Process method for recovering nitrogen and phosphorus composite nutrients from biogas slurry and purifying primary methane
A nutrient and biogas slurry technology, applied in chemical instruments and methods, nitrogen fertilizer, gas fuel, etc., can solve the problems of low utilization efficiency of compound nutrients, large amount of biogas slurry cannot be digested, large investment in biogas purification, etc., and achieve saving The effect of equipment investment, easy operation, and enhanced effect
Inactive Publication Date: 2011-04-27
QINGDAO TIANREN ENVIRONMENT
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Problems solved by technology
[0003] In order to solve the problems of low utilization efficiency of complex nutrients in the biogas slurry of existing large and medium-sized biogas projects, the large amount of biogas slurry cannot be digested, and the random discharge causes water quality reduction and large investment in biogas purification.
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[0014] The present invention is a process for recovery of nitrogen and phosphorus compound nutrients in biogas slurry and primary biogas purification, mainly including flocculant phosphorus accumulation, separation of phosphorus-containing solids, lime recovery and separation of residual phosphorus, physical stripping and deamination, chemical absorption of solid ammonia, exposure Gas purification biogas and other process steps, that is, after mixing the fermented biogas slurry and flocculant in the previous system, precipitation and separation to obtain phosphorus-containing solids, the supernatant is used to increase the pH of the lime and recover the remaining phosphorus nutrients; the lime supernatant is blown off by air , Dilute ammonium sulfate solution absorbs nitrogen nutrients in the biogas slurry to recover nitrogen nutrients, and obtain ammonium sulfate through centrifugation; the stripped biogas slurry is aerated to purify the biogas of the pre-fermentation system an...
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The invention relates to a process for recovering nitrogen and phosphorus composite nutrients from biogas slurry and purifying primary methane, mainly comprising the following steps: phosphorus is flocculated by flocculating agents, phosphoric solid matter is separated, remaining phosphorus is recovered by using lime and is separated, deamination is carried out by physical blowing, solid ammonia is adsorbed chemically, and methane is purified by aeration and the like; phosphoric solid fertilizer is obtained through precipitation separation after fermentation biogas slurry in a primary system is mixed with the flocculating agents, pH value of supernate is increased by lime adjustment and the remaining phosphorus nutrients are recovered; lime supernate is blown off by air, the nitrogen nutrients in the biogas slurry are recovered in the adsorption link of dilute ammonium sulfate solution, and ammonium sulfate is obtained through centrifugal separation; the methane is the primary fermentation system is purified and the pH value is back-adjusted through aeration of the blown-off biogas slurry, and then the methane returns to the fermentation system for usage.
Description
technical field [0001] The invention belongs to the supporting process of high-concentration organic waste treatment technology, and relates to a process method for recovering nitrogen and phosphorus compound nutrients in biogas slurry and purifying primary biogas by adopting a process combination of chemical flocculation method and physical stripping method. Background technique [0002] The treatment of high-concentration organic waste (livestock and poultry manure, organic waste, straw, etc.) by biogas fermentation technology will produce a large amount of biogas slurry, which is rich in nitrogen, phosphorus, potassium and other compound nutrients, which is a good liquid fertilizer. Due to the lack of economical and applicable treatment methods to utilize the biogas slurry, most of the biogas slurry is directly used for farmland application without any recycling treatment, and the utilization efficiency of compound nutrient fertilizers in the biogas slurry is low; and with...
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IPC IPC(8): C02F9/04C01C1/24C05C3/00C10L3/10C02F1/52C02F1/66C02F1/20
CPCY02E50/343Y02E50/30
Inventor 曹曼刘林陈萍高山
Owner QINGDAO TIANREN ENVIRONMENT