What factors should be considered in the regulation of buried sewage treatment

What factors should be considered in choosing sludge conditioner?

(1) The variety characteristics of conditioner. When selecting inorganic conditioner, iron salt should be used as much as possible; when using iron salt will bring many problems, aluminum salt should be considered. When using vacuum filter and plate and frame filter press to dehydrate sludge, inorganic conditioner can be considered. When using centrifugal dehydrator and belt filter press to dewater sludge, organic conditioner can be considered. When it is difficult to achieve the ideal conditioning effect by using inorganic or organic conditioners, it can be considered to combine inorganic and organic conditioners. For example, the combined use of lime and ferric chloride can not only adjust the pH value, but also increase the porosity of sludge and promote the separation of sludge and water.

(2) Sludge properties. For the sludge with high organic content, the more effective conditioner is cationic organic polymer conditioner. The higher the organic matter content is, the higher the polymerization degree of cationic organic polymer conditioner should be selected. For the sludge mainly composed of inorganic substances, anionic organic polymer conditioner can be considered. The different properties of sludge directly affect the conditioning effect: the sludge in the primary sedimentation tank is easier to be dewatered, while the scum and excess activated sludge are more difficult to be dewatered, and the dewatering performance of mixed sludge is between the two. Generally speaking, the more difficult to dewater the sludge, the larger the dosage of conditioning medicine, the smaller the sludge particles, which will lead to the increase of conditioner consumption. The high content of organic matter and alkalinity in sludge will also lead to the increase of conditioner dosage. In addition, the solid content of sludge also affects the dosage of conditioner. Generally, the higher the solid content of sludge is, the greater the dosage of conditioner is.

(3) Temperature. The temperature of sludge directly affects the hydrolysis of inorganic salt conditioner. When the temperature is low, the hydrolysis will slow down. If the temperature is lower than 10 ℃, the conditioning effect will be significantly worse, and the conditioning effect can be improved by appropriately extending the conditioning time. When the temperature is low in winter, attention should be paid to the insulation of sludge conveying system (the temperature of sludge discharged from the sewage treatment system is generally not less than 15 ℃), so as to reduce the heat loss in the process of sludge transportation. If necessary, the dissolution conditions can be improved by heating the dilution tank of organic polymer conditioner or appropriately extending the mixing and dissolving time and increasing the stirring intensity.

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