, which perform metabolic activities under anaerobic conditions and can secrete extracellular enzymes to catalyze the decomposition of macromolec...

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Abstract

The recycle method for railway washing sewage comprises steps shown below: (1) removing the seston in sewage by grid screen to flow into anaerobic hydrolysis pond; (2) acidifying the LAS in sewage and organic into micromolecular organic by anaerobic active sludge; (3) entering membrane bioreactor, oxidizing said organic into carbon dioxide and water totally by aerobic active sludge, and recycling the residual clear water with material less than intercept diameter. This method uses MBR as main body and has high efficiency with low cost.

Description

technical field [0001] The invention relates to a method in the technical field of environmental protection, in particular to a method for recycling railway washing sewage. Background technique [0002] The detergent used in the laundry room of the railway industry is composed of surfactants and some auxiliaries, and detergents containing anionic surfactants are the most widely used. The main component of anionic surfactants is sodium linear alkylbenzene sulfonate (LAS), which is not a single compound, and may include several or all related 26 compounds with different chain lengths and isomers. Auxiliaries are mainly composed of detergent builders, bleaching agents, optical brighteners, anti-corrosion agents, foam regulators, enzymes and other auxiliary components. Anionic surfactants are a wide range of water pollutants with long-lasting and chronic toxicity, and their toxic effects on humans, animals and plants, especially aquatic organisms cannot be ignored. In addition...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/12C02F3/28
CPCY02W10/10
Inventor 何义亮靳强李春杰张文英
Owner SHANGHAI JIAO TONG UNIV
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