Efficient sludge dewatering flocculant

Abstract

The invention relates to an efficient sludge dewatering flocculant. The efficient sludge dewatering flocculant is prepared from a mixture A and a mixture B, wherein the mixture A is prepared from the following components in parts by weight: 100 parts of diatomite containing 1-5 percent of soil fungi, 10-30 parts of activated carbon, 20-50 parts of cement and 2-5 parts of organic flocculants; the mixture B is prepared from at least three of the following components in parts by weight: 16-32 parts of sodium thiosulfate, 16-32 parts of iron oxide, 48-96 parts of calcium sulfate, 32-80 parts of aluminum sulfate and 16-32 parts of alkali carbonate. After the efficient sludge dewatering flocculant is directly added in water containing sludge to be uniformly stirred, mechanical dewatering is carried out, and water content of the sludge can be lowered below 60 percent; the removed water can be discharged to reach standard without needing to be further treated; heavy metals in the sludge are fixed in the sludge and can not be absorbed by plant roots and disperse in soils and water; the dewatered sludge can serve as a fertilizer raw material, a fuel raw material and a building raw material without secondary pollution.

Description

technical field [0001] The invention relates to a dehydrating agent which can be used for high-efficiency dehydration treatment of urban domestic sludge, sludge from waterworks, industrial sludge and sludge from rivers, rivers and lakes. Background technique [0002] After the sludge has been concentrated, its water content is usually still above 94%, and it is fluid and has a large volume, so sludge dehydration is still required. Concentration is mainly to separate interstitial water in sludge, while dehydration is mainly to separate adsorbed water and capillary water in sludge. This part of water accounts for about 15-25% of the total water content in sludge. Sludge dewatering is one of the most expensive but extremely critical processes in sludge treatment. The performance of sludge dewatering is directly related to the quality of the entire sludge treatment system. [0003] Sludge dewatering technology is mainly divided into two categories: natural drying dehydration an...

AI Technical Summary

Problems solved by technology

At present, several better sludge treatment methods are: ① Fry the sludge to remove the water, and then use the solids as raw materials for fuel; the disadvantages of this method are: investing in a sludge treatment production line, It needs more than 80 million yuan, and the operating cost is extremely high. Based on the 10-year life of the equipment in the process, it takes 500,000 yuan to treat one ton of sludge, and the operating cost is about 180 yuan; ②Many countries use power stones to generate tail gas Dry the sludge and use solid matter as fuel raw materials. The disadvantages of this method are: large investment and high operating costs. It takes 100,000-120,000 yuan to process one ton of sludge, and the operating cost is about 200 yuan; ③The sludge is fermented to make fertilizer. The disadvantage of this method is that heavy metals such as mercury and zinc in the sludge are easily absorbed through plant roots, which will cause the heavy metal content of grain and vegetables to exceed the standard and cause harm to human health.

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