CN102424512A

CN102424512A - Sludge deep dehydration method comprising wall breaking-penetrating-press filtrating process

Info

Publication number: CN102424512A
Application number: CN2011103275178A
Authority: CN
Inventors: 李磊; 何坚
Original assignee: GREAT MUD SCIENCE AND APPLICATION TECHNOLOGY RESEARCH INSTITUTE OF SUZHOU INDUSTRIAL PARK
Current assignee: GREAT MUD SCIENCE AND APPLICATION TECHNOLOGY RESEARCH INSTITUTE OF SUZHOU INDUSTRIAL PARK
Priority date: 2011-10-25
Filing date: 2011-10-25
Publication date: 2012-04-25
Anticipated expiration: 2031-10-25
Also published as: CN102424512B

Abstract

The invention relates to a sludge deep dehydration method comprising a wall breaking-penetrating-press filtrating process. The method comprises steps of: 1, a wall breaking step, wherein an organic wall breaking agent is added to sludge with a water content of 90-97%, and the mixture is mixed and stirred for no less than 5min; 2, a penetrating step, wherein a powdery penetrating agent is added to the wall-broken sludge, and the mixture is mixed and stirred for no less than 10min; 3, a press filtrating step, wherein the wall-broken and penetrated sludge is delivered to a plate-and-frame filter press by using a pump, and the water content of the sludge obtained after press filtration is 45-50%. The method is advantaged in that: the organic agent triethanolamine is adopted, the dosage of triethanolamine is extremely low, and triethanolamine can be completely burnt in a burning treatment, such that a compatibilization problem is avoided, and the heat value of the sludge is not influenced; a small amount of substances such as fly ash and coal powder is added to the penetrating system, such that penetration channels are formed, and water content in the sludge can flow freely; a common plate-and-frame filter press is adopted in the press filtrating process, the sludge regulated by using the wall breaking agent and the powder is press-filtrated in the plate-and-frame filter press, such that the water content in the sludge is reduced to below 50%.

Description

A kind of deep dehydration method for sludge that comprises broken wall-infiltration-pressure-filtering process

Technical field

The present invention relates to a kind of method of utilizing medicaments and technological process mud to be carried out deep dehydration; The not follow-up disposal of minimizing that can realize mud provides condition, reduces because of handling the foul smell, transportation, the water ratio that produce in the sludge treatment disposal process and crosses problems such as height.Moisture percentage in sewage sludge through after present method processing is reduced to below 50%, and the mud after the processing has not only reduced transportation cost, and can realize security landfill or incineration disposal.This invention belongs to the utilization of resources in environmental protection technical field.

Background technology

Along with urbanization process is accelerated the increasingly stringent with environmental standard, national and enterprise has strengthened the environmental improvement dynamics of investment, newly-built large quantities of sewage works, and the mud generation improves year by year.By the end of the year 2010, more than 3000 of municipal sewage plant built up in the whole nation, and national urban wastewater treatment firm produces 9,000,000 tons/year in moisture 80% mud; Estimate to produce 2,700 ten thousand tons in moisture 80% mud every year in the five-year.Because moisture percentage in sewage sludge is higher, be difficult to satisfy follow-up disposal requirements such as compost, landfill, pyrolysis, burning, and minimizing is not remarkable, has increased transportation cost and difficulty, so Chinese Ministry of Environmental Protection brings up to 50% with the storage standard of dispatching from the factory of moisture percentage in sewage sludge.Seek new deeply dehydrating sludge technology, realize the minimizing of mud, become the bottleneck problem of restriction sewage treatment industry.The major cause of deeply dehydrating sludge difficulty is because biological cells in sludge and colloid contain a large amount of " interstitial waters " (accounting for total moisture 70%) can't all extrude through the pressure that traditional mechanical is dewatered; Be the mucilage shape when moisture percentage in sewage sludge is between 60%～65% simultaneously; Water molecules is wrapped up by one deck colloid; This zone is referred to as mud " viscose glue phase region ", is the most difficult stage of sludge dewatering, further removes by the method for traditional mechanical dehydration is very difficult.

Summary of the invention

What the present invention proposed is a kind of deep dehydration method for sludge that comprises broken wall-infiltration-pressure-filtering process; Its purpose is intended to overcome the above-mentioned defective of existing in prior technology; The characteristics that not only have general conventional depth sludge dewatering technology, and the broken wall conditioning medicament and the more conventional dehydration technique of infiltration additive amount of medicament of product usefulness are extremely low, have avoided the incrementization of mud; Can not have a negative impact, solve the bottleneck problem that the conventional depth dehydration technique cann't be solved follow-up disposal approach.

Technical solution of the present invention: this method comprises following process step:

One, broken wall: at water ratio is to add organic broken wall medicament in 90% ~ 97% the mud, mixes churning time and is no less than five minutes, and this organic broken wall medicament is a trolamine, and trolamine accounts for 5/3/10000ths ~ ten thousand of mud weight;

Two, infiltration: add Powdered infiltration medicament in the mud behind broken wall, mix churning time and be no less than ten minutes, the powder infiltration medicament of this infiltration is flyash or coal dust, and flyash or coal dust account for per mille ~ 2/1000ths of mud weight;

Three, press filtration: the mud that will pass through broken wall and osmosis process step is delivered to mud in the plate-and-frame filter press with rampump, and the pressure of its fresh feed pump keeps 30min ~ 90min at 0.2 MPa ~ 0.5MPa under the pressure of 1.5 MPa ~ 3.0MPa; Moisture percentage in sewage sludge after the press filtration is 45.3%-48.2%.

Advantage of the present invention: the broken wall medicament of this patent adopts organic medicament trolamine, and not only addition is extremely low, and when incineration disposal, can thoroughly burn, the calorific value that can not produce the increase-volume problem and influence mud.The principle of work of trolamine is similar to the effect of tensio-active agent; The flco structure that can disperse to disintegrate mud makes the inner combination water of flco be released out, and can change the surface charge of mud; Promote extracellular polymeric (EPS) hydrolysis; Reduced avidity, induced the mud capillary water to transform, reduced the viscosity of mud to mud gap free-water to water; Osmosis system adopt to add pulvis such as a spot of flyash, coal dust, forms the passage of infiltration, guarantees that the moisture in the mud can unrestricted flow; Conventional plate-and-frame filter press is adopted in press filtration, the mud after interpolation broken wall medicament and the pulvis conditioning is sent into plate-and-frame filter press carry out press filtration, can be with below the sludge dewatering to 50%.

Embodiment

Embodiment 1

(1) broken wall adds water with the mud of water ratio 81.5% and nurses one's health water ratio 94%;

(2) infiltration, the trolamine that will account for mud weight 3/10000ths according to weight ratio adds in the mud, stirs 10 minutes;

(3) press filtration, the millesimal coal dust that will account for mud weight according to weight ratio adds in the mud churning time 10 minutes;

(4) will under the pressure of the employing rampump of the mud after broken wall, infiltration, the press filtration, be delivered to plate-and-frame filter press, press filtration 30min under the pressure of 2.2MPa at 0.3MPa;

(5) moisture percentage in sewage sludge after the press filtration is 45%.

Embodiment 2

(1) broken wall adds water with the mud of water ratio 81.5% and nurses one's health water ratio 97%;

(2) infiltration, the trolamine that will account for mud weight 5/10000ths according to weight ratio adds in the mud, stirs 8 minutes;

(3) press filtration, 2/1000ths the coal dust that will account for mud weight according to weight ratio adds in the mud churning time 13 minutes;

(4) will under the pressure of the employing rampump of the mud after broken wall, infiltration, the press filtration, be delivered to plate-and-frame filter press, press filtration 90min under the pressure of 3.0MPa at 0.5MPa;

(5) moisture percentage in sewage sludge after the press filtration is 50%.

Avoided routine techniques need add the problem of a large amount of inorganic materials, the broken wall medicament of this patent adopts organic medicament trolamine, and not only addition is extremely low, and when incineration disposal, can thoroughly burn, the calorific value that can not produce the increase-volume problem and influence mud.The principle of work of trolamine is similar to the effect of tensio-active agent; The flco structure that can disperse to disintegrate mud makes the inner combination water of flco be released out, and can change the surface charge of mud; Promote extracellular polymeric (EPS) hydrolysis; Reduced avidity, induced the mud capillary water to transform, reduced the viscosity of mud to mud gap free-water to water; Osmosis system adopt to add pulvis such as a spot of flyash, coal dust, forms the passage of infiltration, guarantees that the moisture in the mud can unrestricted flow; Conventional plate-and-frame filter press is adopted in press filtration, the mud after interpolation broken wall medicament and the pulvis conditioning is sent into plate-and-frame filter press carry out press filtration, can be with below the sludge dewatering to 50%.

Claims

1. deep dehydration method for sludge that comprises broken wall-infiltration-pressure-filtering process is characterized in that this method comprises following process step:

Three, press filtration: the mud that will pass through broken wall and osmosis process step is delivered to mud in the plate-and-frame filter press with rampump, and the pressure of its fresh feed pump keeps 30min ~ 90min at 0.2 MPa ~ 0.5MPa under the pressure of 1.5 MPa ~ 3.0MPa; Moisture percentage in sewage sludge after the press filtration is 45%-50%.