Method for recycling sludge of secondary sedimentation tank of sewage plant to prepare shrimp and crab feed

Abstract

The invention discloses a method for recycling sludge of a secondary sedimentation tank of a sewage plant to prepare shrimp and crab feed, and belongs to the technical field of shrimp and crab feed preparation. The method comprises the following steps: recycling the sludge of the sewage plant, mixing with distillers' grains, brown sugar and algae, performing anaerobic fermentation aging treatment, stacking the fermented sludge, inoculating earthworms for cultivation, decomposing harmful components in the sludge, feeding loaches with the sludge and the earthworms to further purify the sludge, killing the loaches by using high-temperature steam, drying in air, crushing, and compounding with pumpkin, potatoes and the like, thereby obtaining the feed. The shrimp and crab feed prepared by using the method is low in grease content, fitness of shrimps and crabs is not affected, wastes can be sufficiently utilized, resources can be reasonably used, good controllability and simple operation can be achieved, and both the environment-friendly and ecological benefits and the social and economical benefits can be met.

Description

technical field [0001] The invention relates to a method for preparing shrimp and crab feed by recycling sludge from a secondary sedimentation tank of a sewage plant, and belongs to the technical field of shrimp and crab feed preparation. Background technique [0002] With the rapid development of the industrialization of river crabs, edge tiger shrimps, and Pipi shrimps, the corresponding feed industry has also formed a large-scale production. Lipids are the main source of energy and essential fatty acids for the normal growth and development of shrimp and crabs, and help the absorption of fat-soluble vitamins. Essential fatty acids, phospholipids and cholesterol in lipids have an important impact on the survival and growth of shrimp and crabs, and are closely related to life activities such as molting and reproduction. Fishmeal, shrimp shell powder, peanut meal, etc. are commonly used feed materials. After being crushed, these materials are used as the main raw materials ...

AI Technical Summary

Problems solved by technology

After entering the environment, the sludge without proper treatment will directly bring secondary pollution to the water body and the atmosphere, which not only reduces the effective treatment capacity of the sewage treatment system, but also poses a serious threat to the ecological environment and human activities.

The moisture content of the sludge is high, the moisture content of the undewatered sludge is greater than 90%, and the moisture content of the preliminary dewatered sludge is as high as 80%, resulting in high transportation costs, large storage areas, squeezed landfill storage capacity, and blocked landfill leachate pipes, etc. Problems; not only cause visual pollution, but also provide a place for the breeding of other harmful organisms; sludge piled in the open air emits odor and peculiar smell, exposed to the sun and wind, pollutant particles will cause air pollution; soaked in water, dissolved, polluted The pollutants flow into the river along with the sewage, which will pollute the surface water and enter the groundwater; contain heavy metals, which may pollute the land if not controlled