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Preparation method of oil shale ash-based adsorbent and method for recovering nitrogen and phosphorus in biogas slurry

A technology of oil shale ash and adsorbent, which is applied in the field of solid waste resource utilization and biogas slurry treatment, which can solve the problems of environmental pollution, low utilization rate, and occupation of cultivated land, and achieve low investment, low cost, and reduced pollution load Effect

Active Publication Date: 2019-10-18
ENERGY & ENVIRONMENT RES INST OF HEILONGJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After oil shale is processed and utilized, whether it is used for dry distillation to make oil, or burned for heating or power generation, a large amount of waste oil shale ash will be produced, part of which is used for mine filling to produce building materials such as cement, bricks, and ceramsite In terms of low added value and low utilization rate, most of them are stacked in the open air, occupying cultivated land and polluting the environment

Method used

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  • Preparation method of oil shale ash-based adsorbent and method for recovering nitrogen and phosphorus in biogas slurry
  • Preparation method of oil shale ash-based adsorbent and method for recovering nitrogen and phosphorus in biogas slurry
  • Preparation method of oil shale ash-based adsorbent and method for recovering nitrogen and phosphorus in biogas slurry

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specific Embodiment approach 1

[0040] A preparation method of an oil shale ash-based adsorbent, comprising the steps of:

[0041] Step 1. Pretreatment of oil shale ash: Collect oil shale ash after dry distillation, crush and grind it, pass through a 200-mesh sieve, weigh a certain volume of hydrochloric acid with 1mol / L hydrochloric acid at a solid-to-liquid ratio of 1g: 10mL, and add Put it into a beaker filled with oil shale ash, seal the beaker with plastic wrap and place it in a shaking incubator at 35°C for 1 hour, then filter the mixture in the beaker to separate the solid from the liquid, and keep the separated hydrochloric acid for recycling. The solid part was washed with distilled water until no chloride ions were detected in the washing liquid, and the washed solid part was placed in a drying oven, dried at 100°C for 3 hours, and then cooled to room temperature to obtain pretreated oil shale ash;

[0042] Step 2. Quantification of silicon-aluminum components in oil shale ash: perform a fluorescen...

specific Embodiment approach 2

[0052] According to the method of specific embodiment one, the oil shale ash-based adsorbent is used to recover nitrogen and phosphorus in biogas slurry, comprising the following steps:

[0053] Step a, biogas slurry precipitation: take fresh biogas slurry, measure and record the pH of the biogas slurry and the initial concentration of nitrogen and phosphorus, settle at room temperature for 1 day, and absorb the supernatant;

[0054] Step b, biogas slurry sand filtration: pass the supernatant liquid into a sand filter for sand filtration, the filter material of the sand filter is quartz sand, and the quartz particle size is 0.4mm;

[0055] Step c, centrifugal filtration of biogas slurry: place the biogas slurry after sand filtration in a centrifuge, centrifuge at 4000 rad / min for 10 minutes, take the supernatant and filter it with a non-woven fabric with a pore size of 100 μm, and obtain the biogas slurry to be adsorbed after filtration;

[0056] Step d, recovery of nitrogen a...

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Abstract

The invention relates to a preparation method of an oil shale ash-based adsorbent and a method thereof for recycling nitrogen and phosphorus in biogas slurry, which belong to the fields of recycling of solid wastes and biogas slurry treatment. The invention provides a novel sustainable developing way combining high-value utilization of oil shale ash waste and treatment of biogas slurry. Waste oil shale is adopted as a raw material, an adsorbent skeleton is synthesized by regulating and controlling the content of silicon and aluminum in the raw material, and the calcium and magnesium salts are treated to obtain the oil shale ash-based adsorbent; and the biogas slurry is subjected to the treatment processes such as precipitation, sand filtering, centrifuging, filtering by nonwoven fabric, adsorption by the oil shale ash-based adsorbent, filtering by the nonwoven fabric, circular adsorption by the oil shale ash-based adsorbent and the like, so that an average removal rate of nitrogen in the biogas slurry can reach 85 percent or above, an average removal rate of phosphorus reaches 75 percent or above, and the concentration of nitrogen and phosphorus in the biogas slurry reaches the nitrogen and phosphorus emission standard in GB18596-2001 National livestock and poultry aquaculture water pollution emission standard.

Description

technical field [0001] The invention belongs to the field of solid waste resource utilization and biogas slurry treatment, and in particular relates to a preparation method of an oil shale ash-based adsorbent and a method for recovering nitrogen and phosphorus in biogas slurry. Background technique [0002] Biogas slurry is the residue after anaerobic fermentation, containing more pollutants, COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand) and suspended matter SS (Suspended Solids) are very high, especially The ammonia nitrogen content is too high, far exceeding the emission standards. The treatment of biogas slurry has become a common problem restricting the development of biogas engineering industry. At present, there are mainly three treatment methods for biogas slurry at home and abroad: (1) through aerobic treatment to reduce COD, denitrification and denitrification, and then discharge up to the standard after reducing nitrogen content, but the cost of eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F9/02C02F101/16
Inventor 陆佳刘伟王欣周闯范超苏小红郭广亮
Owner ENERGY & ENVIRONMENT RES INST OF HEILONGJIANG PROVINCE