A method for preparing sediment covering material from water purification plant sludge as a resource

A covering material, a technology for water purification plants, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., and can solve problems such as high disposal costs, secondary pollution, reduction, etc. , to achieve the effect of moderate hydraulic conductivity, good adsorption effect and simple process

Active Publication Date: 2018-05-25
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dewatering technology of sludge water from water purification plants is relatively mature, but the disposal of dewatered sludge is facing challenges. At present, the dewatered cakes are often transported to landfill, but there are disadvantages such as high disposal costs and secondary pollution, and it does not meet the requirements. The policy of "energy saving, environmental protection and sustainable development" currently advocated by the state
[0005] At present, the main way of resource utilization of water purification plant sludge is to prepare ceramsite, brick, cement clinker, etc., but due to factors such as cost and scale, it is basically still in the stage of laboratory research and has not yet entered the stage of industrial application.
Sludge from water purification plants is mainly flocs formed after iron salt or aluminum salt flocculants absorb pollutants in water during the water purification process. It is rich in aluminum or iron and other compounds, has a high specific surface area, and generally has a positive charge. , so it has a good adsorption effect on phosphorus. It can be seen that it is feasible to reduce the release of phosphorus from the sediment by turning the sludge of the water purification plant into a covering material. However, relevant literature points out that there is a risk of releasing nitrogen and organic matter during the application process. The plant sludge is mainly composed of inorganic matter and less organic matter, so solving the problem of nitrogen release from water purification plant sludge is the key

Method used

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  • A method for preparing sediment covering material from water purification plant sludge as a resource
  • A method for preparing sediment covering material from water purification plant sludge as a resource
  • A method for preparing sediment covering material from water purification plant sludge as a resource

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Feasibility Study on Controlling the Release of Nitrogen and Phosphorus from Sediment by Sludge Covering in Water Purification Plant

[0029] (1) Test plan

[0030] The test was carried out in 10L, DN 200mm wide-mouth glass bottles; the weight of sediment in each bottle was about 1.39kg, and the thickness was about 5cm. The covering strength of the covering material is 2kg / m 2 (weight is 63g). The lake water is slowly added into the bottle along the bottle wall by using the siphon principle through the plastic hose, and the volume of the overlying water is about 8L.

[0031] There are 10 glass bottles in the test, which are divided into 5 groups, and each group has 2 parallel bottles, numbered 1-5#, among which, 1# is the control system, which is not covered with any materials; 2# is the sand covering system; 3# water purification plant Pollution coverage system; 4# phosphorus-locking agent coverage system; 5# zeolite coverage system.

[0032] The test sta...

Embodiment 2

[0039] Example 2 Determination of optimal conditions for sludge calcination in water purification plants

[0040] (1) Test plan

[0041] Air-dry, mechanically pulverize and mechanically sieve the sludge cake from the water purification plant to obtain particles with a particle size of 1-3mm; 3h to prepare sludge granules; ②Calcinate at 400℃ for different time (1h, 2h, 3h, 4h, 5h, 6h) to prepare sludge granules; weigh 2.0g of sludge granules, put them into 200mL , NH with an initial concentration of 30mg / L 4 Cl solution or an Erlenmeyer flask with an initial concentration of 2mg / L orthophosphate, at 25°C and 150r / min, shake at a constant temperature in a water bath, take a sample after reacting for 24 hours, test the concentration of ammonia nitrogen and orthophosphate in the sample respectively, and then calculate The amount of adsorption of ammonia nitrogen and orthophosphate by sludge particles.

[0042] According to the amount of ammonia nitrogen and orthophosphate adsor...

Embodiment 3

[0048] Example 3 Study on Influencing Factors of Sludge Granules on the Adsorption Effect of Ammonia Nitrogen and Orthophosphate

[0049] (1) Test plan

[0050] The sludge from the water purification plant was calcined at 400°C for 4 hours, and the sludge particles with a particle size of 1-3mm were obtained through mechanical crushing and mechanical screening; , the adsorption capacity of sludge particles to ammonia nitrogen and orthophosphate; and orthophosphate adsorption capacity; ③Respectively investigate the initial concentration of ammonia nitrogen at 5mg / L, 10mg / L, 15mg / L, 20mg / L, 25mg / L, 30mg / L, or the initial concentration of orthophosphate at 0.5mg / L, Under the conditions of 1mg / L, 2mg / L, 4mg / L, and 8mg / L, the adsorption capacity of ammonia nitrogen and orthophosphate by sludge particles; the solution volume is 200mL, the water temperature is 25°C, the rotation speed is 150r / min, and the water bath is oscillating at a constant temperature; When the influence of pH...

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Abstract

The invention discloses a method for preparing a sediment covering material by sludge recycling of a water treatment plant. The method comprises the following steps: (1) collecting sludge of the water treatment plant to prepare sludge cake; (2) calcining the sludge cake at 380-450 DEG C for 3.5-4.5 hours to prepare sludge briquettes; and (3) screening the sludge briquettes by mechanical grinding and mechanical oscillation to prepare sludge particles having sizes of 1-3.2mm, namely the sediment covering material. According to the method, the problem that sludge of the water treatment plant releases nitrogen and organic matters can be solved, the prepared sludge particle covering material can be used for effectively controlling release of phosphorous in the sediment and controlling release of partial nitrogen in the sediment, so that eutrophication of a water body can be controlled, and ammonia nitrogen and organic matters are not released to the water body; and meanwhile, a new way is provided to the sludge recycling of the water treatment plant, and the aim of changing waste into valuable is truly realized.

Description

technical field [0001] The invention belongs to the technical field of sludge resource treatment, and in particular relates to a method for preparing bottom mud covering material from sludge in a water purification plant. Background technique [0002] Eutrophication of water body is one of the important problems faced by the prevention and control of water pollution in the world today. With the development of industrialization and urbanization in our country, the eutrophication of water body tends to be serious. Nitrogen and phosphorus are the main limiting factors of water eutrophication, and phosphorus is generally considered to be the key limiting factor. Reducing the concentration of phosphorus in water can effectively inhibit water eutrophication. Sediment is the "source" and "sink" of phosphorus in the water body, and the release of phosphorus from the sediment is one of the main sources of phosphorus in the water body. Therefore, when exogenous phosphorus is effecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12C02F11/18C02F1/28C02F1/58C02F101/16
CPCC02F1/281C02F1/58C02F11/12C02F11/18C02F2101/105C02F2101/16C02F2303/06
Inventor 周真明杨志敏苑宝玲刘彤刘淑坡刘啟迪李飞廖晓斌
Owner HUAQIAO UNIVERSITY
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