Method for processing organic wastewater

Abstract

This invention relates to a method for treating organic wastewater. The method comprises: treating in UASB reactor, returning the digestive liquid to the wastewater not subjected to UASB reactor treatment, mixing, and sending into UASB reactor for treatment. The method can prevent the unbalance of acidification-methanation process in UASB reactor, ensure stable operation of wastewater treatment in UASB reactor, effectively adjust hydraulic load of UASB reactor, and prevent short flow effect. The treated digestive liquid can dilute high-concentration organic wastewater, and reduce the impact of wide range change of organic matter content in wastewater to UASB reactor.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to an organic wastewater treatment method utilizing a UASB (Up-flow Anaerobic Sludge Blanket) reactor. Background technique [0002] Water resources are very important resources to ensure the development of people's life and production. The arbitrary discharge of waste water will pollute precious water resources, thereby damaging people's health and hindering the development of social production. Effective treatment and rational utilization of high-concentration organic wastewater can greatly reduce environmental pollution, effectively utilize resources, and achieve the dual purposes of treatment and energy development, which is conducive to the recycling of resources and the sustainable development of industries. Wastewater treatment technology can be divided into physical method, chemical method and biological method according to different operating principles, and biological metho...

AI Technical Summary

Problems solved by technology

However, due to the gradual application of wheat and other raw materials in alcohol and other industries, the problems in the wastewater treatment process have also emerged. The main problem is that the traditional process of anaerobic treatment often leads to inability to treat it. The main reason is that wheat and the original Raw materials for alcohol production are very different in composition. Compared with dried cassava and dried sweet potato, the crude protein and crude fat content of wheat is much higher than the above two raw materials, which directly leads to the lower pH value of wastewater from alcohol production. About 4.0, which is far lower than the fermentation pH value of methane bacteria (6.2-7.8), coupled with the organic acid produced by acid-producing bacteria, will lead to a lower pH value of wastewater in the reactor, which seriously inhibits the activity of methane bacteria and is harmful to organic Acid utilization is reduced, which in turn further exacerbates the drop in wastewater pH and the system shuts down entirely

[0004] There are still some deficiencies in the existing wastewater treatment process: First, the low-load process is adopted under low temperature conditions, and the mixing intensity in the sludge bed is too small to produce a short-flow effect, and the application load and gas production rate of the UASB reactor are limited

The second is the change of wastewater with different concentrations, especially high-concentration wastewater will impact the UASB reactor. When the pH is too low, it will cause the reactor to stop. In addition, the suspended matter in the wastewater will also affect the granulation of sludge, or reduce the reaction. The effective volume of the device, or even cause blockage

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