CN100402449C

CN100402449C - Production technology of preparing aminosal using hydrolysed residual active sludge by quick lime and its equipment

Info

Publication number: CN100402449C
Application number: CNB2006100190637A
Authority: CN
Inventors: 汪常青; 李亚东; 梁浩
Original assignee: WUHAN URBAN DRAINAGE DEVELOPMENT Co Ltd; Hubei University
Current assignee: WUHAN URBAN DRAINAGE DEVELOPMENT Co Ltd; Hubei University
Priority date: 2006-05-15
Filing date: 2006-05-15
Publication date: 2008-07-16
Anticipated expiration: 2026-05-15
Also published as: CN1868929A

Abstract

The present invention provides a production process and a device for preparing aminosal by using excess activated sludge hydrolyzed by quick lime which is suitable for commercial process. The process has the steps: mixing the excess activated sludge, water and the calcium lime according to the proportion of 1/1/0.06, and sitirring the mixture for 20 to 30 minutes; sucking the mixed liquor into a hydrolysis reaction vessel for hydrolyzation for 1 to 3 hours at the working pressure between 0.4 and 0.7MPa and at the hydrolysis temperature between 135 DEG C and 150 DEG C; filtering obtained materials after the hydrolyzation; regulating a pH value of filtering liquor to 7.0 to 8.5 by hydrochloric acid; then, condensing the obtained materials. The filtering liquor became an aminosal concentrated solution when the protein concentration is 21 Be<0>, and the aminosal concentrated solution can be dried into dry aminosal products. The present invention uses the excess activated sludge to prepare the aminosal, has advantages of wide sources, low production cost and waste utilization, and is favourable for environmental protection. Excess activated sludge aminosal fire foam prepared by using the production process meets national standard requirements.

Description

The production technique that is equipped with protein hydrolysate with unslaked lime hydrolysis made from residual actived sludge

Technical field

What the present invention relates to is the urban domestic sewage sludge treatment technology, particularly is equipped with the production technique of protein hydrolysate with unslaked lime hydrolysis made from residual actived sludge.

Background technology

There are a large amount of residual active sludges in city domestic sewage in handling, and a large amount of organism is contained in the inside.The big city is produced about 500,000 tons per year, has begun to cause for the second time to pollute; With regard to its treatment process or utilize again and mainly comprise following several respects: 1, make fertilizer; 2, burn; 3, as material of construction; 4, landfill; 5, throw the sea; 6, the biochemical process sludge reduction is handled, but aforesaid method is to the processing of excess sludge or utilize and all have more shortcoming.

If at present the fire-fighting medium owner of the house where a fire started that uses of fire-fighting fire extinguishing field is with Al (OH) ₃Fire foam and NaHCO3, NaCl are in powder fire-fighting medium, vegetable-protein fire-fighting medium or animal proteinum fire-fighting medium.Wherein, animal protein is to form with lime, HCl hydrolysis with things such as animal hair, hoof, angles.And plant protein all is with extracting in the grain and oil industrial wood waste at present both at home and abroad.Animal protein fire-fighting medium and chemical easily pollute environment in the existing market, and the plant protein fire-fighting medium is originated less, the production cost height, are not suitable for the fire-fighting fire extinguishing field and use.

Chinese patent " sewage disposal produces the processing of active sludge and extracts the method for sludge protein matter " (number of patent application 02116227) provides a kind of active sludge protein extracting process and has been used for fuel or the purposes of feed.But its operation pressure is low, and technological temperature is low, and it is low to extract the protein rate, is not suitable for suitability for industrialized production.Seeking the new production method of protein that the source is wide, cost is low is problem anxious to be solved.

Summary of the invention

The unslaked lime hydrolysis made from residual actived sludge that the purpose of this invention is to provide a kind of suitable suitability for industrialized production is equipped with the production technique of protein hydrolysate.

The present invention realizes like this.Its method is following steps:

1, residual active sludge pre-treatment: residual active sludge, water, unslaked lime are joined in the mixing tank in 1: 1: 0.06 ratio, cover sealing cover, electronic stirring 20-30 minute, the mixed solution that stirs is joined in the hydrolytic reaction pot.

2, hydrolysis: the sealing hydrolytic reaction pot, steam is fed reactor, arrange freezing air simultaneously, temperature rises and closes vent valve about 100 ℃ the time; In operating pressure is that 0.4-0.7Mpa, hydrolysis temperature are that hydrolysis time is 1-3h, and mixed solution is hydrolyzed under 135 ℃-155 ℃ the condition.Constantly feed steam when being incubated in the hydrolytic process and stir the hydrolysis mixed solution.

3, filter: after hydrolysis finishes, utilize in the reactor residual pressure to carry out direct filtration, filter plant is the plate and frame filter, and specification is 40-80m ², filter when finishing and utilize steam excess sludge residue in the sheet frame to be carried out purge, the filter residue otherwise processed.

4, concentrated filtrate: is 7.0-8.5 with filtered liquid with the salt acid for adjusting pH value.In the long tube thickening equipment, concentrate, when protein concn is 21Be °, get final product.Concentrating the liquid packing as protein dispatches from the factory.

5, protein is concentrated liquid with spray-drier spraying drying under 100-110 ℃ of condition, get protein dry product packing and dispatch from the factory.

Protein is concentrated liquid add quantitative stablizer, sanitas, frostproofer, tensio-active agent, just be mixed with efficient, inexpensive residual active sludge protein foam fire-fighting medium.

Perhaps the protein dry product is added the water-soluble concentrated solution that changes into, add quantitative stablizer, sanitas, frostproofer, tensio-active agent again, just be mixed with efficient, inexpensive residual active sludge protein foam fire-fighting medium.

The present invention compared with prior art has obvious advantage, wide material sources, and production cost is low, and utilization of waste material is environmental.Viscosity, yield point, sediment, stability, corrosion rate, foam expansion, 90% flame period, attack time, anti-burning time with the residual active sludge protein foam fire-fighting medium of the present invention preparation all meet national standard.

Embodiment

Embodiment 1

1), residual active sludge pre-treatment: 2 tons of residual active sludges, 2 tons in water, unslaked lime 120kg (by 1: 1: 0.06 part by weight) are joined 10m ³Mixing tank in, cover sealing cover, electronic stirring 20 minutes is pumped into 5m with the mixed solution that stirs ³In the hydrolytic reaction pot.

2), hydrolysis: the sealing hydrolytic reaction pot, steam is fed reactor, arrange freezing air simultaneously, temperature rises and closes vent valve about 100 ℃ the time; In operating pressure is that 0.5Mpa, hydrolysis temperature are that hydrolysis time is 2.5h, and mixed solution is hydrolyzed under 145 ℃ the condition.When being incubated in the hydrolytic process not section feed a steam and stir the hydrolysis mixed solution.

3), filter: after hydrolysis finishes, be 80m with specification ²The plate and frame filter filter.

4), concentrated filtrate: filtered liquid is regulated P H value 7.0-8.5.In the long tube thickening equipment, concentrate, when protein concn is 21Be °, get final product.Concentrating the liquid packing as protein dispatches from the factory.

5), protein is concentrated liquid with spray-drier spraying drying under 100-110 ℃ of condition, protein dry product packing is dispatched from the factory.

Embodiment 2

1), residual active sludge pre-treatment: 4 tons of residual active sludges, 4 tons in water, unslaked lime 240kg (in 1: 1: 0.06 ratio) are joined 15m ³Mixing tank in, cover sealing cover, electronic stirring 20 minutes is pumped into two 5m with the mixed solution that stirs ³In the hydrolytic reaction pot.

2), hydrolysis: the sealing hydrolytic reaction pot, steam is fed reactor, arrange freezing air simultaneously, temperature rises and closes vent valve about 100 ℃ the time; In operating pressure is that 0.6Mpa, hydrolysis temperature are that hydrolysis time is 2h, and mixed solution is hydrolyzed under 155 ℃ the condition.When being incubated in the hydrolytic process not section feed a steam and stir the hydrolysis mixed solution.

4), concentrated filtrate: with filtered liquid salt acid for adjusting pH value 7.0-8.5.In the long tube thickening equipment, concentrate, when protein concn is 21Be °, get final product.Concentrating the liquid packing as protein dispatches from the factory.

Embodiment 3

1), residual active sludge pre-treatment: 2 tons of residual active sludges, 2 tons in water, unslaked lime 120kg (in 1: 1: 0.06 ratio) are joined 10m ³Mixing tank in, cover sealing cover, electronic stirring 20 minutes is pumped into 5m with the mixed solution that stirs ³In the hydrolytic reaction pot.

2), hydrolysis: the sealing hydrolytic reaction pot, steam is fed reactor, arrange freezing air simultaneously, temperature rises and closes vent valve about 100 ℃ the time; In operating pressure is that 0.4Mpa, hydrolysis temperature are that hydrolysis time is 3h, and mixed solution is hydrolyzed under 135 ℃ the condition.When being incubated in the hydrolytic process not section feed a steam and stir the hydrolysis mixed solution.

4), concentrated filtrate: filtered liquid is regulated pH value 7.0-8.5.In the long tube thickening equipment, concentrate, when protein concn is 21Be °, get final product.Concentrating the liquid packing as protein dispatches from the factory.

Claims

1. one kind is equipped with the production technique of protein hydrolysate with unslaked lime hydrolysis made from residual actived sludge, it is characterized in that processing step is as follows:

1), residual active sludge pre-treatment: residual active sludge, water, unslaked lime are joined in the mixing tank by 1: 1: 0.06 part by weight, cover sealing cover, electronic stirring 20-30 minute, the mixed solution that stirs is pumped in the hydrolytic reaction pot;

2), hydrolysis: the sealing hydrolytic reaction pot, steam is fed reactor, arrange freezing air simultaneously, temperature rises and closes vent valve about 100 ℃ the time; In operating pressure is that 0.4-0.7Mpa, hydrolysis temperature are that hydrolysis time is 1-3h under 135 ℃-150 ℃ the condition, and mixed solution is hydrolyzed, and constantly feeds steam when being incubated in the hydrolytic process and stirs the hydrolysis mixed solution;

3), filter: after hydrolysis finishes, utilize in the reactor residual pressure to carry out direct filtration, filter plant is the plate and frame filter, and specification is 40-80m ², filter when finishing and utilize steam that excess sludge residue in the sheet frame is carried out purge;

4), concentrated filtrate: filtered liquid with salt acid for adjusting pH value 7.0-8.5, is concentrated in the long tube thickening equipment, when protein concn is 21Be ⁰In time, can be used as contract liquid packing of protein compression and dispatches from the factory;