Using chemicals in sludge and wastewater treatment is a fairly popular technology because it’s simple, easy to buy, and doesn’t need a complex treatment system. So what are the most popular and effective sludge treatment chemicals used today? Together with KS Boiler Technology Co., Ltd. to list the top 8 popular chemicals.
Learn about chemicals in sludge treatment
Chemicals in sludge treatment are chemicals studied to be added to sludge to separate water from liquid sludge. By flocculating suspended solids, and precipitation of dissolved matter…
The role of chemicals in sludge treatment
One of the most important steps in the sludge treatment process is the separation of water from the liquid sludge. To do that, it is necessary to coagulate suspended colloidal matter. Flocculates suspended solids, and precipitates dissolved substances to separate them from water.
During water separation, coagulants, flocculating agents, and precipitates are used to facilitate water separation. In many situations, water separation would not be possible without them.
Inorganic coagulants are usually Iron, Aluminum, Calcium or Magnesium based electrolytes. Precipitation chemicals have many types, often with sodium, potassium, calcium or magnesium bases.
Since the 1960s, polymeric compounds have been used in wastewater treatment and they are rapidly becoming an essential tool. Linear or branched polymers are most commonly used.
Mechanism of action of chemicals in sludge treatment
Low content sludge is mixed with various inorganic chemicals to aid in water removal. These chemicals with medium molecular weight are commonly used in this situation. The degree of chemical charge will depend on the type of sludge and varies widely, from a medium charge for sludge from a paper mill to a very high charge for municipal sludge.
The chemical mechanism used for slurry presses is based on the fact that slurries usually carry a negative charge. When the chemical cations are attracted towards the sludge mass. They gradually shrink into a coating that surrounds the mud while allowing water to drain. The medium-weight polymer molecules seem to be able to compress the sludge. Helps the water separation process easily take place on the filter, in the screw …
Some types of biological sludge such as activated sludge or sludge from anaerobic wastewater treatment systems are difficult to handle. In this case, inorganic compounds such as ferric chloride or lime are used to aid in the dehydration process.
Common types of sludge treatment chemicals
Using chemicals to treat sludge is one of the effective sludge treatment technologies.
There are many types of chemicals, from dry powders to solutions and emulsions, with different charge composition and degree of charge. As well as very different molecular weights. Each type of polymer has a different role in the wastewater and sludge treatment cycle. And each type of sludge has a corresponding chemical.
These are some types of sludge treatment chemicals commonly used in treatment technology.
1/ Chemical NaOH – Caustic soda 99%
NaOH is one of the common chemicals used to treat wastewater and sludge. Chemical NAOH is a chemical that is easily soluble in water, in glycerin, or in alcohol, sewage sludge. Most chemical stores sell NaOH chemicals.
Chemical NaOH 99 China – Caustic soda, also known as caustic soda, has many forms such as: NaOH 99 colorless opaque flakes – caustic soda. Granular NaOH – granular caustic soda, 50% saturated solution NaOH
Chemical NaOH is a chemical that is easily soluble in water, alcohol, and glycerin. But insoluble in ether and other non-polar solvents.
NaOH is widely used in a number of light industries, chemical industry and some industries such as metallurgy, medicine, textile, dyeing, etc.
2/ Hydrogen Peroxide H2O2
H2O2 is a strong oxidizing agent. Hydrogen Peroxide is also an effective and widely used wastewater treatment chemical.
- The melting point of this chemical is – 0.89 degrees C
- The boiling point is 80.2 degrees Celsius and the pressure of H2O2 is 47mmHg.
- This is a chemical used in wastewater treatment systems, industrial sludge, cleaning chemicals.
When in direct contact with this chemical, it is necessary to wear protective equipment to avoid the risks brought by chemicals. H2O2 when left for a long time it decomposes into water and oxygen. H2O2 is a strong oxidizing agent. In some cases H2O2 can reduce for example oxygen silver to metallic silver.
Ag2O + H2O2 = 2Ag + H2O+ O2 – H2O2 falls into the skin causing burns and itching, white skin. After washing the wound with water, the above phenomena disappeared.
3/ Anionic / cationic polymers
Using polymer to treat sludge is also one of the commonly used methods. When using polymer to treat sludge, it will dry the sludge because the sludge has inorganic properties, so an anionic flocculant of the polymer is required. If treating organic sludge, cationic polymers should be used.
The amount of polymer used to treat sewage sludge is very small, only need to use parts per thousand to be treated thoroughly and effectively.
4/ PAC . chemicals
PAC chemical has the chemical formula [Al2*Oh9nCl6-n]m, yellow color, powder form, has the effect of settling and treating wastewater such as aluminum alum and Polytetsu chemical. However, PAC chemicals are widely applied in many different fields: treatment of feed water, industrial wastewater, domestic wastewater and sludge in aquaculture & seafood processing.
The principle of PAC chemicals is to break the bonds between water molecules and substances in water to help water become clearer.
5/ Microtech sludge treatment technology
This unique combination is of microbiology MCT-E1 & MCT-E5, 2 leading preparations in sludge treatment combination. MCT-E1- is a collection of natural bacterial strains. Specialized high content reduces COD, BOD, TSS for multi-sector wastewater, reducing system load shock.
MCT-E5- is a highly active microbial population that accelerates the biological oxidation of persistent compounds. In order to reduce the volume of sludge in wastewater treatment systems, biogas tanks, ponds, reservoirs, etc.
Using a combination of MCT-E1 & MCT-E5 is the optimal and economical solution. The most effective to reduce COD, BOD, TSS & treat sludge effectively today.
6/ Chemical sludge treatment MICROBE-LIFT /SA
Effects of wastewater treatment chemicals Microbe – Lift/ SA
- Decompose organic sludge hữu
- Increases the ability to decompose difficult-to-decompose organic compounds
- Increased settling capacity.
AquaClean SA (Sludge – Away) are specially designed highly active microorganisms. To speed up biological oxidation of persistent organic matter in treatment systems, ponds, cellars and reservoirs.
AquaClean SA accelerates the biological oxidation of wastes. Significantly increases the ability to process biodegradable organic matter. These miracle boosters can be used in combination with AquaClean® . To improve the performance of the whole system in all types of processing.
This combination increases the biological oxidation rate of BOD, COD. And sludge accumulates as persistent substances, fats, hydrocarbons and fibers (it is designed to promote solids removal).
7/ Iron Sulfate (FeSO4)
Iron Sulfate is a blue, powder and crystalline salt compound of iron with the chemical formula FeSO4. Because it is a salt compound, FeSO4 is widely used in life. Such as wastewater treatment, as raw materials for fertilizer production, etc.
Example in water treatment: Iron Sulfate is used as a coagulant, redox agent. For the removal of phosphate in the water of municipal and industrial wastewater treatment plants.
8/ Waste sludge treatment chemicals Al2(SO4)3 – Aluminum Alum
Aluminum alum, also known as alum, has the chemical formula AM(SO4)2, exists in the form of crystals and is opaque white. Where, A is a cation and m is a trivalent metal ion such as aluminum.
Ammonium aluminum alum has the chemical formula Al2(SO4)3. 14H2O, exists as white crystals, easily soluble in water. Mainly used for domestic use (mainly used in well water, wastewater treatment). Or as a component of baking powder, used in electroplating, etc.
Potassium aluminum alum has the chemical formula KAl(SO4)2. 12H2O. Exist as octahedral crystals, transparent, colorless, slightly soluble in water. Only when heated to 200 degrees Celsius can the crystallization be lost.
Above are the chemicals used to treat sewage sludge and specialized wastewater. If you need detailed advice. Please contact the hotline of KS Boiler Technology Co., Ltd right away.