sodaigomi no syobun ha hituyou desu.

It is read:

そだいごみ の しょぶん は ひつよう です。
sodai gomi no shobun wa hitsuyou desu.

A few reading notes:

• 粗大ごみ = そだいごみ
• 処分 = しょぶん
• 必要 = ひつよう
• The particle は is written ha but pronounced wa here.

粗大ごみ means bulky garbage / oversized trash / large waste items.

It usually refers to things that are too big to be thrown away with normal household trash, such as:

• chairs
• mattresses
• shelves
• large appliances or furniture

The exact category depends on local trash rules, but the general idea is large items that need special disposal.

処分 means disposal, getting rid of something, or handling something appropriately.

In this sentence, it means the act of disposing of the bulky garbage properly.

Compared with 捨てる:

• 捨てる = to throw away
• 処分 = disposal / processing / getting rid of something, often in a more formal or administrative way

So 処分 sounds more formal and is very common in notices, rules, and official instructions.

The particle の links the two nouns.

So:

• 粗大ごみ = bulky garbage
• 処分 = disposal
• 粗大ごみの処分 = the disposal of bulky garbage

This is a very common Japanese pattern:

• A の B = B of A / A’s B

Examples:

• 車の修理 = repair of a car
• 日本語の勉強 = study of Japanese
• 粗大ごみの処分 = disposal of bulky garbage

は marks the topic of the sentence.

So the sentence is structured like:

• 粗大ごみの処分 = disposal of bulky garbage
• は = as for...
• 必要です = is necessary

So the whole sentence is basically:

As for the disposal of bulky garbage, it is necessary.

In more natural English, that becomes something like:

• Disposal of bulky garbage is necessary.
• Bulky garbage needs to be disposed of.

Using は makes 粗大ごみの処分 the topic being discussed.

Yes, 粗大ごみの処分が必要です is also possible.

The difference is small, but the nuance changes a bit:

• は: sets the topic, sometimes with a contrastive feel
• が: focuses more directly on what is necessary

So:

• 粗大ごみの処分は必要です
  = As for bulky garbage disposal, it is necessary
• 粗大ごみの処分が必要です
  = Bulky garbage disposal is necessary

In many situations, both are understandable.
The は version can sound like you are talking specifically about that issue as a topic, or contrasting it with something else.

必要 is a na-adjective (and also functions like a noun in some contexts).

Here, it means necessary.

So:

• 必要です = is necessary
• 必要な + noun = necessary + noun

Example:

• 必要です = it is necessary
• 必要な書類 = necessary documents

That is why you may also see:

• 処分は必要です = disposal is necessary
• 必要な処分 = necessary disposal

です makes the sentence polite.

So:

• 必要だ = plain / casual
• 必要です = polite

This kind of sentence is common in:

• notices
• announcements
• official explanations
• customer-facing writing

So 必要です is a natural choice here.

Yes, possibly.

Japanese often leaves out the subject when it is understood from context.

So depending on the situation, this sentence could imply:

• You need to dispose of bulky garbage.
• Disposal of bulky garbage is required.
• Bulky garbage disposal is necessary.

Japanese often prefers a more neutral, less direct wording, especially in formal notices.
Instead of explicitly saying you must do X, it may say X is necessary.

Yes, it is understandable and natural enough, especially in a formal or written context.

That said, depending on the exact intended meaning, Japanese might also say:

• 粗大ごみの処分が必要です。
• 粗大ごみを処分する必要があります。

The second one is especially common if the meaning is clearly:

You need to dispose of the bulky garbage.

So the original sentence is fine, but there are other natural ways to express a similar idea.

They are similar, but the structure is different.

粗大ごみの処分は必要です

• literally: Disposal of bulky garbage is necessary
• more noun-based
• a bit formal or abstract

粗大ごみを処分する必要があります

• literally: There is a need to dispose of bulky garbage
• more verb-based
• often feels more directly connected to an action someone must take

So if you are learning patterns:

• Noun は 必要です = X is necessary
• Verb dictionary form + 必要があります = need to do X

Both are possible.

Japanese can write this word as:

• ごみ
• ゴミ

In everyday writing, ゴミ is also very common.
In official writing, you may also see ごみ.

So:

• 粗大ごみ
• 粗大ゴミ

Both can appear, and both mean the same thing.

Normally, standard Japanese is written without spaces:

粗大ごみの処分は必要です。

The spaces here are probably added for learners to make the structure easier to see.

In real Japanese text, you would usually not write:

粗大ごみ　の　処分　は　必要　です。

You would write it as one continuous sentence.

Yes.

Japanese often avoids sounding too direct, especially in formal or public language.

So instead of saying:

• 粗大ごみを処分してください。
  = Please dispose of the bulky garbage.

it may say:

• 粗大ごみの処分は必要です。
  = Disposal of bulky garbage is necessary.

This sounds more neutral and formal. It states a requirement without directly ordering the listener.