Classification of sludge, how is sludge treatment classified?

A variety of chemicals can be used for sludge deep dewatering, and the following are the most common chemicals used for ordinary sludge dewatering:

Cationic polyacrylamide: This is a polymer flocculant, which can flocculate small particles in sludge into larger particles through adsorption and bridging, and improve the sedimentation performance and dewatering performance of sludge.

Polyaluminum chloride: This is an inorganic polymer coagulant, which can coagulate with impurities in the sludge to form an insoluble precipitate, so that the water in the sludge is separated.

Lime: Lime can neutralize with the acids in the sludge, adjust the pH value of the sludge, and promote the cohesion and settlement of the sludge.

Diatomaceous earth: Diatomaceous earth has the characteristics of porosity and high specific surface area, which can be used as a filter aid to improve the filtration performance and dewatering performance of sludge.

It should be noted that different kinds of agents are suitable for different sludge properties and treatment requirements, so it is necessary to choose the appropriate agent according to the specific situation in practical applications. For sludge with high organic matter, under the condition that lime is not allowed to be added in the process, it is necessary to customize the organic deep sludge dewatering agent, and adjust the corresponding process parameters to ensure the sludge treatment effect.

The purpose of sludge sorting is primarily to determine the best way to treat and dispose of gocks. In the sludge treatment process, sludge can usually be divided into the following categories according to the different sludge characteristics, characteristics and treatment mechanisms:

1.Domestic sludge: Sludge or organic pollutants from domestic sewage treatment plants, mainly due to activities such as cleaning, flooding, and flushing toilets.

2.Industrial sludge: Yuwen mainly comes from the sludge generated in some production processes, such as steel mills, pulp production plants and printing and dyeing factories.

3.Agricultural sludge: mainly from livestock and poultry breeding and composting of agricultural waste.

4.Fly ash from municipal solid waste incineration: ash produced by the incineration of a large amount of garbage, mainly including minerals and hydrochloride compounds.

5.Dust sludge: Construction powder and dust from factories and construction sites.

6.Other sludge years: including coal mine pit mouth sludge, smoke and dust, waste oil sludge, etc.

The nature of these sludges has different complexities and different treatment methods, and the selection of treatment technology depends on the sludge, type and purpose of use, some common treatment methods include: excavation treatment, traditional stabilization treatment, hot gasification treatment, incineration treatment and treatment of organic substances, inorganic substances, moisture and sensitivity.

The sludge produced by sewage treatment can be divided into two categories: organic sludge and inorganic sludge.

Organic sludge is based on organic matter as the main component, is the product of the treatment of organic wastewater in the shed, generally easy to corrode, fine particles, small specific gravity, high initial water content and not easy to dehydrate, easy to pipeline.

Inorganic sludge is based on inorganic matter as the main component, is the product of physical and chemical treatment of waste blind water, generally not easy to corrode, coarse particles, specific gravity, low initial water content and easy to dehydrate, but poor fluidity, not easy to pipeline.

Sludge treatment is a sewage treatment process

Classification and basic characteristics of sludge.

1.Classification of sludge.

According to the characteristics of sewage, it can be divided into domestic sewage sludge and industrial wastewater sludge.

According to the composition and characteristics of wastewater, it can be divided into organic sludge, inorganic sludge, hydrophilic sludge and hydrophobic sludge.

According to the different stages of sludge treatment, it can be divided into raw sludge, thickened sludge, digested sludge, dewatered sludge and dried sludge.

According to the sludge, it can be divided into screening slag, grit tank sludge, scum, primary sedimentation sludge, residual activated sludge, humus sludge and chemical sludge.

Primary sedimentation sludge: Yuanliang comes from the primary sedimentation tank, and its properties vary with the composition of the wastewater. The organic content is between 55 and 70.

Humus sludge: Sludge from a secondary sedimentation tank after the biofilm method.

Residual Activated Sludge: Sludge from the secondary sedimentation tank after the activated sludge process.

Digested sludge: refers to the orange and wide sludge produced by anaerobic digestion of raw sludge (including primary sedimentation sludge, humus sludge and residual activated sludge).

Chemical sludge: Huibei sludge produced by chemical methods such as coagulation and chemical sedimentation to treat wastewater. It is characterized by easy dehydration.

Sludge refers to the mixture of solid matter and microorganisms produced in the wastewater treatment process, and its main components are organic matter, inorganic salts and microorganisms. Sludge can be used in the following ways:1

Compression drying: After compression drying, the sludge can be made into solid sludge paste or granules for soil improvement, fertilizer production, etc. 2.

Pyrolysis treatment: The sludge is subjected to high-temperature pyrolysis treatment, and organic substances such as oil, gas and coke can be obtained for energy production. 3.

Anaerobic digestion: The sludge is put into an anaerobic digester for fermentation to produce swamp gas and organic fertilizer. 4.

Combustion treatment: The sludge is burned at high temperature to obtain energy and ash and other substances. 5.

Biotransformation: The use of microorganisms to biotransform sludge can be made into biofertilizers, enzymes and other products for use in agriculture and industry. 6.

Soil remediation: Using sludge as a soil amendment can improve soil fertility and water retention and promote plant growth. 7.

Building materials manufacturing: Mixing sludge with other raw molding materials can be made into bricks, wall panels and other building materials products. 8.

Sludge to landfill: Sludge is disposed of in landfills to reduce its volume and environmental impact. In short, sludge can be utilized in a variety of ways, which can achieve resource utilization and environmental benefits.

Summary. Hello dear, sludge can be hand-composted or mechanically composted. Composted sludge is a good soil amendment. However, the sludge with excessive heavy metal content should be carefully disposed of after dehydration, and it is generally necessary to landfill and seal it.

Hello dear, sludge can be hand-composted or mechanically composted. The composted sludge is a good soil amendment. However, for the sludge orange trap with excessive heavy metal content, it should be carefully disposed of after the dewatering place is vacant, and it is generally necessary to landfill and seal it.

Sludge treatment and final sludge disposal methods: mainly include thickening, digestion, dewatering, composting or domestic landfill. Concentration is either mechanical concentration or gravity concentration, and subsequent digestion is usually anaerobic medium-temperature digestion, that is, anaerobic technology.

The biogas produced by digestion can be used as energy for combustion or power generation, or for chemical products. The sludge produced by digestion is stable in nature and has fertilizer effect, and after dehydration, it reduces the accumulation of body base and hands into cake forming, and will also be conducive to transportation.

Summary. Hello, dear, glad to answer for you, sludge can be hand-composted or mechanically composted.

Hello, dear, glad to answer for you, sludge can be hand-composted or mechanically composted.

Hello, sludge lead can never be composted by hand or mechanically. Composted sludge is a good agent for soil improvement. However, the sludge with excessive heavy metal content should be disposed of carefully after dewatering, and it is generally necessary to landfill and seal it.

The classification of solid waste varies depending on the method. According to **, it can be roughly divided into production waste and domestic waste; According to the composition, it can be divided into organic waste and inorganic waste; According to the characteristics of pollution, it can be divided into general waste and hazardous waste.

According to the relevant delineation in the Solid Law, solid waste is usually divided into the following three categories.

1) Industrial solid waste refers to the waste residue, dust, sludge, waste debris, etc. generated in the production and processing process and circulation of various industrial production departments. Some writings separate mining solid waste from industrial solid waste, and the Solid Law still classifies mining solid waste as industrial solid waste.

2) Municipal solid waste, also known as municipal solid waste, mainly refers to the solid waste generated in the daily life of the city or in the activities that provide services for the daily life of the city, as well as the solid waste regarded as municipal solid waste by laws and administrative regulations.

3) Hazardous waste refers to the waste that is included in the national hazardous waste directory or identified as having hazardous characteristics according to the hazardous waste identification standards and identification methods stipulated by the state. Put simply, it is a waste that contains highly persistent elements, chemicals or compounds that are timely and potentially harmful to human health and the environment.

At present, rural solid waste has also received more and more attention, and can be listed alongside the above three types of waste to become a major category, including waste generated in the production process of agriculture and forestry production and livestock breeding, as well as domestic waste of rural residents.

Sewage sludge, oily sludge, etc.

Interstitial water refers to the water surrounded by large and small sludge particles, accounting for about 70% of the water in the sludge, it is not directly bound to the sludge, so it is easy to separate from the sludge, and this water can be significantly reduced by gravity concentration.

Capillary bound water refers to the water combined by capillary pressure on the contact surface of solid particles, or filled with water in the cracks of the solid particles themselves, accounting for about 20% of the water in the sludge, and the removal of such water needs to apply a force in the opposite direction to the surface tension of the capillary water, such as the centrifugal force of a centrifuge.

Surface adhesion water refers to the water that adheres to the surface of small particles of sludge, which is more difficult to separate than capillary bound water, and needs to be separated by electrolyte as a coagulant.

Internal water refers to the internal water of microbial cells, and the removal of internal water must destroy the cell structure, so it is difficult to use mechanical methods, and it can be converted into external water by means of heating or freezing, or it can be removed by microbial decomposition methods such as aerobic oxidation and anaerobic digestion.