CN206384881U - A kind of sludge condensation type air-floating apparatus - Google Patents
A kind of sludge condensation type air-floating apparatus Download PDFInfo
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- CN206384881U CN206384881U CN201720038707.0U CN201720038707U CN206384881U CN 206384881 U CN206384881 U CN 206384881U CN 201720038707 U CN201720038707 U CN 201720038707U CN 206384881 U CN206384881 U CN 206384881U
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- 239000010802 sludge Substances 0.000 title claims abstract description 52
- 238000007667 floating Methods 0.000 title claims description 13
- 230000005494 condensation Effects 0.000 title claims 9
- 238000009833 condensation Methods 0.000 title claims 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000005188 flotation Methods 0.000 claims abstract description 79
- 239000002893 slag Substances 0.000 claims abstract description 16
- 238000007790 scraping Methods 0.000 claims 2
- 238000000926 separation method Methods 0.000 abstract description 13
- 239000002351 wastewater Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 5
- 238000013019 agitation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Abstract
本实用新型公开了一种污泥浓缩型气浮装置，包括气浮池和导流筒，所述导流筒竖直设置在所述气浮池中心并由所述气浮池的底部向中部延伸，所述气浮池的顶部设有刮渣机和设置在所述刮渣机下方的污泥斗，所述气浮池底部设有排水口、进水口和溶气水入口，所述排水口设置在所述导流筒外，所述进水口和溶气水入口设置在所述导流筒的底部，所述进水口连接进水管，所述进水管上设有进水泵，所述溶气水入口经溶气水管连接至排水管，所述溶气水管上设有溶气泵，所述污泥斗的底部设有污泥排口，所述污泥排口设有延伸至所述气浮池外的排泥管。本实用新型提供的污泥浓缩型气浮装置，可用于高浓度悬浮物废水的泥水分离。
The utility model discloses a sludge concentration type air flotation device, which comprises an air flotation tank and a guide tube, the guide tube is vertically arranged at the center of the air flotation tank and extends from the bottom of the air flotation tank to the middle. The top of the air flotation tank is provided with a slag scraper and a sludge bucket arranged under the slag scraper, and the bottom of the air flotation tank is provided with a drain, a water inlet and a dissolved air water inlet, and the drain is arranged on the Outside the guide cylinder, the water inlet and the dissolved air water inlet are arranged at the bottom of the guide cylinder, the water inlet is connected to the water inlet pipe, and the water inlet pipe is provided with a water inlet pump, and the dissolved air water inlet is The air-water pipe is connected to the drain pipe, the air-dissolving water pipe is provided with a dissolved air pump, the bottom of the sludge hopper is provided with a sludge discharge port, and the sludge discharge port is provided with a sludge discharge port extending to the outside of the air flotation tank. Tube. The sludge concentration type air flotation device provided by the utility model can be used for the mud-water separation of high-concentration suspended matter wastewater.
Description
技术领域technical field
本实用新型涉及污水处理技术领域，特别涉及一种污泥浓缩型气浮装置。The utility model relates to the technical field of sewage treatment, in particular to a sludge concentration type air flotation device.
背景技术Background technique
气浮装置是在混合液中，通入大量密集的微气泡，使其与水中细微杂质相粘附，形成整体比重小于水的“气-固”絮体混合体，依靠浮力上浮至水面形成浮渣，然后由刮渣机将其刮除，从而达到去除水中悬浮杂质的目的。The air flotation device is to inject a large number of dense micro-bubbles into the mixed liquid to make them adhere to the fine impurities in the water to form a "gas-solid" floc mixture whose overall specific gravity is smaller than that of water, and rely on buoyancy to float to the water surface to form a floating The slag is then scraped off by the slag scraper, so as to achieve the purpose of removing suspended impurities in the water.
常规气浮装置包括池体、水泵、空气压缩机、压力溶气罐。水泵和空气压缩机连接压力溶气罐，溶气水管道一端与压力溶气罐连通的，另一端进入气浮池，气浮池底设有清水收集装置，气浮池上方设有刮板收集污泥。这种气浮池高度一般0.5-0.8m，产生的浮渣需要及时刮除，并且需要加入混凝剂、絮凝剂，以提高废水中悬浮物被微气泡捕捉的机会，这种设备一般用于SS1000-2000mg/L的低悬浮物废水。A conventional air flotation device includes a pool body, a water pump, an air compressor, and a pressure dissolved air tank. The water pump and air compressor are connected to the pressure dissolved air tank. One end of the dissolved air water pipeline is connected to the pressure dissolved air tank, and the other end enters the air flotation tank. A clear water collection device is installed at the bottom of the air flotation tank, and a scraper is installed above the air flotation tank to collect sludge. . The height of this kind of air flotation tank is generally 0.5-0.8m. The generated scum needs to be scraped off in time, and coagulants and flocculants need to be added to improve the chance of suspended solids in wastewater being captured by micro-bubbles. This equipment is generally used in SS1000 -2000mg/L low suspended matter wastewater.
用于高悬浮物废水，例如絮状污泥厌氧出水的泥水分离时，气泡利用率低需要通入大量的溶气水增加能耗，并且由于分离区较小，出水、溶气水的扰动容易破坏污泥层，使上浮的污泥重新回到水中，降低分离效果，而且加药会对厌氧污泥产生毒性。因此这种常规的气浮装置并不适用。本实用新型因此而来。For wastewater with high suspended solids, such as flocculent sludge anaerobic water separation, the low utilization rate of air bubbles requires a large amount of dissolved air water to increase energy consumption, and due to the small separation area, the disturbance of effluent and dissolved air water It is easy to destroy the sludge layer, so that the floating sludge returns to the water, reducing the separation effect, and the addition of chemicals will cause toxicity to anaerobic sludge. Therefore this conventional air flotation device is not applicable. Therefore the utility model comes.
实用新型内容Utility model content
本实用新型目的是提供一种污泥浓缩型气浮装置，其可用于含高浓度悬浮物废水的泥水分离。The purpose of the utility model is to provide a sludge concentration type air flotation device, which can be used for mud-water separation of wastewater containing high-concentration suspended matter.
基于上述问题，本实用新型提供的技术方案之一是：Based on the above problems, one of the technical solutions provided by the utility model is:
一种污泥浓缩型气浮装置，包括气浮池和导流筒，所述导流筒竖直设置在所述气浮池中心并由所述气浮池的底部向中部延伸，所述气浮池的顶部设有刮渣机和设置在所述刮渣机下方的污泥斗，所述气浮池底部设有排水口、进水口和溶气水入口，所述排水口设置在所述导流筒外，所述进水口和溶气水入口设置在所述导流筒的底部，所述进水口连接进水管，所述进水管上设有进水泵，所述溶气水入口经溶气水管连接至排水管，所述溶气水管上设有溶气泵，所述污泥斗的底部设有污泥排口，所述污泥排口设有延伸至所述气浮池外的排泥管。A sludge concentration type air flotation device, comprising an air flotation tank and a guide tube, the guide tube is vertically arranged at the center of the air flotation tank and extends from the bottom of the air flotation tank to the middle, and the top of the air flotation tank A slag scraper and a sludge hopper arranged under the slag scraper are provided. The bottom of the air flotation tank is provided with a drain, a water inlet, and a dissolved air water inlet. The drain is arranged outside the guide tube. The water inlet and the dissolved air water inlet are arranged at the bottom of the guide cylinder, the water inlet is connected to the water inlet pipe, and the water inlet pipe is provided with a water inlet pump, and the dissolved air water inlet is connected to the drainage pipe through the dissolved air water pipe. The dissolved air water pipe is provided with a dissolved air pump, and the bottom of the sludge hopper is provided with a sludge discharge port, and the sludge discharge port is provided with a sludge discharge pipe extending outside the air flotation tank.
在其中的一些实施方式中，所述气浮池的下部设有集水管，所述集水管呈环状且外壁上设有若干个穿孔，所述集水管套设在所述导流筒的外部，所述集水管的出水口连接至所述排水口。In some of the embodiments, the lower part of the air flotation tank is provided with a water collection pipe, the water collection pipe is annular and has several perforations on the outer wall, and the water collection pipe is sleeved on the outside of the guide tube, The water outlet of the water collecting pipe is connected to the drain.
在其中的一些实施方式中，所述气浮池的底部设有多个排渣口。In some of the embodiments, the bottom of the air flotation tank is provided with a plurality of slag outlets.
在其中的一些实施方式中，所述气浮池呈锥形。In some of the embodiments, the air flotation pool is conical.
在其中的一些实施方式中，所述气浮池的高度为2～3米。In some of the embodiments, the height of the air flotation pool is 2-3 meters.
基于上述问题，本实用新型提供的技术方案之二是：Based on the above problems, the second technical solution provided by the utility model is:
一种污泥浓缩型气浮装置，所述气浮装置设置在厌氧反应器内，包括气浮池和导流筒，所述导流筒竖直设置在所述气浮池中心并由所述气浮池的底部向中部延伸，所述气浮池底部设有排水口、进水口和溶气水入口，所述排水口设置在所述导流筒外并连接有排水管，所述进水口和溶气水入口设置在所述导流筒的底部，所述溶气水入口经溶气水管连接至所述排水管，所述溶气水管上设有溶气泵，所述气浮池分离出的污泥由顶部溢流返回厌氧反应器内。A sludge concentration type air flotation device, the air flotation device is arranged in an anaerobic reactor, including an air flotation tank and a guide tube, the guide tube is vertically arranged at the center of the air flotation tank and is controlled by the air The bottom of the floating pool extends to the middle. The bottom of the air flotation pool is provided with a drain, a water inlet and a dissolved air water inlet. The drain is arranged outside the guide tube and connected to a drain pipe. The water inlet and dissolved air The water inlet is arranged at the bottom of the guide tube, and the dissolved air water inlet is connected to the drain pipe through the dissolved air water pipe. The dissolved air water pipe is provided with a dissolved air pump, and the sludge separated from the air flotation tank is The top overflow is returned to the anaerobic reactor.
在其中的一些实施方式中，所述气浮池的下部设有集水管，所述集水管呈环状且外壁上设有若干个穿孔，所述集水管套设在所述导流筒的外部，所述集水管的出水口连接至所述排水口。In some of the embodiments, the lower part of the air flotation tank is provided with a water collection pipe, the water collection pipe is annular and has several perforations on the outer wall, and the water collection pipe is sleeved on the outside of the guide tube, The water outlet of the water collecting pipe is connected to the drain.
在其中的一些实施方式中，所述溶气泵吸入口经沼气管道连接至所述厌氧反应器的沼气排口，所述沼气管道上设有沼气存储装置。In some of the embodiments, the suction port of the dissolved air pump is connected to the biogas outlet of the anaerobic reactor through a biogas pipeline, and a biogas storage device is arranged on the biogas pipeline.
在其中的一些实施方式中，所述厌氧反应器内设有支架，所述气浮池固定在所述支架上。In some of the embodiments, a support is provided inside the anaerobic reactor, and the air flotation tank is fixed on the support.
与现有技术相比，本实用新型的优点是：Compared with the prior art, the utility model has the advantages of:
1.采用本实用新型的技术方案，气浮池高度为2-3m，可实现深层气浮，在气浮池的上部形成厚厚的污泥层，避免溶气无效释放，提高微气泡利用率；1. Adopting the technical scheme of the utility model, the height of the air flotation tank is 2-3m, which can realize deep air flotation, and form a thick sludge layer on the upper part of the air flotation tank, avoiding the ineffective release of dissolved air and improving the utilization rate of micro-bubbles;
2.采用本实用新型的技术方案，导流筒的外部为分离区，分离区大，废水从导流筒向圆周扩散进入分离区，避免对分离区及浮渣层产生扰动；2. Adopting the technical scheme of the utility model, the outside of the guide cylinder is a separation area, the separation area is large, and the waste water diffuses from the guide cylinder to the circumference into the separation area, so as to avoid disturbance to the separation area and the scum layer;
3.采用本实用新型的技术方案，气浮浓缩过程不投加药剂，不会影响浓缩后污泥的活性；3. By adopting the technical scheme of the utility model, no chemicals are added during the air flotation concentration process, and the activity of the concentrated sludge will not be affected;
4.采用本实用新型的技术方案，溶气水通过溶气泵制备，制取效率高，装置简单，省去了空压机、溶气罐系统，节省能耗与场地；4. Adopting the technical scheme of the utility model, the dissolved air water is prepared by the dissolved air pump, which has high production efficiency and simple device, and saves the air compressor and dissolved air tank system, saving energy consumption and space;
5.采用本实用新型的技术方案，在分离区采用环状集水管，可避免排水对浮渣层产生搅动，提高出水水质。5. Adopting the technical solution of the utility model, the ring-shaped water collecting pipe is adopted in the separation area, which can avoid the agitation of the scum layer by the drainage and improve the quality of the effluent.
附图说明Description of drawings
为了更清楚地说明本实用新型实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. The accompanying drawings in the following description are only some embodiments of the utility model. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.
图1为本实用新型一种污泥浓缩型气浮装置实施例1的结构示意图；Fig. 1 is the structural representation of embodiment 1 of a kind of sludge concentration type air flotation device of the present invention;
图2为本实用新型实施例2的结构示意图；Fig. 2 is the structural representation of the utility model embodiment 2;
其中：in:
1、气浮池；1-1、进水口；1-2、溶气水入口；1-3、排水口；1-4、排渣口；1. Air flotation tank; 1-1, water inlet; 1-2, dissolved air water inlet; 1-3, drain outlet; 1-4, slag discharge outlet;
2、导流筒；2. Guide tube;
3、刮渣机；3. Slag scraper;
4、污泥斗；4-1、排泥口；4. Sludge hopper; 4-1. Sludge outlet;
5、进水管；5. Water inlet pipe;
6、进水泵；6. Inlet pump;
7、溶气水管；7. Dissolved air water pipe;
8、溶气泵；8. Dissolved air pump;
9、集水管；9-1、穿孔；9. Water collecting pipe; 9-1. Perforation;
10、排泥管；10. Mud discharge pipe;
11、排水管；11. Drainage pipe;
12、厌氧反应器；12. Anaerobic reactor;
13、沼气存储装置；13. Biogas storage device;
14、沼气管道；14. Biogas pipeline;
15、支架。15. Bracket.
具体实施方式detailed description
以下结合具体实施例对上述方案做进一步说明。应理解，这些实施例是用于说明本实用新型而不限于限制本实用新型的范围。实施例中采用的实施条件可以根据具体厂家的条件做进一步调整，未注明的实施条件通常为常规实验中的条件。The above solution will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are used to illustrate the utility model and not limit the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not indicated are usually the conditions in routine experiments.
参见图1，为本实用新型实施例1的示意图，提供一种污泥浓缩型气浮装置，包括气浮池1和导流筒2，优选的，气浮池1呈锥形，气浮池1的高度为2～3米，导流筒2竖直设置在气浮池1中心并由气浮池1底部向中部延伸，气浮池1的顶部设有刮渣机3和设置在刮渣机3下方的污泥斗4，刮渣机3为现有技术，本实用新型在此不再赘述。Referring to Fig. 1, it is the schematic diagram of the utility model embodiment 1, provides a kind of sludge thickening type air flotation device, comprises air flotation pool 1 and guide tube 2, preferably, air flotation pool 1 is conical, and the height of air flotation pool 1 2 to 3 meters, the guide tube 2 is vertically arranged in the center of the air flotation pool 1 and extends from the bottom of the air flotation pool 1 to the middle, and the top of the air flotation pool 1 is equipped with a slag scraper 3 and sludge below the slag scraper 3 Bucket 4, slag scraper 3 are prior art, and the utility model is no longer described in detail here.
气浮池1的底部设有排水口1-3、进水口1-1和溶气水入口1-2，其中排水口1-3设置在导流筒2外，进水口1-1和溶气水入口1-2设置在导流筒2的底部，进水口1-1连接进水管5，进水管5上设有进水泵6，溶气水入口1-2经溶气水管7连接至排水管11，溶气水管7上设有溶气泵8，将气浮池1分离出的出水用于制备溶气水。溶气泵8为现有技术，其是一种气液混合泵，溶气泵8的吸入口可以利用负压吸入气体，并将气体充分混合并加压溶解于水中，形成溶气水。污泥斗4的底部设有污泥排口4-1，污泥排口4-1设有延伸至气浮池1外的排泥管10，排出的污泥用于回流或进入污泥处理系统。The bottom of the air flotation tank 1 is provided with a water outlet 1-3, a water inlet 1-1 and a dissolved air water inlet 1-2, wherein the water outlet 1-3 is arranged outside the guide tube 2, and the water inlet 1-1 and the dissolved air water The inlet 1-2 is set at the bottom of the guide tube 2, the water inlet 1-1 is connected to the water inlet pipe 5, and the water inlet pipe 5 is provided with a water inlet pump 6, and the dissolved air water inlet 1-2 is connected to the drain pipe 11 through the dissolved air water pipe 7 , The dissolved air water pipe 7 is provided with a dissolved air pump 8, and the effluent separated from the air flotation tank 1 is used to prepare dissolved air water. Dissolved air pump 8 is prior art, and it is a kind of gas-liquid mixing pump, and the suction port of dissolved air pump 8 can utilize negative pressure to inhale gas, and gas is fully mixed and pressurized and dissolved in water to form dissolved air water. The bottom of the sludge bucket 4 is provided with a sludge discharge port 4-1, and the sludge discharge port 4-1 is provided with a sludge discharge pipe 10 extending outside the air flotation tank 1, and the discharged sludge is used for backflow or entering the sludge treatment system .
为了进一步优化本实用新型的实施效果，避免排水对浮渣层的搅动，提高出水水质，在气浮池1的下部设有集水管9，该集水管9呈环状且外壁上设有若干个穿孔9-1，集水管9套设在导流管2的外部即位于分离区，集水管9的出水口连接至排水口1-3。In order to further optimize the implementation effect of the utility model, avoid the agitation of the drainage to the scum layer, and improve the water quality of the effluent, a water collection pipe 9 is provided at the bottom of the air flotation tank 1, and the water collection pipe 9 is ring-shaped and several perforations are provided on the outer wall 9-1, the water collecting pipe 9 is sleeved on the outside of the diversion pipe 2, that is, located in the separation area, and the water outlet of the water collecting pipe 9 is connected to the drain port 1-3.
为了便于排出气浮池1内比重较大的沉渣，在气浮池1的底部设有若干个排渣口1-4。In order to facilitate the discharge of relatively heavy sediment in the air flotation tank 1, several slag outlets 1-4 are provided at the bottom of the air flotation tank 1 .
参见图2，为本实用新型实施例2的结构示意图，在用于厌氧污泥分离时，还可以安装在厌氧反应器12内部，包括气浮池1和导流筒2，导流筒2竖直设置在气浮池1中心并由气浮池1的底部向中部延伸，气浮池1底部设有排水口1-3、进水口1-1和溶气水入口1-3，排水口1-3设置在导流筒2外并连接有排水管11，进水口1-1和溶气水入口1-3设置在导流筒2的底部，溶气水入口1-3经溶气水管7连接至排水管11，溶气水管7上设有溶气泵8，气浮池1分离出的污泥由顶部溢流返回厌氧反应器12内，省去了污泥回流系统与刮渣机。Referring to Fig. 2, it is a structural schematic diagram of Embodiment 2 of the present utility model. When used for anaerobic sludge separation, it can also be installed inside an anaerobic reactor 12, including an air flotation tank 1 and a guide tube 2, and the guide tube 2 Vertically arranged in the center of the air flotation pool 1 and extending from the bottom of the air flotation pool 1 to the middle, the bottom of the air flotation pool 1 is provided with a drain port 1-3, a water inlet 1-1, a dissolved air water inlet 1-3, and a drain port 1-3 It is arranged outside the guide tube 2 and is connected with a drain pipe 11. The water inlet 1-1 and the dissolved air water inlet 1-3 are arranged at the bottom of the guide tube 2, and the dissolved air water inlet 1-3 is connected to the The drain pipe 11 and the dissolved air water pipe 7 are provided with a dissolved air pump 8, and the sludge separated from the air flotation tank 1 overflows from the top and returns to the anaerobic reactor 12, eliminating the need for a sludge return system and a slag scraper.
为了进一步优化本实用新型的实施效果，避免排水对浮渣层的搅动，提高出水水质，在气浮池1的下部设有集水管9，该集水管9呈环状且外壁上设有若干个穿孔9-1，集水管9套设在导流管2的外部即位于分离区，集水管9的出水口连接至排水口1-3。In order to further optimize the implementation effect of the utility model, avoid the agitation of the drainage to the scum layer, and improve the water quality of the effluent, a water collection pipe 9 is provided at the bottom of the air flotation tank 1, and the water collection pipe 9 is ring-shaped and several perforations are provided on the outer wall 9-1, the water collecting pipe 9 is sleeved on the outside of the diversion pipe 2, that is, located in the separation area, and the water outlet of the water collecting pipe 9 is connected to the drain port 1-3.
为了进一步优化本实用新型的实施效果，可将厌氧反应器12产生的沼气用于制备溶气水，溶气泵8吸入口经沼气管道14连接至厌氧反应器12的沼气排口，沼气管道14上设有沼气存储装置13。In order to further optimize the implementation effect of the present utility model, the biogas produced by the anaerobic reactor 12 can be used to prepare dissolved gas water, and the suction port of the dissolved gas pump 8 is connected to the biogas outlet of the anaerobic reactor 12 through the biogas pipeline 14, and the biogas pipeline 14 is provided with a biogas storage device 13 .
本例中，在厌氧反应器12内设有支架15，气浮池1固定在支架15上。In this example, a support 15 is provided in the anaerobic reactor 12, and the air flotation tank 1 is fixed on the support 15.
上述实例只为说明本实用新型的技术构思及特点，其目的在于让熟悉此项技术的人员能够了解本实用新型的内容并据以实施，并不能以此限制本实用新型的保护范围。凡根据本实用新型精神实质所做的等效变换或修饰，都应涵盖在本实用新型的保护范围之内。The above examples are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to allow those familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model with this. All equivalent transformations or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.
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| CN109320033A (en) * | 2018-11-23 | 2019-02-12 | 泰州明锋资源再生科技有限公司 | Lifting/lowering type air floating structure applied to pickling Treatment of Sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109320033A (en) * | 2018-11-23 | 2019-02-12 | 泰州明锋资源再生科技有限公司 | Lifting/lowering type air floating structure applied to pickling Treatment of Sludge |
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