Sediment combined treatment process

Abstract

The invention relates to a sediment combination treatment technology. The technology adopts a biological homogenization, grading screening, centrifuge dewatering and vertical modular press filtration combination process, and concretely comprises the following steps: allowing sediment to go through a biological homogenization reactor in order to eliminate black and stink substances in sediment, make sand grains in the sediment become yellow and enrich organic matters to sludge clay particles, carrying out a grading and screening process, separating and collecting the sand grains in the sediment according to different particle sizes, directly centrifuging and dewatering the screened sediment, pumping the centrifuged and dewatered sediment into a vertical modular press filtration device, carrying out advanced treatment to reduce the final water content of obtained sediment cakes to 30% or below, allowing a precipitation supernatant, a centrifuge supernatant and a press filtration filtrate to respectively go through pipelines and automatically flow into an integrated water treatment device, treating the precipitation supernatant, the centrifuge supernatant and the press filtration filtrate, and discharging treated liquids after standard reaching. Compared with the prior art, the technology provided by the invention has the advantages of small occupied area, low running cost, good press filtration effect, continuous 24 h running, and realization of wide recycling uses of treated sediment and sand grains.

Description

technical field [0001] The invention relates to a sludge treatment technology, in particular to a bottom sludge combined treatment process. Background technique [0002] With the rapid development of society, the pollution of rivers, lakes and other water bodies has been serious in the past 20 years, especially the serious accumulation of river sediment, which contains a large amount of polluting substances, especially those that cause disease (cancer) and destroy ecology. Persistent refractory organic matter, heavy metal ions seriously exceeding the standard, etc. These harmful substances will affect human health and damage the natural environment and ecosystem through the accumulation and expansion effect of the food chain. In addition, the key to solving the eutrophication of water bodies is still closely related to the sediment. Water body sediment pollution is an environmental problem worldwide. The increase in pollution is mainly caused by human factors. Pollutants e...

AI Technical Summary

Problems solved by technology

[0003] The conventional treatment process for river sediment in China is generally "sand removal + diaphragm plate and frame filter". This process is generally operated intermittently, with relatively low efficiency and a large footprint. During the operation, a large amount of conditioning is required. agent (usually lime and fly ash, based on dry mud calculation, the dosage of conditioner is about 10%), and the pH value of the filtrate is 10-13, which needs to be adjusted to neutrality by adding acid before it can be transported to the subsequent water treatment unit , because the added conditioner is alkaline, the pH value of the mud cake is too high, so it cannot be used for landscaping and building sintering, and can only be landfilled. After the conventional process, the river bottom mud, although the moisture content is reduced ( about 40% to 50%), but the solid content of the sediment increases, so in a sense, it is actually an incremental technology

In addition, the sand particles separated by the process have a pungent odor and need to be cleaned. The cleaning water is likely to cause secondary pollution, and the building use value is relatively low.

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