Industrial wastewater produces a large amount of sludge during the treatment process. The water content of the sludge is more than 90%, the volume is large, and the storage, transportation and utilization are difficult. The concentration of pollutants in the sludge is very high, and it is directly discharged without treatment. It will seriously pollute the rivers and lakes, so the dewatering treatment of sludge is an indispensable part of the industrial wastewater treatment process.
The automatic filter press produced by our factory is used as solid-liquid separation equipment. In 1977, it was successfully transferred to the dewatering of residual activated sludge in Shanghai Fifth Printing and Dyeing Factory. After several years of continuous development and gradual improvement, it has become a new type of sludge dewatering equipment for textile printing and dyeing, chemical, dye, metallurgy, mining, leather, paper, sugar, pharmaceutical and urban water supply and drainage industries.
This paper introduces the characteristics, structure, working process and principle of the automatic filter press, sludge dewatering process, summarizes its use in wastewater treatment in various industries, and enumerates some application examples.
1. Features 1. Operation automation can realize four automatic operations: automatic pressing of plate frame, automatic opening of plate frame, automatic unloading, automatic washing filter cloth, all operation steps can be automatically controlled and remotely operated, and the degree of automation is higher than that. Other domestic filter presses are high, which reduces labor intensity and improves operating conditions.
2. Dewatering effect is good. The filter chamber is equipped with a press diaphragm (rubber film). The rubber film is blown with compressed air to squeeze out the residual water in the sludge to achieve the effect of pressing the mud, so the moisture content of the cake is better. low.
The machine is used for sludge dewatering, which can remove 90% of the water content in the sludge. The original thin mud is pressed into a dry block cake after dehydration, and the volume is reduced by a thousand times. The mud cake is easy to transport and handle. (or recycling), the dewatering effect is better than the vacuum filter, centrifugal filter and other sludge dewatering equipment. The moisture content of the mud cake is also significantly lower than that of the ordinary filter press without the pressing diaphragm, generally reduced by about 10%.
The filtrate is very clear and its turbidity can reach the standard of drinking water.
3. Compared with the old filter press, the production capacity is large, the filtration pressure is fast, the filtration speed is fast, the auxiliary time is short, the filtration period is short, and the production efficiency is high. Compared with the Japanese advanced filter press with international advanced level, Its production capacity has reached the level of the Japanese automatic filter press.
4, a wide range of applications can successfully filter the solid phase particle size below 5 microns or particle size up to hundreds of microns, solid phase concentration is less than 1% or