Near the centrifugal separator. Gao Zhouzhi was next to the control panel in the control room and saw a row of colors sprayed on the top of the panel. It's red, green, orange, yellow, blue, purple. There are buttons below. This is like a combination lock.
There is a plastic board next to the cabinet, and I see some chemicals written in order. Fe2O3, AgB written on plastic board
, Cu(OH)2, Fe2+, bromine water, I2.
Behind the centrifuge, you can see pools with different water outlets connected to them. Available in different colors. He thought back to which pollutants each color might correspond to.
Red: Cu2O (brick red), Fe2O3 (reddish brown), red phosphorus (reddish brown), liquid bromine deep red. Brown: Fe(OH)3 (reddish brown), Cu (purple red).
Orange: K2C
2O7 solution, bromine water.
Yellow: AgI (yellow); AgB
(light yellow); K2C
O4 (yellow); FeS2 (yellow); industrial concentrated hydrochloric acid (containing Fe3+); Fe3+ aqueous solution (yellow); long-standing KI solution (oxidized to I2).
Green: Cu2(OH)CO3; Fe2+ aqueous solution F2 (light yellow-green); Cl2 (yellow-green); Cl2 (yellow-green); C
2O3.
Blue: Cu(OH)2; aqueous solution of Cu2+; mixture of I2 and starch.
Purple:KM
O4 (purple black); I2 (purple black); mixture of Fe3+ and phenol.
Black: FeO, Fe3O4, FeS, CuS, Ag2S, PbS, M
O2, C powder, CuO.
White: Fe(OH)2, AgOH, etc.
Fe2O3, AgB written on plastic board
, Cu(OH)2, Fe2+, bromine water, I2. Corresponding to the order of spray colors, red, yellow, blue, green, orange, purple.
Start the control panel and press the buttons in this color order. A mechanism next to the sewage pool will activate, revealing a hidden grid. There is a starter key inside.
Pass by a pool with some floc suspended matter in it.
Gao Zhouzhi asked, "What are these suspended solids? How to remove them?"
Luo Shao said: "Micro suspended solids can be precipitated and removed by coagulation. The objects treated by chemical coagulation are mainly micro suspended solids and colloidal impurities in the water. Suspended solids and colloids with tiny particle sizes can be maintained in the water for a long time. It is in a dispersed and suspended state and will not naturally settle even if it is left standing. Add coagulant to the water to precipitate and remove it through chemical action."
Luo Shao added some coagulant, and the pollutants in the pool began to precipitate. After scraping and brushing, they were collected and transported to the laboratory. No solution elements were found.
"There are several types of coagulation. There is a repulsive force between colloidal particles with the same charge. The closer the distance, the greater the repulsive force. Colloidal particles cannot aggregate with each other and maintain a stable dispersion state for a long time. Polymer coagulants are dissolved in After being dissolved in water, it undergoes hydrolysis and polycondensation reactions to form a high molecular polymer with a linear structure. Adsorption and bridging are carried out between two distant colloidal particles, so that the particles gradually become larger and form a coarse floc visible to the naked eye. This is called flocculation. During its own settling process, the sediment can capture particles such as colloids in the water, causing the colloids to condense."
Neutralized experimental equipment. Gao Zhouzhi knew that acids and alkaline substances can react to produce water and salt, and some are precipitates or gases.
He looked at the introduction on the wall and neutralized it. For acidic or alkaline wastewater, recycling and comprehensive utilization should first be considered for harmless treatment. When the concentration of acid or alkali wastewater is high, for example, above 3% to 5%, the possibility of reuse and comprehensive utilization should be considered; when the concentration is not high, for example, below 3% to 5%, recycling and comprehensive utilization are economical. Only when it is of little significance should neutralization be considered. The chemicals used in neutralization treatment are called neutralizers. Neutralizing agents used in acidic wastewater treatment include lime, limestone, dolomite, soda, caustic soda, etc. Neutralizing agents used in alkaline wastewater treatment include hydrochloric acid and sulfuric acid. The methods used in neutralization treatment include neutralizing acidic wastewater and alkaline wastewater with each other, adding chemicals to neutralize acidic or alkaline wastewater, and filtering neutralization.
The solution elements make up acidic substances and are somewhat corrosive. Use acid-base neutralization to convert it into salt.
Gao Zhouzhi said, "The specific process is to convert the salt into insoluble salt and precipitate it. Then it is easy to collect."
Luo Shao said: "Convert into precipitated substances."
Next to the processing equipment, there are some small experimental equipment. They introduced the liquid into the experimental setup. Add alkaline substances to react with the liquid. Some red precipitate begins to form.
Adding a certain chemical substance to the wastewater causes it to react chemically with some of the dissolved substances to form insoluble salts or hydroxides that precipitate. This method is called chemical precipitation.
They experimented with chemical reactions using a variety of metals and decomposing new salts. Iron decomposes and decomposes the salts into oxidation-reduction reactions to generate iron salts and decomposed substances.
Acid made from decomposed elements reacts with alkaline substances to form decomposed salts. Using an electrolytic cell, an oxidation-reduction reaction occurs between the decomposed salt and iron to generate decomposed substances and iron salts. But the purity is very small. The antacid is surrounded by some protective layer, making it difficult for the reaction to proceed.
Look at the map in the middle of the treatment plant to find the electrolytic cell. Next to it is written its description:
The process in which an electrolyte solution undergoes an electrochemical reaction under the action of electric current is called electrolysis. The electrode connected to the negative pole of the power supply accepts electrons from the power supply and is called the cathode; the electrode connected to the positive pole of the power supply transfers electrons to the power supply and is called the anode. During the electrolysis process, the cathode releases electrons, causing the cations in the wastewater to gain electrons and be reduced; the anode receives electrons, causing the anions in the wastewater to lose electrons and be oxidized.
Use adsorption devices to remove some pollutants.
At the phase interface, the phenomenon that the concentration of substances automatically accumulates or enriches is called adsorption. Although adsorption can occur at different phase interfaces, in sewage treatment, the adsorption of solid material surfaces to the substances to be treated in sewage is mainly used.
The adsorption between the adsorbent and the adsorbate occurs through intermolecular attraction (van der Waals force), which is called physical adsorption. If a chemical interaction occurs between the adsorbent and the adsorbate to form chemical bonds and cause adsorption, it is called chemical adsorption.
Ferromagnetic substances are easily magnetized and can be removed directly by magnetic separation. Iron suspended solids, iron oxide, iron, cobalt, nickel and their alloys all fall into this category.
Yang Yuling said: "Now we need to make a self-assembly control board as soon as possible, install this self-assembly chip, and let it communicate with nearby self-assembly chips. However, this chip has a password set. You need to use the solution element to activate it. .”
Gao Zhouzhi said: "To make a circuit board, you also need to have solution elements? This is to do two things. How to make a circuit board? Are there laboratories and factories nearby?"
Luo Shao said: "We can only use the materials already available here. Let's see how to extract the materials needed for the circuit board."
