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Environment-friendly processing method and system of agricultural class-A sludge biochar fertilizer and environment-friendly rotary sludge dryer used in method and system

A processing method and technology of biochar, applied in the direction of water/sludge/sewage treatment, sludge treatment, fertilizer mixture, etc., can solve the problems of being unable to be absorbed and utilized by plants, losing biological properties, etc., to increase revenue and profit, improve Value and price, effect of improving drying efficiency

Pending Publication Date: 2019-04-05
柳建国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heavy metal organic matter is decomposed and melted into glass when the sludge is heated and carbonized, it loses its biological properties and cannot be absorbed and utilized by plants. However, the sludge biochar fertilizer made of sludge is a new type of fertilizer and there is no national standard. The allowable content exceeds the current national standard for agricultural grade A sludge fertilizer and cannot be used to grow edible crops on arable land

Method used

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  • Environment-friendly processing method and system of agricultural class-A sludge biochar fertilizer and environment-friendly rotary sludge dryer used in method and system
  • Environment-friendly processing method and system of agricultural class-A sludge biochar fertilizer and environment-friendly rotary sludge dryer used in method and system
  • Environment-friendly processing method and system of agricultural class-A sludge biochar fertilizer and environment-friendly rotary sludge dryer used in method and system

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Experimental program
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Effect test

Embodiment 1

[0060] see figure 1 , the environmental protection type processing method of agricultural grade A sludge biochar fertilizer of the present invention, comprises the steps:

[0061] 1) Firstly, the thin sludge with a water content of 98-99% produced by the domestic sewage treatment plant is added to the concentrated chemical for precipitation and concentration, and the concentrated sludge with a water content of 95-96% is obtained;

[0062] 2) High-pressure dehydration of concentrated sludge with a moisture content of 95-96% to obtain dewatered sludge with a moisture content of 48-52%;

[0063] 3) Add a certain amount of humic acid to the dewatered sludge with a moisture content of 48-52%, and use a biaxial forced sludge mixer to mix and dry it to obtain a semi-dried mixed sludge with a moisture content of 23-38%;

[0064] 4) Use an environment-friendly rotary sludge dryer to heat and dry the semi-dried mixed sludge with a moisture content of 23-38%:

[0065](1) The heating fu...

Embodiment 2

[0083] see figure 1 , the environment-friendly processing method of the agricultural grade A sludge biochar fertilizer of the present embodiment is different from the embodiment 1 in that: the thin sludge is pumped into the sludge concentration tank, and the concentrated medicament dosing machine is provided on the delivery pipeline 1. Quantitatively add aluminum ferric chloride concentration agent with a concentration of 5-10% through the metering pump and mix it. After mixing, it flows into the concentration tank for precipitation and concentration. The supernatant flows out from the outlet above the concentration tank into the sewer, and the sludge becomes concentrated sludge after concentration; 1 Add 5-10 kg aluminum ferric chloride concentrated agent to 1 ton of dewatered sludge.

[0084] The effect of using ferric aluminum chloride concentrated agent is better, and ferric aluminum chloride has a large specificity, which makes the sludge easy to precipitate quickly; othe...

Embodiment 3

[0086] see figure 1 , the environment-friendly processing method of agricultural grade A sludge biochar fertilizer of this embodiment is different from Embodiment 1 or Embodiment 2 in that: further, the concentrated sludge is dehydrated under high pressure by a sludge high-pressure dehydrator, concentrated The sludge is pumped from the bottom of the thickening tank into the sludge high-pressure dehydrator through the pipeline through the sludge pump, the feed pressure is 16-20 kg / cm2, the secondary pressing pressure is 65-110 kg / cm2, and the moisture content of the sludge after high-pressure dehydration It is very low, so that the microorganisms lose the environment for a large number of reproduction, so as to avoid the odor generated by the fermentation of dewatered sludge.

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Abstract

The invention discloses an environment-friendly processing method of agricultural class-A sludge biochar fertilizer, which includes: precipitating and concentrating dilute sludge from a domestic wastewater treatment plant to obtain concentrated sludge with water content of 95-96%; dewatering the concentrated sludge under high pressure to obtain dewatered sludge with water content of 48-52%, addingcertain humic acid, and mixing and drying with a double-shaft forced sludge stirrer to obtain semi-dried mixed sludge with water content of 23-38%; using an environment-friendly rotary sludge drier to heat and dry the semi-dried mixed sludge with water content of 23-38%; using an environment-friendly rotary sludge carbonizer to heat and carbonize the crushed dried sludge with water content of 7-10%; using a biochar humidifier to humidify sludge biochar, and mixing well to obtain the agricultural class-A sludge biochar fertilizer. The invention also discloses an environment-friendly processingsystem of agricultural class-A sludge biochar fertilizer, and an environment-friendly rotary sludge dryer used therein. Sludge treatment herein is environmentally friendly, economical and efficient.

Description

technical field [0001] The invention relates to a sludge resource treatment method of a domestic sewage treatment plant, which adopts an environment-friendly processing method, an environment-friendly processing system and equipment to prepare sludge biochar fertilizer that can be applied to arable land for planting edible crops. Background technique [0002] By the end of 2015, more than 4,000 domestic sewage treatment plants had been built in cities and counties across the country, and more than 40 million tons of sludge with a moisture content of 80% were produced annually. Most of the sludge was not properly treated, and many sewage treatment plants piled up sludge in the plant Drying, dumping everywhere after drying, the pollution problem caused by sludge has attracted the attention of the society. There are currently four sludge treatment technologies in the market, A, sludge anaerobic digestion treatment technology, the process is complicated, the treatment cycle is 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/13C02F11/143C10B53/00C05G3/04C05G3/80
CPCC10B53/00C02F11/12C02F11/121C02F11/14C05D9/00C05G3/80
Inventor 柳建国柳思佳
Owner 柳建国
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