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Method for anaerobic-aerobiotic-microbial flocculation reinforced wastewater treatment

A technology of microbial flocculation and microbial flocculant, which is applied in the field of anaerobic-aerobic-biological flocculation enhanced treatment of wastewater, can solve problems such as difficult removal, insufficient carbon source, obstacles to wastewater treatment and resource utilization, etc., to achieve reduction of chroma and Effects of turbidity and improvement of biodegradability

Inactive Publication Date: 2014-08-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of urban and rural industrialization in my country, the industrial wastewater content in municipal sewage is getting higher and higher. The industrial wastewater content of sewage treatment plants in many industrial development zones or economic parks exceeds 80%, and the biodegradability of sewage is extremely poor. Sewage treatment The difficulty is getting bigger and bigger, and the treatment cost is getting higher and higher, but the effluent still cannot meet the national mandatory discharge standards
The traditional activated sludge treatment process can no longer fully meet the current increasingly stringent municipal sewage discharge requirements
[0003] Among them, the content of ammonia nitrogen and COD in high-concentration organic wastewater is very high, and the carbon source in the denitrification process is insufficient. The traditional treatment mode often achieves the standard of COD, but it is difficult to reach the standard of total nitrogen, and the wastewater contains a large amount of suspended particles that are not easy to settle. Soluble microbial products, etc., not easily removed or biodegraded
None of the wastewater treatment methods in the prior art can fully meet the requirements for removing the above-mentioned substances and content, which has brought obstacles to wastewater treatment and resource utilization

Method used

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  • Method for anaerobic-aerobiotic-microbial flocculation reinforced wastewater treatment
  • Method for anaerobic-aerobiotic-microbial flocculation reinforced wastewater treatment
  • Method for anaerobic-aerobiotic-microbial flocculation reinforced wastewater treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) The simulated wastewater to be treated in the laboratory first enters the regulating tank, and the aeration pipe is set to pre-aerate the wastewater to be treated, and the aeration intensity is 160m 3 / (h·m 3 ), using the pipe-through aeration method, each aeration pipe is composed of 3 groups of 45° air holes, so that the wastewater to be treated can be mixed evenly and its pH value can be adjusted to 6-8;

[0035] 2) Pass the wastewater treated in the regulating tank through the grid device to remove larger floating objects and impurities in the wastewater;

[0036] 3) Pump the effluent from 2) into the quick mixing tank, add flocculant PAC to the quick mixing tank for flocculation pre-sedimentation to effectively remove suspended solids and colloidal substances in the raw water, the optimal dosage of flocculant PAC is 180mg / L, stir rapidly at a speed of 220r / min for 5min, then stir slowly at a speed of 80r / min for 15min, then stop stirring and let it stand for 3...

Embodiment 2

[0044]1) The simulated wastewater to be treated in the laboratory first enters the regulating tank, and the aeration pipe is set to pre-aerate the wastewater to be treated, and the aeration intensity is 165m 3 / (h·m 3 ), using the pipe-through aeration method, each aeration pipe is composed of 3 groups of 45° air holes, so that the wastewater to be treated can be mixed evenly and its pH value can be adjusted to 6-8;

[0045] 2) Pass the wastewater treated in the regulating tank through the grid device to remove larger floating objects and impurities in the wastewater;

[0046] 3) Pump the effluent from 2) into the quick-mixing tank, and add flocculant PAC to the quick-mixing tank for flocculation pre-sedimentation to effectively remove suspended solids and colloidal substances in the raw water. The optimal dosage of flocculant PAC is 185mg / L, stir rapidly at a speed of 220r / min for 5min, then stir slowly at a speed of 80r / min for 15min, then stop stirring and let it stand fo...

Embodiment 3

[0054] 1) The wastewater to be treated first enters the regulating tank, and the aeration pipe is set to pre-aerate the wastewater to be treated, and the aeration intensity is 170m 3 / (h·m 3 ), using the pipe-through aeration method, each aeration pipe is composed of 3 groups of 45° air holes, so that the wastewater to be treated can be mixed evenly and its pH value can be adjusted to 6-8;

[0055] 2) Pass the wastewater treated in the regulating tank through the grid device to remove larger floating objects and impurities in the wastewater;

[0056] 3) Pump the effluent from 2) into the quick mixing tank, and add flocculant PAC to the quick mixing tank for flocculation pre-sedimentation to effectively remove suspended solids and colloidal substances in the raw water. The optimal dosage of flocculant PAC is 190mg / L, stir rapidly at a speed of 220r / min for 5min, then stir slowly at a speed of 80r / min for 15min, then stop stirring and let it stand for 30min, discharge the floc...

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Abstract

The invention discloses a method for anaerobic-aerobiotic-microbial flocculation reinforced wastewater treatment. The method comprises the following steps of: 1) treating the wastewater to be treated in a regulation tank; 2) removing large floating matters and impurities out of the wastewater (treated in the regulation tank) by a grating device; 3) pumping the effluent obtained in the step 2) in a quick mixing tank, and adding a flocculant PAC (poly aluminium chloride) in the quick mixing tank and carrying out flocculation pre-precipitate; 4) carrying out anaerobic-aerobiotic treatment; 5) feeding the water body in a secondary sedimentation tank and adding 7.5vol% of a microbial flocculation agent and 5vol% of CaCl2 solution with a concentration of 1-1.5%, mixing for 8-10 minutes and then enabling the liquid to pass through a high-performance ceramic filter material with a particle size of 3-5mm and a quartz sand cushion laid on the bottom of the high-performance ceramic filter material; and 6) feeding the effluent obtained in the step 5) in an attapulgite adsorption tank for further adsorption bleaching, removing micropollutants, and disinfecting the effluent, wherein attapulgite is arranged in the attapulgite adsorption tank, a Pt metal screen is arranged on the attapulgite, and the attapulgite is loaded with Fe2O3 or CuO and NaCl; and finally draining water in a water collection tank.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a new method for anaerobic-aerobic-biological flocculation enhanced treatment of waste water. Background technique [0002] With the rapid development of urban and rural industrialization in my country, the industrial wastewater content in municipal sewage is getting higher and higher. The industrial wastewater content of sewage treatment plants in many industrial development zones or economic parks exceeds 80%, and the biodegradability of sewage is extremely poor. Sewage treatment The difficulty is getting bigger and bigger, and the treatment cost is getting higher and higher, but the effluent still cannot meet the national mandatory discharge standards. The traditional activated sludge treatment process can no longer fully meet the current increasingly stringent municipal sewage discharge requirements. [0003] Among them, the content of ammonia nitrogen and COD...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 耿金菊任洪强许柯丁丽丽
Owner NANJING UNIV
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