阅读说明：本技术 一种高含水率淤泥资源化利用的方法 (Resource utilization method for high-water-content sludge ) 是由 刘坚 苏凡 吴跃东 李旭 陈亮 于 2020-03-05 设计创作，主要内容包括：本发明公开了一种高含水率淤泥资源化利用的方法,包括如下步骤：步骤SS1：取一定量的高含水率淤泥,向其中加入絮凝剂；步骤SS2：待淤泥中产生絮凝现象并达到稳定后,利用抽水设备,抽去上层清液；步骤SS3：将被土工布包裹的吸水剂投入到抽去所述上层清液的淤泥中吸水,直至淤泥已无法进一步脱水；步骤SS4：向脱水处理后的淤泥中加入胶凝材料,充分搅拌,制备得到填充砖或路基填筑材料。本发明克服了传统高含水率淤泥处理耗时久、成本高、处理不充分的缺点,具有成本低、速度快、经济效益好,可就地处理等特点。(The invention discloses a method for resource utilization of high-water-content sludge, which comprises the following steps: step SS 1: taking a certain amount of sludge with high water content, and adding a flocculating agent into the sludge; step SS 2: after the flocculation phenomenon is generated in the sludge and the sludge is stable, pumping out supernatant liquor by using pumping equipment; step SS 3: putting the water absorbent wrapped by the geotextile into the sludge with the supernatant liquid removed for water absorption until the sludge cannot be further dehydrated; step SS 4: and adding a cementing material into the dewatered sludge, and fully stirring to prepare the filling brick or roadbed filling material. The method overcomes the defects of long time consumption, high cost and insufficient treatment of the traditional high-water-content sludge treatment, and has the characteristics of low cost, high speed, good economic benefit, on-site treatment and the like.)

1. A method for resource utilization of high-water-content sludge is characterized by comprising the following steps:

step SS 1: taking a certain amount of sludge with high water content, and adding a flocculating agent into the sludge;

step SS 2: after the flocculation phenomenon is generated in the sludge and the sludge is stable, pumping out supernatant liquor by using pumping equipment;

step SS 3: putting the water absorbent wrapped by the geotextile into the sludge with the supernatant liquid removed for water absorption until the sludge cannot be further dehydrated;

step SS 4: and adding a cementing material into the dewatered sludge, and fully stirring to prepare the filling brick or roadbed filling material.

2. The method for recycling the high-water-content sludge as claimed in claim 1, wherein the water content of the sludge in the step SS1 exceeds 100%.

3. The method for recycling the sludge with the high water content as claimed in claim 1, wherein the flocculant in the step SS1 is Polyacrylamide (PAM).

4. The method for recycling sludge with high water content as claimed in claim 3, wherein the addition amount of the flocculating agent is 3-8 per mill of the total mass of the sludge.

5. The method for recycling sludge with high water content as claimed in claim 1, wherein the water absorbent in the step SS3 is SAP particles.

6. The method for recycling sludge with high water content as claimed in claim 5, wherein the SAP particles are added in an amount of 5-10kg/m during sludge cultivation.

7. The method for recycling sludge with high water content as claimed in claim 5, wherein after the high water-content sludge is saturated by water absorption, the SAP particles with the high water-absorbing resin are placed in a high ion concentration solution along with geotextile or subjected to sun exposure for dehydration, and then are recycled.

8. The method for recycling the high-water-content sludge as claimed in claim 1, wherein the cementing material in the step SS4 is cement.

9. The method for recycling sludge with high water content as claimed in claim 8, wherein the addition amount of the cement used for preparing the roadbed filling material is 3% -5% of the total mass of the sludge.

10. The method for recycling sludge with high water content as claimed in claim 8, wherein the cement used for preparing the filling bricks is added in an amount of 10% -20% of the total mass of the sludge.

Technical Field

The invention relates to a method for resource utilization of high-water-content sludge, and belongs to the technical field of sludge treatment.

Background

Sludge is one of the important sources of urban pollutants. Along with the continuous improvement of the environmental protection consciousness of people, the dredging work of rivers and lakes is also gradually promoted. In the dredging work, how to treat a large amount of sludge becomes a problem to be solved urgently. Such sludges tend to have very high water content and are very difficult to transport outside and require on-site treatment. The existing dehydration treatment technology usually utilizes machinery to compact and drain on the spot, and the method has the disadvantages that firstly, discharged water flows into a river channel and a lake again to bring rework, secondly, in the mechanical compaction process, sludge can not be fixed, the compaction process is actually the process that the sludge is extruded and laterally deformed, the compaction efficiency is low, the time and the labor are consumed in sludge treatment, thirdly, sludge can not be recycled, the treated sludge still needs to be transported outside, the water content is still higher, the strength is lower, and the sludge can not be utilized. Therefore, a new method for resource utilization of the sludge with high water content needs to be found, which can not only avoid rework, but also accelerate the treatment speed and reduce the treatment cost, and can also utilize the treated sludge in a commercialized manner, thereby bringing good economic benefits.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method for recycling sludge with high water content, which can finally convert sludge with high water content into building material products or building materials for utilization so as to solve the problems of difficult, slow and high cost treatment of sludge with high water content.

In order to solve the technical problem, the invention provides a method for resource utilization of high-water-content sludge, which is characterized by comprising the following steps of:

step SS 1: taking a certain amount of sludge with high water content, and adding a flocculating agent into the sludge;

step SS 2: after the flocculation phenomenon is generated in the sludge and the sludge is stable, pumping out supernatant liquor by using pumping equipment;

step SS 3: putting the water absorbent wrapped by the geotextile into the sludge with the supernatant liquid removed for water absorption until the sludge cannot be further dehydrated;

step SS 4: and adding a cementing material into the dewatered sludge, and fully stirring to prepare the filling brick or the roadbed filling material.

As a preferred embodiment, the moisture content of the sludge in step SS1 exceeds 100%.

As a preferred embodiment, the flocculant in step SS1 is polyacrylamide PAM.

As a preferred embodiment, the addition amount of the flocculating agent is 3-8 per mill of the total mass of the sludge.

As a preferable example, the water absorbing agent in step SS3 is SAP particles of a high molecular water absorbent resin.

As a preferred embodiment, the SAP particles are added in an amount of 5-10kg/m to thin a sludge mass.

In a preferred embodiment, after the SAP particles absorb water and are saturated, the SAP particles are placed in a high ion concentration solution or exposed to sunlight together with geotextile for dehydration, and then are recycled.

In a preferred embodiment, the cement is used as the cementing material in step SS 4.

As a preferred embodiment, the cement is added in an amount of 3-5% of the total mass of the sludge to prepare the roadbed filling material.

As a preferred embodiment, the cement is added in an amount of 10-20% by mass based on the total mass of the sludge.

The invention achieves the following beneficial effects: 1. the method can treat the sludge with high water content, and the traditional treatment method can only treat the sludge with the water content of less than 100 percent, so the method has wider application range. 2. The method simultaneously applies the flocculating agent and the water absorbent to treat the sludge with high water content, compared with a method only using the flocculating agent, the method has the advantages that the treatment is more sufficient, the water content of the obtained sludge is lower, and the mechanical strength is higher; the method of the present invention requires a smaller amount of water-absorbing agent and is less costly than a method using only the water-absorbing agent. 3. Compared with the traditional method for treating by utilizing mechanical in-situ compaction drainage, the method can utilize sludge as resources, and has higher social benefit; compared with the method for preparing the building material product by directly adding cement and lime, the method of the invention needs less cement, and the obtained building material product has higher mechanical strength and higher economic benefit.

Drawings

FIG. 1 is a schematic diagram of a method for resource utilization of high water content sludge according to the present invention.

The method comprises the following steps of 1-beaker, 2-high-water-content sludge, 3-flocculating agent, 4-injector, 5-geotextile, 6-water absorbent, 7-cement, 8-roadbed filling material and 9-filling brick.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, the invention provides a method for resource utilization of high-moisture content sludge, which comprises the following steps:

step 1: taking a certain amount of sludge with high water content, and adding a flocculating agent into the sludge;

step 2: after the flocculation phenomenon is generated in the sludge and the sludge is stable, pumping out supernatant liquor by using pumping equipment;

and step 3: putting the water absorbent wrapped by the geotextile into the sludge from which the clear liquid is extracted for water absorption until the sludge cannot be further dehydrated;

and 4, step 4: and adding a cementing material into the dewatered sludge, and fully stirring to prepare the filling brick or roadbed filling material.

Further, the water content of the high water content sludge 2 exceeds 100%, and the sampled high water content sludge is placed in the beaker 1.

Further, the flocculating agent 3 can be selected from polyacrylamide PAM, and the addition amount of the flocculating agent 3 is 3-8 per mill of the total mass of the high-water-content sludge 2.

Further, after the flocculant 3 is added, the flocculant and the high water content sludge 2 are sufficiently stirred by using a glass rod, and after standing for 24 hours, a supernatant liquid is extracted by using an injector 4.

Further, high molecular water absorbent resin SAP particles can be selected as the water absorbent agent 6, the addition amount of the SAP particles is 5-10kg/m high water content sludge 2, the water absorbent agent 6 has the characteristics of water absorption expansion and water loss contraction, in order to reduce cost, the water absorbent agent 6 can be wrapped by the geotextile 5 in advance, the geotextile 5 is put into the sludge 2 filtered out of clear liquid during use, and the sludge is placed in a high ion concentration solution or exposed to the sun for dehydration after full water absorption, so that the reutilization can be realized.

Further, as for the sludge 2 with high water content after the dehydration treatment, cement is selected as a cementing material, and if a roadbed filling material 8 is to be prepared, cement 7 which is about 3-5% of the total mass of the sludge 2 can be added; if the filling brick 9 is to be made, cement 7 may be added thereto in an amount of about 10% to 20% of the total mass of the high water content sludge 2.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.