Method of treating heavy metal industrial effluent with turf as adsorbent
A technology for industrial wastewater and adsorbents, which is applied in adsorption water/sewage treatment, water/sludge/sewage treatment, energy and wastewater treatment, etc. It can solve the need for sludge dewatering equipment, low industrial added value, and large footprint. problems, to achieve the effect of low requirements for equipment and adsorption conditions, low processing costs, and cost reduction
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Embodiment 1
[0043] Example 1 The continuous adsorption and precipitation process is used to treat heavy metal industrial wastewater containing Cd. The initial concentration of Cd = 1.12 mg L -1
[0044] The specific operation is as follows:
[0045] (1) For heavy metal wastewater from the factory, adjust the pH to 6 with soda lime. If there are many suspended particles and floating objects in the water, it needs to be settled or scum removed.
[0046] (2) As shown in Figure 1, add adsorbent 2.0kg adsorbent / 1 ton of waste water in reaction tank 1, under the condition that stirring speed is 30 rev / mins, in reaction tank, inject heavy metal waste water, waste water flow ( Q) is 5m 3 / h, the reaction pool volume (V) is 10m 3 , The average adsorption reaction time is 2.0h, the average adsorption reaction time (t) is determined by the flow rate (Q) and the volume of the adsorption reaction tank (V), t=V / Q, adjust the water flow rate and control the adsorption reaction time through the flow c...
Embodiment 2
[0049] Example 2 Pb-containing heavy metal wastewater, Pb initial concentration=82.8mg L -1 , the influent pH=7.0, the dosage of adsorbent is 0.5kg adsorbent / ton of waste water.
[0050] The difference from Example 1 is that the adsorption treatment process is carried out in two reaction pools of different sizes by means of multi-stage variable speed stirring, and excessive adsorbent is added. The volume of the first reaction pool is 5m 3 , Stirring speed range 90 rpm, fast stirring; the volume of the second reaction tank is 20m 3 , the stirring speed is 10 rpm; the solid-liquid separation between the adsorbent and water is realized in the sedimentation tank. The sedimentation tank adopts inclined plate sedimentation, and the sludge settles at the bottom of the sedimentation tank, and is returned to the adsorption reaction tank by the sludge pump for recycling. adsorbent until the adsorption capacity of the adsorbent is reached.
[0051] Treatment effect: Pb effluent concent...
Embodiment 3
[0052] Example 3 The batch-type adsorption-sedimentation process is used to treat Pb-containing heavy metal wastewater, and the initial concentration of Pb=2.07mg L -1 , influent pH=5.5, adsorbent dosage 1.0kg adsorbent / 1 ton of waste water.
[0053] The adsorption treatment process adopts the sedimentation method after variable speed stirring. As shown in Figure 2, the batch continuous adsorption reaction pools 5 and 6 are of the same size. For reaction tank 5, the variation range and time of stirring speed are 140 rpm, stirring rapidly for 2 min; stirring speed 40 rpm, stirring for 5 min; stirring speed 10 rpm, stirring for 30 min; and finally standing for precipitation for 2 hours. During the static sedimentation process of the first batch of continuous reaction tanks 5, the waste water is injected into the second batch of continuous reaction tanks 6. The adsorbent at the bottom of the batch continuous reaction tank 5 is returned by the sludge pump to the first and second ...
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Abstract
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