Multi-process combined reinforced sludge carbon source recycling method

Abstract

The invention relates to a multi-process combined reinforced sludge carbon source recycling method, which comprises the following steps: mixing a calcium-magnesium alkaline agent with sludge, mechanically grinding, destroying a sludge floc structure and a microbial cell wall, fully dissolving out organic matters, forming precipitates by Ca < 2 + >, Mg < 2 + > and PO4 < 3-> generated by hydrolysis, and removing phosphorus from a subsequent liquid phase. A non-airtight stirring storage tank is used for carrying out anaerobic modification on the sludge, so that acid-producing bacteria become dominant bacteria of the anaerobic modified sludge and are mixed with the ground sludge to carry out anaerobic acid-producing fermentation, most of organic matters stay in a hydrolytic acidification stage, and simple and easily-degradable organic matters such as volatile fatty acid (VFA) are continuously accumulated. Performing solid-liquid separation on the fermented sludge, adding a deamination agent into supernate for deamination, recycling the supernate as a carbon source in a sewage biochemical pool, and further treating filter residues to be used as a baking-free brick raw material. The obtained carbon source is mainly composed of volatile fatty acid (VFA) and other simple and easily degradable organic matters, is an electron donor which is most easily utilized in the denitrification process, is high in denitrification rate, and can improve the treatment efficiency of a sewage biochemical section biological system.

Description

technical field [0001] The invention relates to a multi-process combined enhanced sludge carbon source recycling and utilization method, which belongs to the technical field of sludge resource disposal and utilization. Background technique [0002] The influent COD concentration of domestic sewage treatment plants in my country is low, the C / N in the sewage is low, and the denitrification process lacks carbon sources. In order to achieve the discharge of sewage up to the standard, sewage treatment plants usually use external carbon sources (such as methanol, acetic acid, glucose, etc.) to solve this problem, which not only increases the operating costs of sewage treatment plants, but also increases sludge production, and sludge treatment has always been environmentally friendly. Tough issues for the industry. [0003] The excess sludge produced by sewage treatment contains a large amount of organic matter, which can be used as a carbon source for sewage denitrification. How...

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Problems solved by technology

[0003] The residual sludge produced by sewage treatment contains a large amount of organic matter, which can be used as a carbon source for denitrification of sewage. However, the organic matter in the sludge has a complex structure and is difficult to be directly utilized by microorganisms. Some pretreatment measures are required to enhance the biodegradable organic matter. freed

At the same time, in the biological nitrogen and phosphorus removal system of sewage, denitrification and denitrification, phosphorus-accumulating bacteria release phosphorus, and anaerobic bacteria’s own metabolism all need to consume carbon sources. The type of carbon source has a direct impact on its biodegradability, and then will affect the rate of denitrification

[0004] At present, there are many studies on anaerobic hydrolysis and acidification of excess sludge, and they mainly focus on improving the biodegradability, gas production, and carbon source dissolution of sludge through pretreatment. The main treatment methods include thermal alkali treatment and hydrolysis. Acidification method, ultrasonic method, microwave radiation method, biological method, etc. Although these methods can destroy sludge flocs to a certain extent, and convert difficult-to-biodegradable macromolecular organic matter into easily biodegradable small-molecular organic matter, the obtained carbon The biochemical availability of the source is still not high, and the utilization rate of the sludge regeneration carbon source is low

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