Sewage treatment, classic practical knowledge!

Often, my friends ask me which books to read in the field of water treatment. In fact, the knowledge points in the books are quite systematic, and not everything can be used. Therefore, if I read a book from beginning to end to learn, it may not be very efficient.

A better way is to make full use of fragmentation time. Today, we have prepared 5 very practical water treatment knowledge points, each of which is independent of each other. Everyone can combine their own targeted viewing and learning.

1. Several basic concepts in water treatment systems: TDS, SDI, LSI, KSP

TDS: Total dissolved solids (generally similar to mineralization)

SDI: The pollution index is an indicator that measures the pre-treatment effect of the system, with an SDI<6.7. For deep well water, the reverse osmosis device requires an inlet SDI<5.

LSI: Langelier Saturation Index, which measures the scaling tendency of reverse osmosis devices. If LSI=0, the system has no scaling or corrosion tendency; LSI>0, system tends to scale; LSI<0, the system has a tendency for corrosion.

For reverse osmosis systems, the LSI value is required to be no greater than 0. The LSI value of the system can be reduced by adding acid or by reducing the water recovery rate of the system.

Ksp: solubility equilibrium constant. The reverse osmosis device selectively penetrates the solvent and solute in the raw water, resulting in concentration on the concentrated water side due to the reduction of solvent. When the concentration product of dissolved solids on the concentrated water side is greater than the solubility equilibrium constant, crystallization and precipitation will occur, posing a threat to the reverse osmosis device. Increasing the solubility equilibrium constant of the system can be achieved by adding scale inhibitors, which can increase the solubility of dissolved solids.

2. How can the LSI index be effectively controlled?

The effective control of the system's LSI index can be achieved through the following aspects:

1) The system's LSI index can be reduced by reducing the system's water recovery rate.

2) The system LSI index can be reduced by adding acid.

3) The solubility of dissolved salts in the system can be increased by adding corresponding agents, such as TRISPE1000 scale inhibitor.

4) It is possible to reduce or pre remove easily structured ions in the water, such as softening the system inlet water through a softening column.

3. What are the pre-treatment equipment?

The pre-treatment equipment includes mechanical filters, fiber filters, activated carbon filters, precision filters, ultrafiltration, microfiltration, sodium ion softeners, iron and manganese removal filters, dosing devices, raw water tanks, and aeration tanks.

4. What are the pre desalination equipment?

The pre desalination equipment includes an electrodialysis device and a reverse osmosis device.

5. What are the deep desalination equipment available?

There are deep desalination equipment such as anion exchangers, cation exchangers, mixed ion exchangers, distillation units, and EDI units.

The above is what Hongjie Water brings to everyone about "sewage treatment, classic practical knowledge!" I hope it can help you!

Shenzhen Hongjie Water Technology Co., Ltd. is an integrated high-tech enterprise specializing in product research and development, production, sales, engineering design, installation and debugging, technical consulting, and sales of supporting materials in the fields of industrial water treatment and drinking water treatment. Our main products include the design, manufacturing, installation, debugging, and maintenance of water treatment equipment, including pure water equipment, ultra pure water equipment, reverse osmosis equipment, GMP purified water equipment, EDI deionized water equipment, domestic sewage equipment, industrial wastewater equipment, softened water equipment, and reclaimed water reuse equipment, all of which are integrated into an environmentally friendly high-tech manufacturer.