Low-temperature cultivation algal-bacterial symbiotic granular sludge method

Abstract

The invention discloses a low-temperature cultivation algal-bacterial symbiotic granular sludge method. The method comprises the steps that activated sludge subjected to acclimation or mature aerobicgranular sludge is inoculated to a gas stripping type batch reactor, algae fluid is fed into the reactor, stuffy aeration is carried out for 3 days to 7 days after the algae fluid is fed, the reactorreceives light and aeration during the process of stuffy aeration without drainage, and nutrients are fed into the reactor every four hours to eight hours, and after stuffy aeration is finished, the reactor runs according to the process including low-speed water inlet, aeration, sedimentation and drainage with the cycle ranging from 4 hours to 8 hours; and the process mentioned above is carried out on the condition that the indoor temperature ranges from 9 DEG C to 15 DEG C, and when the inoculated sludge is the aerobic granular sludge, the reactor runs for 3 days to 10 days according to the cycle to generate green or brown algal-bacterial symbiotic granules. The algal-bacterial symbiotic granules cultivated with the low-temperature cultivation algal-bacterial symbiotic granular sludge method has the advantages of being capable of resisting the low-temperature environment, high in treatment efficiency, good in sedimentation performance and the like, and the method is an efficient, economic and environment-friendly sewage treatment strategy, and thereby having the good application prospect and great significance.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for cultivating bacteria and algae symbiotic granular sludge at low temperature. Background technique [0002] Compared with traditional activated sludge technology, aerobic granular sludge technology has shorter settling time and smaller footprint, and is an advanced sewage treatment strategy. At present, more than 70 sewage treatment plants in the world have adopted aerobic granular sludge technology to treat mainstream municipal sewage. However, the removal efficiency of this method for total nitrogen and total phosphorus still needs to be further improved, and the remaining sludge produced can be used as a resource. Low value. Especially at low temperatures, not only is it difficult to form granular sludge, but the treatment efficiency of the aerobic granular sludge system will also decrease. [0003] Bacteria-algae symbiosis system is a research hotspot i...

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Problems solved by technology

[0004] The growth of bacteria and algae is inhibited at low temperatures, so the two sewage treatment strategies, the aerobic granular sludge system and the bacteria-algae symbiosis system, are difficult to start quickly and operate stably at low temperatures, and this problem needs to be further solved

There has been a small amount of research on the cultivation of bacteria and algae symbiotic granular sludge. Although algae can be produced in activated sludge by providing light, the growth of algae is relatively slow at low temperatures, resulting in the formation of stable bacteria and algae particles. At present, there is still a lack of methods to quickly form stable bacterial and algal symbiotic granular sludge at low temperatures

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