What are the factors that affect the effect of sewage treatment coagulants-Ocpuritech-img

What are the factors that affect the effect of sewage treatment coagulants?

by:Ocpuritech     2021-04-07
What are the factors that affect the effect of sewage treatment coagulants? Author of the article: in the course of sewage treatment equipment, there are a number of factors affecting the coagulation wastewater treatment, and factors are diverse, there is a kind of main coagulant, concentration, dosage, time of coagulation Stirring condition, PH value, temperature and its changes, etc. The following editor will specifically introduce which factors will affect the coagulation effect of sewage treatment. 1. The type and amount of coagulant, and different humidity agents should be selected for different wastewater. The amount of coagulant greatly affects the effect of coagulation, and both excess and deficiency will lead to the dispersion and stability of the sol particles. Therefore, the optimal dosage should be determined through experiments. Generally speaking, the amount of inorganic coagulant is relatively high, often reaching hundreds to thousands of mg/L, while organic polymer coagulant is mainly used for coagulation aid. , The dosage is small, usually 1.10mg/L, the highest is not more than 25mg/L. 2. The influence of stirring and reaction time, after a certain amount of coagulant is fully dissolved, the colloid produced will be compared with the original in water After colloids and suspended solids come into contact, many tiny alum flowers are formed. This process is also called mixing. The mixing process requires the water flow to produce intense turbulence, so that the medicine and water can be fully mixed in a relatively fast time. The mixing time generally requires tens of seconds to 2 minutes. The mixing effect is generally accomplished by hydraulic or mechanical methods. 3. The influence of pH value and alkalinity, pH value has a great influence on coagulation operation, so when wastewater is coagulated, it is necessary to pay full attention to its effective pH range. Organic polymer coagulants have less strict restrictions on the pH value, but a small pH value has a greater impact on the coagulation aid effect. Inorganic coagulants are sensitive to the pH value of wastewater. Since the coagulant hydrolysis reaction continuously produces H+, to keep the hydrolysis reaction fully proceeding, the water must have sufficient alkalinity to neutralize H+, such as insufficient alkalinity, the pH of the water The value will decrease, and the hydrolysis reaction will be insufficient, which is unfavorable for the coagulation process. For example, when the hydrolysate of AI3+ is at a low pH value, more complexes with high charge and low degree of polymerization are produced. As the pH value increases, the proportion of complexes with low charge and high degree of polymerization increases. Therefore, the pH value must be controlled according to the specific treatment object. Generally, pH 6.0·8.5 is the most appropriate. When ferrous sulfate is used as a coagulant, the optimal pH value should be Inorganic or organic polymer coagulant , It is also less affected by pH value, so it is widely used. The above is the editor’s introduction to the factors that affect the coagulation effect of sewage treatment. When sewage is processed, some chemicals are usually added to improve the effect of sewage treatment. You can also understand whether the dosage of sewage treatment equipment determines water quality. It’s good or bad, know how to add medicine correctly.
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