An integrated treatment method for heavy metal passivation and nutrient nitrogen and phosphorus recovery in livestock and poultry manure

A technology for livestock and poultry manure and heavy metals, which is applied in the field of agricultural resources and the environment, can solve the problems that heavy metals are difficult to detoxify, and the recovery of nutrients, nitrogen and phosphorus is difficult, and the effect of efficient recovery is achieved.

Active Publication Date: 2019-09-27
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems that heavy metals in livestock and poultry manure are difficult to be harmless and the recovery of nutrient nitrogen and phosphorus is difficult, the present invention provides an integrated treatment method for passivation of heavy metals in livestock and poultry manure and recovery of nutrient nitrogen and phosphorus

Method used

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  • An integrated treatment method for heavy metal passivation and nutrient nitrogen and phosphorus recovery in livestock and poultry manure

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Effect test

Embodiment 1

[0066] Control the solid content of livestock and poultry manure at 3%, adjust the pH value to 8, add helicase (5mg / L) to the storage tank, and react at a constant temperature of 30°C for 5h; then introduce water curtain ionization through the water inlet pump at 1m / h Irradiation treatment reactor, controlled irradiation amount 5kGy, irradiation time 2min, ionizing irradiation equipment selects electron accelerator as irradiation source (energy constant 0.5MeV, power 40kw, beam current 10mA); then introduce homogeneous pool, use 5mol / L NaOH solution to adjust the pH value to 8.

[0067] At a flow rate of 0.5m / h, the treated livestock and poultry manure is introduced into the micro-electrolysis reactor (bottom-mounted tube aeration device, aperture 30mm) to a volume ratio of 1:3, and the continuous process is carried out under the condition of a blast rate of 70L / min. Iron-carbon micro-electrolysis fluidized bed reaction (residence time 60min, iron-carbon ratio 1:1, solid-liqu...

Embodiment 2

[0074] Control the solid content of livestock and poultry manure at 50%, adjust the pH value to 7, add helicase (10mg / L) to the storage tank, and react at a constant temperature of 40°C for 10h; Ionizing radiation treatment reactor, controlled radiation amount 10kGy, radiation time 5min, ionizing radiation equipment selects electron accelerator as radiation source (constant energy 1.0MeV, power 100kw, beam current 15mA); 10mol / L citric acid adjusts the pH value to 4.

[0075] At a flow rate of 0.1m / h, the treated livestock and poultry manure is introduced into the micro-electrolysis reactor (bottom-mounted tube aeration device, aperture 40mm) to a volume ratio of 2:3, and the continuous process is carried out under the condition of a blast rate of 50L / min. Iron-carbon micro-electrolysis fluidized bed reaction (residence time 120min, iron-carbon ratio 2:1, solid-liquid ratio of iron-carbon filler to liquid 1:10), start the internal circulation system at regular intervals (contr...

Embodiment 3

[0082] Control the solid content of livestock and poultry manure at 25%, adjust the pH value to 6, add helicase (3mg / L) to the storage tank, and react at a constant temperature of 35°C for 2h; Ionizing radiation treatment reactor, controlled radiation amount 1kGy, radiation time 10min, ionizing radiation equipment selects electron accelerator as radiation source (constant energy 1.0MeV, power 100kw, beam current 20mA); 10mol / L NaOH solution to adjust the pH value to 8.

[0083] At a flow rate of 0.3m / h, the treated livestock and poultry manure is introduced into the micro-electrolysis reactor (bottom-mounted tube aeration device, aperture 20mm) to a volume ratio of 1:3, and the continuous process is carried out under the condition of a blast rate of 60L / min. Iron-carbon micro-electrolysis fluidized bed reaction (residence time 120min, iron-carbon ratio 1:1, solid-liquid ratio of iron-carbon filler to liquid 1:5), start the internal circulation system at regular intervals (cont...

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Abstract

The invention provides an integrated treatment method of heavy metal passivation and nutrient nitrogen and phosphorus recovery for domestic animal sewage. Heavy metal element passivation and activation and release of nutrients nitrogen and phosphorus are achieved by adopting an integration technology of ionizing irradiation / iron-carbon micro-electrolysis fluidized bed, and efficient recovery of the nutrients nitrogen and phosphorus is achieved by adopting an integration technology of disc tube reverse osmosis / struvite crystal / hydrated molten iron oxide-carrying hot carbon. The copper-zinc-lead-chromium passivation rate is greater than 90%, the nitrogen element recovery rate is greater than 90% and the phosphorus element recovery rate is greater than 95%.

Description

technical field [0001] The invention belongs to the technical field of agricultural resources and environment, and in particular relates to an integrated treatment method for passivation of heavy metals in livestock and poultry manure and recovery of nutrients, nitrogen and phosphorus. Background technique [0002] In recent years, with population growth and economic development, people's demand for meat, eggs, milk, livestock and poultry products has increased. However, the resource and environmental problems brought about by intensive farming of livestock and poultry manure have become increasingly prominent. With the development of aquaculture and feed industry, modern intensive aquaculture has undergone significant changes. Adding Cu, Zn, Fe, As and other trace elements in feed can improve feed utilization, reduce disease incidence, and improve animal growth performance And so on. Due to the limited absorption of trace elements by livestock and poultry, most of the hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C01B25/45C02F103/20C02F101/20C02F101/16
Inventor 张涛邓雅馨
Owner CHINA AGRI UNIV
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