CN103011539A

CN103011539A - Sludge deodorization method

Info

Publication number: CN103011539A
Application number: CN2012105954430A
Authority: CN
Inventors: 邵敏
Original assignee: Changzhou University
Current assignee: Changzhou University
Priority date: 2012-12-07
Filing date: 2012-12-07
Publication date: 2013-04-03

Abstract

本发明公开了一种污泥除臭方法，本发明向污泥中加入水达到掩盖污泥为宜；然后向污泥中添加熟石灰和硫代硫酸钠搅拌；厌氧发酵，通入氧气，进行曝气处理，最后脱水压干后即可得到除臭污泥。本发明可实现污泥的除臭除毒和资源化利用，并且操作简单，成本较低，具有良好的推广价值。The invention discloses a sludge deodorization method. It is advisable to add water to the sludge to cover the sludge; then add slaked lime and sodium thiosulfate to the sludge for stirring; anaerobic fermentation, feed oxygen, and carry out Aeration treatment, and finally dehydration and pressure drying to obtain deodorized sludge. The invention can realize deodorization, detoxification and resource utilization of sludge, and has simple operation, low cost and good popularization value.

Description

A kind of sludge deodorization method

Technical field

The invention discloses a kind of sludge deodorization method, belong to technical field of chemistry.

Background technology

Because rapid urban, environmental protective measure relatively lags behind, and many rivers, lake, port pollution are serious, have caused such as water quality deterioration, bed mud blackout, ecological damage, water body and have produced the environmental problems such as serious stench.

The municipal sewage plant is in processing life and trade effluent process, can produce a large amount of mud, owing to containing a large amount of organic humus and containing the toxic heavy metal compositions such as chromium, good fortune, mercury, lead, copper, zinc, therefore all there is the problem of stench and heavy metal toxicity pollution in the mud.The municipal sewage plant is a lot of to the processing disposal way of mud at present, the anhydration and incineration of employing is arranged, the digestion producing methane is arranged, sludge composting is arranged, mud potting grain etc. is arranged, and mostly take to abandon down the sea or send mountain valley, depression landfill.These ways all do not solve stench and the heavy metal pollution problem of mud well.

In recent years, various places government has all strengthened the control to source of pollution, and the pollution load that enters the water bodys such as river, lake, harbour reduces year by year; But because passing for many years pollutent continues to accumulate in the bed mud, cause bed mud still to distribute stench, environment structure is in the neighbourhood created disturbances to, particularly when the low tide bed mud surfaced, the stench problem was even more serious.

Traditionally, dredging often is regarded as a kind of method of deodorizing, yet in fact it can not successfully effect a radical cure the water body stench.Because no matter how advanced the technology of dredging is, its process is all inevitably with the polluted bed mud diffusion, because mud is loose in essence.So after dredging works is finished, although the thickness of bed mud reduces to some extent, it exposes area to the open air and does not still subtract, so the stink of subduction is limited, and thoroughly deodorizing.At present, there is not yet the report of original position deodorizing device, develop a kind of equipment that can be in position mud be carried out deodorizing and have important practical significance.

Summary of the invention

The present invention provides a kind of sludge deodorization method for overcoming the deficiencies in the prior art, and the present invention can realize the deodorizing of mud except poison and recycling, and simple to operate.

Preparation method of the present invention is:

(1) mud is entered deep-well anaerobic sludge pond, add entry, be advisable to cover mud;

(2) add white lime and Sulfothiorine in deep-well mud, stir, temperature remains on 38～55 ℃;

(3) anaerobically fermenting is 3～5 days, until mud becomes the sposh state with water;

(4) pass into oxygen, carry out Air Exposure, so that dissolved oxygen reaches more than the 2.0mg/L in the mud mixture;

(5) add cationic polyacrylamide, make sludge dewatering;

(6) after pressing dry, pressure filter can obtain the mud of deodorizing.

When the pH of mud value rises to alkalescence, add a certain amount of hydrochloric acid and make the pH value be reduced to 5.5～6.5.

When the pE of mud value rises to zero when above, add a certain amount of Sulfothiorine so that the pE value drop to-below the 100mV.

Technical scheme of the present invention is: this sludge deodorization method is to add entry to reach and cover mud and be advisable in mud; Then in mud, add white lime and Sulfothiorine stirring; Anaerobically fermenting passes into oxygen, carries out Air Exposure, can obtain deodorizing mud after dehydration press dry at last.

The present invention compares the characteristics that have with existing method for sludge treatment: the stench that can effectively eliminate the mud of sewage work's generation; The effectively heavy metal contamination in the mud of elimination sewage work generation; Do not produce the secondary pollutions such as gas, water, dirt, slag in the process of lignin-sludge; Adopt ordinary process and the equipment of Chemical Manufacture, one-time investment is few, and simple to operate, and cost is lower, has good promotional value.

The specific examples case

Example 1:

(2) add white lime and Sulfothiorine in deep-well mud, stir, temperature remains on 38 ℃;

(3) anaerobically fermenting is 3 days, until mud becomes the sposh state with water;

(4) pass into oxygen, carry out Air Exposure, so that dissolved oxygen reaches 2.0mg/L in the mud mixture;

(5) add cationic polyacrylamide, make sludge dewatering;

(6) after pressing dry, pressure filter can obtain the mud of deodorizing.

Example 2:

(2) add white lime and Sulfothiorine in deep-well mud, stir, temperature remains on 45 ℃;

(3) anaerobically fermenting is 4 days, until mud becomes the sposh state with water;

(4) pass into oxygen, carry out Air Exposure, so that dissolved oxygen reaches more than the 5.0mg/L in the mud mixture;

(5) add cationic polyacrylamide, make sludge dewatering;

(6) after pressing dry, pressure filter can obtain the mud of deodorizing.

Example 3:

(2) add white lime and Sulfothiorine in deep-well mud, stir, temperature remains on 55 ℃;

(3) anaerobically fermenting is 5 days, until mud becomes the sposh state with water;

(4) pass into oxygen, carry out Air Exposure, so that dissolved oxygen reaches more than the 7.0mg/L in the mud mixture;

(5) add cationic polyacrylamide, make sludge dewatering;

(6) after pressing dry, pressure filter can obtain the mud of deodorizing.

Claims

1. A sludge deodorization method, characterized in that:

(1) Discharge the sludge into the deep well anaerobic sludge tank and add water to cover the sludge;

(2) Add slaked lime and sodium thiosulfate to the deep well sludge, stir, and keep the temperature at 38-55°C;

(3) Anaerobic fermentation for 3 to 5 days until the sludge and water become a thin mud state;

(4) Introduce oxygen and perform aeration treatment, so that the dissolved oxygen in the mud-water mixture reaches more than 2.0mg/L;

(5) Add cationic polyacrylamide to dehydrate the sludge;

(6) Deodorized sludge can be obtained after being dried by a filter press.

2. A sludge deodorization method according to claim 1, characterized in that: when the pH value of the sludge rises to alkaline, a certain amount of hydrochloric acid is added to reduce the pH value to 5.5-6.5.

3. A method for sludge deodorization according to claim 1, characterized in that: when the pE value of the sludge rises above zero, a certain amount of sodium thiosulfate is added so that the pE value drops to -100mV the following.