Multi-technology coupled livestock and poultry breeding wastewater treatment device

Abstract

The invention relates to a multi-technology coupled livestock and poultry breeding wastewater treatment device. The treatment device mainly comprises an anaerobic digestion system, a contact oxidationsystem and an anaerobic ammonia oxidation system which are connected in sequence. The contact oxidation system comprises at least one contact oxidation reactor of an evolutionary biological method. After suspended substances are removed through flocculation precipitation or air flotation, the livestock wastewater enters the anaerobic digestion system for anaerobic digestion treatment; after partof organic matters is removed, the wastewater enters the contact oxidation system for further removal of the organic matters, and part of ammonia nitrogen and nitrate nitrogen are removed at the sametime; and after that, the treated water enters the anaerobic ammonia oxidation system for denitrification treatment. The treated livestock and poultry breeding wastewater can reach national standardsfor livestock and poultry wastewater discharge.

Description

technical field [0001] The invention belongs to the field of harmless treatment of animal husbandry liquid waste, and in particular relates to a multi-technology coupling livestock and poultry breeding wastewater treatment device. Background technique [0002] Livestock and poultry breeding wastewater is the wastewater generated during the process of cleaning livestock manure in the process of livestock breeding. This wastewater contains a high concentration of organic matter, a certain concentration of suspended solids, a relatively high concentration of ammonia nitrogen, and a certain concentration of phosphate. Generally speaking, when the concentration of organic matter COD in wastewater is higher than 3000mg / l, and the biochemical property is strong (BOD / COD>0.3), anaerobic digestion should be used for treatment. The raw water COD of livestock and poultry wastewater is often higher than 5000mg / l, so anaerobic digestion should be used; Ammonia nitrogen is released d...

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Problems solved by technology

[0003] In the past, the technology used to treat high-ammonia-nitrogen wastewater was mainly the A / O method. This method is an anoxic / aerobic process, which consumes high energy, occupies a large area, and requires a large investment. More importantly, the A / O method still cannot achieve ammonia nitrogen. removal of

At present, the follow-up treatment of livestock and poultry wastewater often adopts the oxidation pond technology, that is, the wastewater is discharged into artificial ponds, and the organic matter and ammonia nitrogen in the livestock wastewater are gradually digested through evaporation and long-term natural degradation. However, the oxidation pond method cannot Basically remove organic matter and ammonia nitrogen, usually after dozens or even hundreds of days of natural degradation, the organic matter is still not lower than 1,000mg / l, and the ammonia nitrogen is still as high as 600mg / l or more

For the waste water treated by the oxidation pond, the country stipulates the final disposal of the combination of planting and breeding, that is, every 2 sows are equipped with 1 mu of farmland, which leads to a large demand for land for livestock and poultry production enterprises, and the method of combining planting and breeding has great impact on The impact of the land cannot yet be judged

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