问题 问答题 简答题

厌氧反应器UASB的常规分析项目有哪些,根据分析结果如何对工艺做出调整?

答案

参考答案:

PH值:6.8-7.5,可通过液碱计量泵P8281来进行调整;

COD:≤5000mg/l,较高时应查明原因:

①降低进水负荷,或通过D8253排放水稀释进水;

②适当增加D8222至一段好氧的跨管开度;

③如果厌氧性能继续恶化,可通过低负荷进水,出水进行打回流。

④增加各种营养盐的添加量;

⑤增加污泥回流量。

较低时:

①适当提高进水负荷,但应该考虑到上升速度<13.9m/day;

②关闭D8253排放水稀释进水;

③若MLSS高,可适当增加剩余污泥排放。

VAC:≤600mg/l,过高可投加NaHCO3、石灰乳以中和积累的酸,但过量的石灰乳能起杀菌作用,解决欠平衡的根本办法是查明失去平衡的原因(有机负荷过高、进水PH过低或过高;碱度过低、缓冲能力差;有毒物质抑制;反应温度急剧波动;池内有溶解氧及氧化剂存在等),有针对性地采取纠正措施。

M-ALK:≥1000mg/l,总碱度对稳定反应器的PH值具有缓冲作用,一般大于2-3倍左右的VAC,如果由于高碱度引起消化液PH值上升至7.8以上,可采取减小回流水量、降低进水PH值。

SS:≤500mg/l,产气量过大引起池内搅拌作用大;上流速度快;三相分离器效果不佳;污泥颗粒破碎导致沉淀性能差。应根据不同原因采取相应的处理方式。

阅读理解

One day, a farmer was walking along a road with his son Thomas. The father said, "Look! There's a horseshoe. Pick it up and put it in your bag." Thomas said, 'It isn't worth the trouble." His father said nothing but picked it up himself. When they got to a nearby town, they lad a rest. There the farmer sold the horseshoe and with the few pennies he bought some cherries.

The father and the son continued their way. The sun was well up in the sky, and there wasn't a house or even a tree where they could have a rest. Thomas felt too thirsty to walk on. At this time, his father dropped a cherry on the ground and Thomas picked it up quickly and ate it. After a while, his father dropped another cherry and once again, his son lost some time in picking it up and putting it in his mouth.

And so they went on. The old farmer dropped the cherries and the son picked them up. When Thomas had eaten up all the cherries, his father said to him, "My dear son, if you had bent down earlier to pick up that horseshoe. it would not have been necessary for you to bend so many times for the cherries. Always remember the lesson that anyone who does not worry about the little things will find that he cannot do the great things.

小题1:Who picked up the horseshoe at last?

A.Thomas.

B.The old father.

C.Both the father and the son.

D.Neither the father nor the son.小题2:The farmer bought _______ with the money after lie sold the horseshoe.

A.some food

B.some water

C.some cherries

D.some pennies小题3:When the son refused to pick up the horseshoe, the father _______.

A.felt very happy

B.didn't say anything

C.beat the son

D.became a little angry小题4:The father dropped the cherries one by one, because _______.

A.he wanted his son to eat them all

B.he wanted his son to do more exercise

C.lie wanted to teach his son a lesson

D.he wanted his son to pick them up小题5:From the story, we can learn that _______.

A.cherries are so delicious that most of is like to eat-them

B.a horseshoe is so expensive that it can bring us a lot of money

C.if the boy wants to eat cherries, he must pick up the horseshoe

D.if we want to do some great things, we should start with some small ones

选择题